How To Make An Interior Window Sill

How To Make A Window Sill

The following tutorial will show you how to build a window sill in a few simple stages using just basic materials and abilities. I’ll show you how to make window sills out of different materials and give you some design advice so that they match the rest of your decor. In our 1950s block house, the most straightforward and least expensive dramatic home repair was the installation of new window trim. I’ve been gradually replacing them and have now completed three more. Take a look at the video below to learn more about window sills, including how to create one and some creative options to consider.

I also utilize affiliate links; for example, as an Amazon associate, I get a commission on qualifying purchases made by you at no additional cost.

Awindow sill is the lowest piece oftrim, or the ledge that runs down the bottom of thewindow frame.

What is the proper distance between a window sill and a wall?

  1. More lingering effects are available at your discretion.
  2. Which design of window sill is the best or most widely used?
  3. Modern window sills, in my opinion, look their finest when they have squared ends.
  4. Craftsman window trim, such as ours, complements a broad range of architectural styles and is quite simple to install.
  5. Is it necessary to have an apron on my sill?
  6. The trim under the window sill is referred to as an apron, and it is entirely optional to have it.
  7. It also serves as a decorative element and aids in the definition of a window’s style.
  8. A tradesman with two different outfits: one without an apron and one with a basic apron made of moulding.
  9. The following materials are required:
  • Depending on the depth of your glass, 1 x 6″ or 1 x 8″ choice pine wood should be used. The most frequent size will be 1′′ x 6′′
  • Paint sprayer with a Super Finish Max finish
  • Super Finish Max paint bottle with an extra coat of paint
  • Paint, a miter saw, a jigsaw, and a jigsaw blade with a high TPI count are all required. This is my favorite type of construction adhesive. Sandpaper
  • A tape measure (this is my personal favorite)
  • A drop cloth
  • Face mask or respirator that fits over prescription glasses
  • Safety goggles that fit over prescription glasses

Step 1. Remove existing window sills.

Our house featured tile window sills, as well as a few wood window sills that were badly constructed. I attempted to chip the tile away but found it to be an impossible effort, so I simply laid my new tiles on top of them.

In order to remove old wood sills and trim, first cut the caulking seal with a box cutter and then pull them off with a hammer and chisel or a heavy duty flathead screwdriver to free them from their caulking.

Step 2. Measure the depth and width of each window.

If you’re working on many windows at the same time, it might be helpful to develop a list or diagram of each one. Items such as wall or tile trim that is in the way of adding an apron or affecting the size of your window sill should be looked for before moving forward with the project.

Step 3. Cut the window sill length with a miter saw.

What is the most appropriate material for a window sill? Always utilize the highest-quality wood available, which is designated as select grade. Knots should not be present in it, and you shouldn’t have to perform any sanding on it. When selecting your timber, always make sure it is not bent or warped before purchasing it. Even though a miter saw produces the cleanest and most accurate cut, you may have each board cut to the lengths you want at your local big box retailer. Choose the best side of the wood to use for the front of the board and mark the rear of the board to indicate which window it is intended to be used for.

Step 4. Cut the window sill ledge with a jigsaw.

Measure and mark the length of the sill that will be visible beyond the window frame and the window itself. My Craftsman style window sill extends 5″ beyond the window frame, as an illustration of this. Afterwards, measure and label the depth of the window sill; mine is 4 34 inches in depth. This leaves a 3/4-inch sill that hangs over the edge of my window frame. Then you’re ready to begin cutting your DIY window sill, assuming it will have a square end. If it will have rounded edges, you should start marking the rounded corners immediately.

It’s quite simple, but it does the job well!

Check to see how well each windowsill fits into its respective window.

If you need to trim the wood on your window sill, start with a tiny bit and work your way up to the full length.

Step 5. Lightly sand any edges or rough ends before painting.

I used a 220 grit sandpaper and my random orbital sander to complete the project. Make careful to clean everything well before painting to ensure that there is no sawdust left behind.

Step 6. Spray the paint when possible.

For this project, I utilized my Super Finish Max paint sprayer since I needed a smooth finish with no brush strokes or imperfections. In addition, I wanted to reduce time when painting. Particularly given that it has been around 100° outdoors here in Florida! The following are some of my favorite suggestions for utilizing a Super Finish Max paint sprayer. In my movie, you’ll see how I painted and learn some other techniques. On their website, you can find out more about HomeRight’s product line, including the Super Finish Max.

  • Place the window sills on boards over a drop cloth in a well-ventilated location and elevate them off the ground. I placed tiny slabs of wood beneath my sills to prevent paint from pooling around the edges and ruining the surface. Always do a test spray before beginning a painting project. Paint using a leisurely back and forth movement, moving the paint sprayer with your arms rather than your wrists
  • Run clean water through the Super Finish Max to rinse it, and then set it aside while you wait for the first coat to dry before continuing. As soon as the first coat has dried completely to the touch, replace the paint container on the wall, run a test spray to clean away any remaining water, then apply a second coat of paint.

Step 7. Install the sill into the window ledge.

Place the window sill in place by applying construction adhesive to the sill and pressing it into place. In order to provide extra surface area and support for the chipped off parts of my window frame, I used shims, although you shouldn’t have to do so. With the exception, of course, of those who have damaged tile sills like mine.haha. Place the window sill in the window, ensuring sure that it is completely flat. If your window is framed with wood, you can secure it with a few brad nails.

Because ours is made of block and concrete, the construction glue was all I need. If you’re going to include a window apron, do it now. Check out my Simple DIY Craftsman Window Trimproject to see how I created and added craftsman aprons to my windows as well as how I framed my windows with wood.

Step 8. Fill nail holes with wood filler, caulk the rest.

If you’ve added trim or used nails, fill in the nail holes with wood filler to make them seem better. Painter’s caulk should be used along the sill edges and beneath the sill. It’s really that simple. Here are the three different designs of simple window sills that I created. Do you recall what the atmosphere was like at my office before? Let me go out on a limb here and claim that this is a significant improvement! The Craftsman window ledge and trim are shown here. Now is a great time to pin this and share it with your Facebook friends!

  • The first is a straightforward apron beneath the ledge.
  • I had to nestle the piece into a spot that was only as broad as the window sill since the tile trim protruded from the other side of the window.
  • It turned out to be a good outcome, in my opinion.
  • a vast improvement over what was previously available, which consisted just of loose tile.
  • Due to the way the bathroom is laid out, I decided that a simple wall would be preferable to the tiling around the entire wall.
  • If so, continue on.
  • DIY Picture Ledge with a Rustic Modern Feel Why not decorate the outdoors with aDIY Window Box?

How to Install an Interior Window Sill

Submitted byRobert Robillard on Product and Tool Evaluations Look after it’s all said and done

How to Install a Window Sill

Window sills are not something that most people consider about, but they are an important aspect of the interior design and window trim. A properly installed window sill may give a room a completed, elegant appearance. A window sill is made up of two parts: the shelf, which is the base or bottom of the window, and the apron, which is the top of the window. In this case, the “stool” refers to the ornate window trim behind the shelf. Whether you are replacing trim, rebuilding, or just adding windowsills to plastered holes, the outcome may produce a personalised and completed effect.

Steps on How to Install an Interior Window Sill

  1. Make a 3/16″ or a 14″ reveal mark on the jambs of your windows
  2. Using a leftover piece of your window trim casing, place it against each window side and at the reveal mark. Measure and mark a reference line on the wall, one on either side of the window
  3. Calculate the overhang of your window sill “horn.” For an overhang, I normally use 3-4 inches. To account for your 34″ overhang on each side, measure the distance between two wall markings and add 1-1/2 inches to that measurement. This dimension represents the length of your window sill. Cut the window sill stool to the appropriate length. In order to get this effect, use a router to produce a 12 round over on the front edge and sides. sand away the mill marks left by the router bit
  4. Maintain the window sill’s position against the window and on your layout lines by pressing it against the window. Make a note on the window sash and the wall where the compass scribe will be used. To finish your lines, use a combination of speeds or speed squared. As a reminder, I frequently place a “X” in the sections where I will be cutting off
  5. Using a jigsaw, cut the stool along the lines that have been drawn
  6. Install the stool and make any required changes to ensure that the window sill is tightly connected to the window and the bordering walls. Finish nails in the size of 6d or 8d are used to secure the stool to the ledge. Install the side window trim on the side windows. Using 6d finishing nails, attach the window trim casings to the side jambs of the window. To ensure a tight union, drive nails up through the window sill and into the vertical casing.

How to Make Window Sills & Aprons – Home Improvement Woodworking

In a remodel where we were replacing windows, we decided to add window sills to the finished product to add a little more polish. We recently installed a new fireplace mantel, and we needed something that would compliment the character of the mantel. The fact that we were replacing the original windows presented an excellent opportunity to update the window trim detail. Window trim should be installed before window sills. In order to properly install a bigger board at the base of the window, the first step is to ensure that there is adequate space in the wall frame to accommodate the installation.

  1. The thickness of this wood is typically 3/4 inch.
  2. The following materials will be used for this project:– 3/4-inch pine for the side and top window jams;– 3/4-inch pine for the bottom window jams;– 3/4-inch pine for the bottom window jams Windowsills made of 1 1/4 inch poplar; window trim on the top and sides of the window.
  3. After the new windows have been fitted and the spray foam insulation has been reduced in thickness, we may begin measuring out the window sill board.
  4. It will extend approximately 3/4 of an inch beyond the width of the window trim once it has been put in its final position on the wall.
  5. Wood will be removed from the aperture to allow the window sill to fit into the opening and contact the new window, which will be the first cut made.
  6. The distance between the window and the front border of the drywall should be measured in various places.
  7. Fitting the window sill in place once you’ve cut it out will reveal a gap between the window sill and the window.

That was done on purpose to make it easier to scribe the horns onto the wall.

Set the distance between the two points using a compass and a sharp pencil to match the gap.

After you’ve finished trimming the horns, you should have a good fit at the window and against the walls.

Completely assemble and temporarily hold the window jamb in place by driving screws into the bottom of the window sill from underneath its edging.

Holding a piece of window trim in place, mark the outer edge as well as the front face of the window trim.

The next step is to form the edge profile of the window sill once it has been cut to the proper size.

You may purchase a router bit to generate a profile that is similar to this.

It fills up the space between the sill and the drywall and protects it from damage.

Find a piece of window trim or baseboard with a pleasing contour and use it.

The space above the window sill.

You will learn how to cut, glue, trim, and install the apron by watching this video.

We hope you find this information to be useful in your home renovation endeavor. If you have any questions, please let us know and we will gladly address them. All you have to do is leave a comment on the YouTube video.

Wooden Window Sill

First and foremost, best wishes for the year 2021! You will learn how to construct and install a wooden window sill in this post. It’s not at all difficult to understand. A few power tools are required, but apart from that, it is a rather straightforward DIY. I hope it is of assistance to you if you are considering building one. Of course, there are pre-fabricated window sills available for purchase. Unfortunately, they are all composed of synthetic materials, which is a major no-no for me because I prefer natural materials.

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It will, without a doubt, feel a hundred times nicer to the touch and will make the space seem significantly cozier.

⇩⇩ If you prefer a more visual presentation, be sure to check out the movie!

Step 1: Tools and Materials

To complete this task, the following tools will be required:

  • A circular saw, preferably one with a track, is required. The following tools: jig saw, random orbital sander (or a comparable sander), and clamps. Instruments for measuring and marking
  • A wood plane or coarse sandpaper can be used. Caulking gun
  • Hammer
  • Caulking compound

The following materials are required:

  • Wood: I used a board of ash that had been put together. This is content that is easily available in my neighborhood. It costs around 100€ per slab, is 31 mm thick, is free of flaws, and has previously been beautifully sanded. I only utilized about a quarter of the board, so it cost me around 15€ each sill. And it has one of the most beautiful colors and grains that I have ever seen. It’s excellent for a situation like this. Of course, a solid piece of timber might also be utilized, but this would most likely need the use of a jointer and a planer to accomplish. Plywood can also be used as a substitute. Caulking
  • Wood finish (in my instance, Osmo translucent Topoil)
  • And caulking.

Step 2: Measure and Cut

I took a measurement of the opening where the sill will be installed. I had managed to construct the walls in a rather straight line, so everything was quite near to square (nothing a bit of caulking could not hide). If the walls had been crooked, I would have had to build a template out of thin plywood or cardboard to guide me through the process. I used my track saw (which happens to be my favorite tool!) to create the straight cuts. The jig saw was used to cut the little squares at the ends of the rope.

As a result, I used a circular saw for the most of the material and just used my jig saw to finish cutting the final piece of material.

I did a good job of cutting the sills precisely.

It is still capable of easily expanding in a tangential direction.

Step 3: Adding the Chamfer

I’m not sure if this is an absolutely necessary step. It is likely that if you have done any welding in the past, you are aware of the fact that it is a good idea to chamfer both edges before welding them. As a result, the weld is significantly stronger and more attractive. Why not try it out on a window sill and see how it goes. The chamfer was created with the use of a wood plane. If you don’t have access to one, coarse sandpaper on a sturdy sanding block should suffice in this situation. I believe it was successful because the finished outcome was rather pleasing.

Step 4: Round Over the Edges

This is entirely a matter of personal choice. I made the decision to round over the two corners that were too sharp. I did not provide a precise size for the roundover.

I simply used the first round thing that came to mind, which happened to be the inner circle of electrical tape. The jig saw was used to cut the majority of the material. The remaining material was removed with the use of an orbital sander and 100 grit sandpaper.

Step 5: Sand and Finish

Following that, I sanded all of the exposed surfaces with 100 grit and then 180 grit sandpaper. This resulted in a somewhat smooth surface. Burn scars from a circular saw were visible on the wall. Although I used a hand plane to remove them, coarser sandpaper would have worked just as well. For the last touch, I used Osmo translucent Topoil as a sealant. This is a high-quality treatment that brought out the natural beauty of the wood’s grain and colors beautifully.

Step 6: Install

Before applying the glue, it is a good idea to test it out one final time to ensure that there are no unpleasant surprises. I used some leftover heat-proof (although it is not need to be) glue from myWood Stove Podium project to assemble this shelf. I used a lot of thick beads to guarantee proper adherence, so be sure you do the same. It was necessary to install the sill and tap it with a hammer and a waste block (to avoid dents). All of the edges were caulked with silicone. In the end, I didn’t have the patience to tape everything, so I just pushed the caulk in with my soapy finger and hoped for the best.

Step 7: The End

As always, I hope you found this essay interesting and that you gained something from it. If you have any questions or comments, please feel free to express them in the comments section. As usual, best wishes for a lovely day! Andu Thanks for reading and watching, and please consider subscribing if you liked what you saw! Thanks!

1 Person Made This Project!

  • If you have just completed renovations or if you have moved into a new home, you may choose to replace one or more of the window sills. It’s possible that your present window sills are damaged, that you don’t like how they appear, or that they don’t complement your new interior design scheme. Because most houses have conventional window sills, it is not difficult to install new ones in their place. Several options are available, including window sills that easily snap into place over the existing ones, but you may even cover the existing window sills with tiles or natural stone. If you install new window sills, you may make them match the existing ones in all of your rooms. If you have a bay window, take a close look at what you can do with it because, in actuality, bay windows aren’t utilized very often. You may use it to create a cushioned seat as an extra seat. Window sills are available in a variety of designs and sizes. Do you want the window sill to be placed directly in front of the window, or do you want it to extend farther out from the wall than the window itself? Window sills are available in a variety of materials, including wood, stone, and marble, among others. Specified materials include: veneer strip, quick-drying filler, and construction adhesive – Silicon sealant- If wallpaper or paint are necessary for repairs, use silicone sealant. – a fine sandpaper swatch

Fit a new window sill on top of the old one

  • If you are unable or unable to remove the existing window sill, you may always install a new window sill that merely sits on top of the existing one as a temporary solution. These are frequently made with a scratch-resistant surface and are attached to the wall with construction glue.

Remove the old window sill

  • If you wish to remove the old window sill, you must first cut away the sealant edges with a utility knife before you can remove the window sill. Try to move the window sill away from the window frame after the sealant edges have been loosened. If this is too tough, try lifting the window sill from the bottom up
  • This should be easier.

Remove sealant and adhesive residues

  • After you’ve removed the window sill, you may use a filling knife to scrape away any residual sealant and adhesive from the area. Restoring the wall after removing the window sill is possible with filler or plaster
  • However, the wall may need to be repainted.

Horizontal check

  • In order to properly install the new window sill, you must first ensure that the underlying surface is smooth and horizontal. Make use of a spirit level to ensure that the surface is precisely level and horizontal. This will guarantee that the new window sill adheres well to the existing one.

Measure the width of the window frame

  • Measure the width of the window frame or wall, as well as the depth (A+B) of the window sill that you intend to install on the frame or wall. If you want the window sill to extend the whole length of the wall (C1+C2), use a try square to correctly measure the angle. Making a template out of heavy-duty cardboard is the best option at this point. This may be used to draw the angles on the window sill using a pencil. However, in actuality, the straight line of the window sill does not always coincide with the straight line of the wall.

Mark out the window sill

  • Make a mark on the new window sill to indicate the appropriate form and measurements. To draw a right-angled line, use a try square to sketch it out. Carefully lay the cardboard template on the window sill and trace the angle with a pencil onto the sill

Saw the window sill to size

  • Make use of a jigsaw with a fine-toothed blade to cut the wood. To avoid splintering of the top layer, place a strip of clear tape over the sawing line that you’ve drawn on the surface of the wood. Then cut the window sill to size and use masking tape to carefully cover the outer corners of the window sill as well as the veneer surface strip. If the veneer strip has an adhesive coating on it, you may use a clothes iron to secure it in place. When the adhesive is completely dry, carefully trim the veneer strip to the desired length using a sharp knife. After that, using fine sandpaper, smooth down the edge.

Fit the window sill

  • When the window sill is exactly aligned between the walls, apply construction glue to the surface on which it will be installed. Apply glue in equal-sized and evenly spaced patches with a sealant gun, as shown. Then, set the window sill on the surface and press it down hard to secure it in position. Using a spirit level, make sure that the window sill is horizontally aligned. Allow enough time for the glue to cure before filling in any gaps or seams with white acrylic sealer.

Fit a finishing strip

  • You might find that the window is damaged on the underside of the window frame, or you might want to create a classic look. If so, you can fit an appropriate finishing strip. Saw this to size and put it in place using construction glue

How to Replace an Interior Window Sill and Trim

Pets, plants, and the elements may all cause damage to window sills over time. Pets, plants, and the elements are particularly damaging. Window sill repair or replacement is a simple home improvement job that only requires a few hours and a few basic tools to complete. Our houses are beautiful, but they are not impenetrable. Over time, unsightly cracks, dents, and general wear and tear can accumulate, and window sills are particularly vulnerable to damage from dogs, plants, and the elements. A window sill on the inside of a window is the bottom section of the window that normally has a lip that extends over the trim molding.

  • Rot, water damage, sagging MDF or pressboard, pet damage, and deep claw marks are all possibilities.

Trim repair is really a practical and cost-effective option that is simple to install and takes only a few hours at the most. So, first and foremost, we have the crime. There are really three of these that are in this condition. All of this damage was caused by a nice pup that we rescued. After one year of working with him, he was diagnosed with acute separation anxiety, which appears to have subsided somewhat since then. This eyesore must be put to rest as soon as possible.

Tools and Materials

  • A hammer or prybar
  • A utility knife
  • A hand saw or a jig saw
  • Nails or a Brad Nailer (this is the highest-rated kit we use)
  • And a screwdriver. In order to match the other sills in your home, you will need a board and router or a millwork board. The use of a substance to prevent rot (you may or may not require this, although we have used it in the past)
  • Wood filler, a putty knife, a level, and caulk trimmer

Removing Window Casing and Sill

Isn’t it true that the first step is often the most frightening? Actually, the window itself is not joined to the internal sill in any way. The sill should be screwed into the frame at this point.

Step 1: Remove any side casing

Casing is the trim that surrounds the outsides of doors and windows on their exteriors. Casing is not always present on windows, as ours was simply joined to the drywall and caulked to conceal the joints. Because the casing rests on top of the sill and prevents the sill from sliding upward, you will almost certainly have to remove it. The photographs below show me removing the door casing, but the process is the same for everyone. When removing the casing, cut the caulk line on both sides, which conceals the drywall and window frame seals on both sides.

Remove any caulk that has accumulated around the sill as well.

Whenever you’re prying, make sure to utilize a brace against the wall to avoid denting the drywall.

(Photo No. 2) Remove any nails or staples that have gotten stuck in the caulk. (Photo number 34) If you are diligent, the casing may often be saved and reinstalled, although it may be necessary to replace it in some instances.

Step 2: Pry off the sill.

Slowly pry the sill up with an aprybar or a chisel to avoid damaging it. A hammer can also be useful. Maintain the integrity of the sill so that you may use it as a template when cutting the new sill. As a result, put it away for later.

Dealing with Rot

At this point, the most important thing to look out for is any rot that may be developing around the frame. It will be necessary to eliminate the rot, else it will continue to expand. If you do discover small mold or damaged wood, replace it or clean it well, then apply a treatment like this to keep it from deteriorating further. Rot necessitates the presence of two factors: a disease-causing bacterium or fungus, and water. Check to see that the source of the water that caused the rot has been identified and corrected.

Following the resolution of any difficulties that may have arisen, this is an excellent chance to seal any gaps that may have developed in order to achieve a more airtight seal.

Prior to installing the new sill, use a razor blade to cut away any surplus foam that has formed.

Step 3: Cutting The New Sill

We created a home for us here. Any adequate board may be transformed into a decent sill with a single pass over the router to create a bullnose edge. If you do not have access to a router, most window sill material may be bought at the millwork area of a home improvement store such as Home Depot, where it can be cut to size. Here’s another example that’s identical to ours. You will, however, need to trim it to fit your needs. Make a mark on the board with your template from the previous step and cut it out.

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Step 4: Attach new sill

Install the wood board into place with nails or brad nails, making sure to secure the board into the frame beneath it. I do not propose gluing because it is not necessary and will make any future repairs more difficult to do.

Step 5:Add Window Trim

If you have to remove the casing surrounding the window, here is the time to reinstall it around the window.

Step 6: Final Touches

This is both the simplest and most time-consuming stage in achieving professional results. You may be required to do any of the following, depending on your specific situation:

  • Fill and smooth all nail holes in wood sections with wood filler
  • Fix any flaws in the drywall with drywall compound. Caulk along the edges of all of the window trim and the window frame. Depending on how much trim is needed to match the existing trim in the house, prime and paint as needed.

In our situation, the window trim under the sill had some gouges and dog chewing damage, as well as other signs of wear and tear. Because the edge cuts on this specific piece are difficult, I decided to fill it.

Expert Tips

  1. I’ve used a lot of wood filler over the years, and this is my favorite brand. Using a little water, I thinned it down so that I could get into the tiny spaces
  2. For filling this sort of wood, I use these sponges because they have edges that are easy to manipulate and allow me to get into the ridges
  3. Try to find real wood goods rather than the pressboard-like pressboard that is commonly seen in new construction homes. Compared to the previous product, this one is far more user-friendly, less prone to breakage, and less problematic. Please see our step-by-step guide on Caulking Baseboards if you require further information on caulking.


  • Using the Most Simple Method, You Can Restore the Beauty of Your Baseboards
  • Building A Custom Closet
  • Making Simple Cabinets Look Expensive with Trim
  • How to Refinish and Refinish Kitchen Cabinets

Fortunately, now that it’s over, the dining room remodel will appear far more completed. When you have eye sores like these, it’s difficult to make a place feel inviting, intimate, and lovely. Interested in seeing our finished dining room makeover? Visit ourhome tour category, which includes photos from all of our previous before and after makeovers.

Frequently Asked Questions

What is the best way to fix flaking paint on a window sill? Remove any flaking paint with a scraper. Remove the paint using a paint remover or sand with 120 grit sandpaper until the surface is smooth. After vacuuming and wiping away any dust, apply two coats of durable paint to the surface. What causes window sills to rot? Rot necessitates the presence of two factors: a disease-causing bacterium or fungus, and water. A windowsill is a horizontal shelf where water can gather despite the fact that it is sloping.

  • What is the finest finish to use on window sills?
  • Cheap paint frequently gets slippery, causing objects placed on it to stick.
  • What is the approximate cost of replacing a window sill?
  • If you have to employ a contractor, you may expect to pay between $100 and $250 in additional labor costs.

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  • Remove the caulk line from both sides of the casing as well as the window sill itself by cutting it. To accomplish this, use a razor knife from top to bottom, being sure to get the whole caulk line if at all possible
  • Pull the casing from the drywall using a crowbar to free it from the wall. Whenever you’re prying, make sure to place a bracing against the wall to prevent drywall from being dented. Slowly pull the sill upwards with a prybar or chisel to avoid damaging it. A hammer can also be useful. Make every effort to maintain the sill intact so that you may use it as a template when cutting the new sill. If feasible, take measurements of the sill area and utilize the old sill as a template. Cut the new sill to the appropriate size. Because the walls are unlikely to be perfectly straight, it is necessary to dry fit multiple times. Install the wood board into position with nails or brad nails, making sure that it is secured into the framework underneath. Utilizing brad nails or nails to reattach or restore the side casing and trim that was previously removed
  • Finish up the finishing touches to the window. Wood filler should be used to fill and smooth out all nail holes, and walls should be patched if necessary. Caulk all of the window trim and frame edges to prevent water from seeping in. Depending on how much trim is needed to match the existing trim in the house, prime and paint as needed.
  • General Advice
  • I have a lot of experience with wood filler, and this is my favorite product. When I needed to get into the smallest spaces, I thinned it down with a little water. I really like these sponges for filling this sort of wood because they have edges that are easy to manipulate and that allow me to get into the ridges
  • Try to find real wood goods rather than the pressboard-like pressboard that is commonly seen in new construction homes. It is a much superior product that is less susceptible to damage and difficulties
  • Please see our step-by-step guide on Caulking Baseboards if you require further information on caulking.

How to install a window sill and trim

I’m a sucker for windows. I appreciate the amount of light they allow in and the perspective they give. Plain windows, which were present in every room of my house when I first moved here, are something I despise. Trimmed out windows are my favorite since it adds a lot of intricacy to a space and frames the view wonderfully. Unfortunately, in order to save time and money, most builders just sheetrock around the windows. However, if you, like me, want your windows to be more attractive, there is still hope.

  • Here are a few examples of my festively decorated windows.
  • lol I’m very aware that I’m being cheesy!
  • Alternatively, put on your Sunday best and add some casing to the remainder of the window frame.
  • It’s all a question of personal preference.

There are lots of ways to accomplish the same goal, this is my way.

Many people choose to skip this step and just place the new stool on top of the drywall, as seen below. I believe that spending the extra effort to remove the drywall layer will be worth it in the long run. Starting with a sharp utility knife, score the drywall in the corners and around the window sill to make it easier to remove. You want to keep the surrounding drywall on the sides as intact as possible, so use caution when digging it out with a crow bar. Once you’ve created a hole, you may begin to remove it in larger portions.

That’s the metal strip that runs down the edge of the table.

After that, sweep and vacuum up the remainder of the trash.

Step 2. Make a template.

You may try just measuring and cutting your stool/sill out, but I find that using a template allows me to obtain a much better fit. Just about anything may be used to create this item. Corrugated cardboard is my preferred material since it is thick enough to provide a decent fit while still being simple to cut to size. Paper is too fragile, and cutting a wood pattern would be too time-consuming. Making a template will assist you to obtain a good fit on walls that are not square. To establish how deep you want the sill to be, see your template.

Step 3.Cut out stool and install it.

I’ve seen MDF used, but it’s not something I’d advocate doing yourself. Wood is my preferred material since it can withstand a bit more damage. Save the MDF for the rest of the window trim, which will not be subjected to as much wear and tear. If you have a window in your bathroom that is left open during rainstorms or is exposed to water on a regular basis, I discovered that a Cellular Vinyl PVC molding is excellent. Lowe’s was where I found mine, but I’m sure it’s available at other retailers.

Cut out your pattern by tracing it onto the wood with a sharpie. It should be fitted first, and then the rough edges should be sanded. If you want to use PVC, I recommend adhering the sill to the wall using construction adhesive. If I’m working with wood, I glue and nail it together.

Step 4.Make and install apron.

Now we’re going to cover up that unsightly place where the corner bead used to be. The apron is the molding that may be found beneath the stool’s seat. You may construct this out of a variety of various types of molding, depending on what you think would look best. I frequently utilize base board trim that has been flipped upside down. I cut it at a 45-degree angle and then make a return to the beginning point. That’s the finest way to bring everything to a close.

Step 5.Finish Work

Fill in the nail holes, sand the surface, then paint it. Depending on your preference, you may add molding all the way around the window; there is no limit to how elaborate you can make it. Then take a step back and enjoy the view from your lovely window! The contributor’s bio is as follows:

Easy DIY Modern Window Casing

Guys, I finally done it! The casement of one of our windows with a sleek modern wood trim style was finally completed. It was far less expensive and simpler than I had anticipated, and I had anticipated it to be really straightforward in every way. Despite being a simple weekend project, this small DIY update has had the most influence on the appearance of our home. Allow me to conclude by saying that this project appears to be of such high quality that even Tano is swooning over it. For the past five years, replacing our windowsills and casing the windows has been a must-do item, but we have put it off because they are now a blank slate with the most horrible yellow tile sills.

  1. And not in the old-school cool pastel art deco and rattan Golden Girls style, but rather in a more modern one.
  2. So I came up with a lazy-alternative girl’s to taking out those tile sills, and it really turned out rather well.
  3. Please excuse the mess.
  4. It’s as if the window sills aren’t poor enough; the entire structure screams for some TLC.

The easiest way to replace old tile window sills

Simply covering up the dirty tile was the straightforward solution to the problem of replacing it. I realize it sounds disgusting and very half-assed, but apart from the fact that I fear the big mess that would result from taking them all down one by one, I honestly feel they help to keep some of the structural integrity of those windows and, consequently, the home. That may seem silly, but in the case of this home, I am shocked that it is still standing. It is truly amazing. The last thing I would want to do is mistakenly chip away at the wood frame casing that serves as the structural framing for those windows.

It’s a strange phenomenon, guy.

In addition, we have a large number of windows to deal with, therefore I wanted to find the simplest solution.

I’m just being completely honest here.

The next element of the equation proved to be the most difficult to figure out.

Designinga window casing

DIY is full with decisions at every turn. Finding the “perfect” design for your windows is a highly personal process, and if you’re anything like me, you’ll spend the rest of your life imagining all of the many possibilities. Daydreamers, come together. However, in order to spend as little money as possible on wood, I settled on a contemporary square frame with an expanded sill. I’m sure there’s a better way to put it, but for the time being, this will suffice. In most cases, the window sill extends horizontally to the edge of the trim casing, and I believe it would be odd if it didn’t.

Unless you chose a sill that is too shallow (like the original tiles).

It’s almost completely worthless.

But, before I get into too much detail, let me talk about the materials.

Supply list

  • 240 grit sandpaper sheet, adhesive caulk (paintable acrylic latex caulk with silicone)
  • Caulk gun
  • Preprimed timber
  • Miter saw
  • Hand saw/jigsaw
  • Nail gun
  • Wood filler

Pre-primed wood was utilized for all of the framing and construction of this 52′′x50′′ window: That’s all there is to it, haha.

Cut list

1 16 at 59′′ (the width of the window plus the width of the two edge trim pieces) 2 14 inches at 59 inches (the windowsill width for top and bottom trim) 2 14 @ 48′′ (I cut one board in half, else my window size would’ve necessitated the use of an extra board, which I didn’t want to do). No, not for an additional inch on each side)

Step-by-step windowsill replacement

1. Determine the depth of the sill and select a style from the options. I chose a simple wood box to frame the entire window, with the windowsill stretching horizontally from the box frame to the other end of the window. The design I selected needed the least amount of wood and had a contemporary appearance. Win-win! 2. Purchase the wood/trim as well as any additional supplies. 3. Measure the width of the windowsill and sketch the edge boxes that will allow it to sit flush against the wall. Cut them out with a jigsaw for a professional look.

  1. Despite the fact that the cuts were a touch harsh, everything was going to be covered with wood or caulk anyhow.
  2. After you’ve done a dry fit, cut the boxes as necessary so that it will sit comfortably on top of the existing sill.
  3. 5.
  4. This is what it looks like before the bottom frame is attached to the structure.
  5. This is the caulk that I used on the original sill of the house.
  6. For a more stable fit, nail it into the wall at various angles, and nail the horizontal overhang of the sill into the bottom frame of the bottom frame (this will be covered by the sides of the frame).
  7. At this point, I was so pleased with the outcome that I was ready to call it quits and leave things as they were.
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Lastly, cut the remaining parts (2 sides and the top) and attach the sides to the top with many nails.



Everything that comes together at a 90-degree angle should be caulked, according to the rule of thumb.

Cleaning caulk with baby wipes is a great idea, and you’ll thank me later.

Once you’ve painted, you’re finished!

Put some paint on them and call it a day.

Using frogtape painters tape to create *crisp* lines is recommended, as is the use of an angled brush to edge everything. I documented the majority of this process, as well as some of my missteps, on Instagram. For you, they are all rolled into a highlight reel of sorts as well.

The final product

She’s right in front of you. My favorite inexpensive home renovation project has been completed so far. Even though this one window only cost approximately $35 in timber, she appears to be worth a fortune. All of the other tools were already in my possession, which just goes to show how useful a lot of these items are. It’s possible that some of them (such as the wood filler and adhesive caulk) have been hanging around the house for several months (or even years?). Follow me on Instagram to stay up to date on the current project.

Mistakes I made

This project was less difficult than I anticipated, although as is inevitable, some mistakes were made. I am by no means a perfectionist, which is perhaps one of the reasons why I enjoy doing things myself so much! It’s nearly difficult to do everything just properly the first time you try. Fortunately, I have a slew of additional windows to practice on till I get it perfect. However, I’ve already provided the right technique in the preceding stages, but here’s what I did incorrectly in order for you to spot my mistakes: cutting the bottom frame before installing the sill– we cut everything first, including the bottom frame, before installing the sill.

  1. Wow, what a pleasant surprise!
  2. It’s a testimonial to the live and learn DIY lifestyle that I’ve chosen for myself!
  3. not sanding the unprimed edges– because they are raw wood, they will appear different when painted in comparison to the rest of the trim.
  4. That’s all there is to it.
  5. I was able to do all of this in around 3 hours.
  6. Save this for later.
  7. OTHER RELATED MATERIALS:10 key tools for Do It Yourself home upgrades This is the story of how I built my DIY Floating Deck for around $500.

How to Make Window Sills & Casings

Depending on the materials used and the quality of the workmanship, window components can be strictly utilitarian or can be used to make a fashion statement. The patterns range from sophisticated to rustic in style, and they are not difficult to make. If you have a few hand tools in your garage or shop, you may make your own window sill ideas and innovative window casing to save money while still achieving that unique aesthetic that can only be achieved by using your own hands.

Window Casing Is Basic

Window sills are a bare minimum. The majority of the time, they’re nothing more than a flat piece of wood that slots into the bottom of the window frame. Despite the fact that they often appear to be integrated into the frame, they actually rest flat on top of the framing. Moldings and jambs give the impression that they are a larger component than they actually are. Sills are frequently the first component of a window trim project. It is noted inSawdust 2 Stitches that when casings are joined to the sides, it provides the sill a completed appearance as well as covering the jamb.

Solid wood that is at least 3/4 inch thick should be used to construct the actual sill.

Use hardwood with stains and lacquer to get a high-end appearance. Using plain fir or pine and painting it to match the interior colors is a good way to save money. Try cedar or redwood for a more rustic appearance, then coat it with a clear oil sealer.

Window Sill Overhang Is Adjustable

The distance between the two vertical edges of the window opening should be measured and multiplied by six inches. Because of the extended length of the sill, you can notch the outside edges so that they protrude or overhang the wall on either side by 3 inches on either side. To begin, measure the width and depth of the frame on the inside of the door. In order to create the appearance of a little shelf, the sill should have a minimum overhang of 3/4 inch from the front edge of the window frame.

According to the findings of Addicted to Decorating, miter cuts are rarely required.

To accommodate the overhang on both sides, cut slots into the sill on both sides, which are frequently referred to as the “horns” of the sill.

Add ornate apron trim across the bottom of the sill, beneath the overhanging front edge of the sill, to make it more visually appealing.

Window Casing DIY

Window casings are the trim that runs around the sides and top of the window frame. Casings completely encircle or wrap around the window, covering the sides of the jambs and sealing the window from the outside. The bottom of the casing is designed to sit on top of the horn, with the outside corners of the sill overhanging. A lot of trim carpenters use baseboard or profiled trim to do this task, but you may construct it out of virtually any material you want. Most window casings are between 5/8 and 3/4 inch thick and at least 2-1/4 inches wide, but there’s no reason why you can’t make the casings thicker or wider if you want to give the window a more substantial appearance.

For lengthier horns on the sill – the overhanging section – the width of the casing should be somewhat less than the length of the horn in order for the bottom of the casing not to overhang the ends.

Romans and Victorian Styling

Make a basic casing by tearing timber to the necessary width and stacking it together. If desired, use a router to create a contoured edge on the piece. Bullnose edging looks particularly good on hardwood floors. Outside, it’s just a plain circular shape with a few lines. When using a hand router, a round-over bit is recommended. The radius of the bit can range from 1/4 inch to 1/2 inch or even more in diameter. To keep the look balanced, choose a sill that is the right size for the thickness of the sill.

Make sure to do both sides for even more esthetic appeal.

In order to give the casing a Victorian look, insert a 3/8 inch flute bit into the router and cut vertical flutes or channels into the face of the casing.

If you don’t have the time to construct your own casing, you can simply use any off-the-shelf baseboard molding to complete the look. For the sake of consistency, some individuals put the same molding on all of their doors, baseboards, and windows throughout the house.

DIY Marble Window Sills — Lone Oak Design Co.

Do you have wooden inside window sills that are scuffed, worn, and maybe even flaking from the paint? If this is the case, and you’re one of the many individuals out there whose window sills have seen better days, we’ve come up with a gorgeous, sturdy, and surprisingly quick solution:

Marble window sills!

Not only does marble add a classic (and yet, totally modern) look to an interior window sill, but it’s also a very durable material, which is great if you have pets like we do who like to stand on them when they participate in neighborhood watch, or if your sills are prone to collecting condensation from the window on cold days, or if your pets (or kids, no judgement) have gnawed on them a little.

It’s also a lovely update that adds some wow-factor now, as well as a magnificent and distinctive addition to your home that you can brag about later if you ever decide to put your property on the market again.

  • Carrara marble window sills are available in two lengths: 56″ and 74″. In order to acquire precise measurements, each piece should be the width of the window plus approximately 3″ to allow for sill wraparound on the window sides, or you may do what we did and use the existing window sills to get your exact measurements. Tape measure
  • Box/utility knife
  • Putty knife
  • Hammer
  • Needle nose pliers
  • 4.5″ corded circular saw with steel shoe and wet/dry diamond blade
  • Sharpie
  • Stable cutting surface that can get wet and dirty – we used sawhorses and scrap plywood
  • Irwin clamps
  • Water hose
  • Dremel+rotary tool bit– for finishing
  • Rags or cloths, caulk gun, marble glue, etc. Painting over paintable caulk (we picked white to help it blend in with the marble, although the most of it will be painted over)
  • Wall paint + paint brush– to touch up the existing wall paint
  • Painter’s tape
  • Wall paint + paint brush– to touch up the existing wall paint
  • Clear silicone– should be used to fill the seam between the window and the marble transparently.

So this is where things get a bit awkward, and I’m a little embarrassed for you to see how terrible we allowed one of our hardwood window sills become before we realized what we had done. ( This is by far the worst of them all, and it comes from the now-actual office that was formerly known as the dog room. but you just have to peel it off like a bandaid like everyone else. You can notice the most typical issues – peeling paint caused by dampness, dents and scratches caused by the nails of our security staff.

(You might measure and cut the marble without using a template, but if your sills are anything like ours, you’ll discover that nothing is actually square, no matter how square it appears.) We gently scored the caulk around the wooden sill where it touched the wall and the moulding beneath it using a box utility knife.

We used needle nose pliers to remove the nails from the wood, and then vacuumed and thoroughly cleaned the drywall ledge and window frame area to remove any dirt, dust, or loose drywall that had accumulated.

We named each sill as we removed it, which made it a lot easier to find items later on in the process.

Our pre-fabricated marble sill pieces feature two distinct edges: a modest, polished bevel on the long front edge, and a straight cut with a rougher-looking appearance on the back/window side that fits snugly against the back/window side of the window.

In addition to being deeper (at 6 inches) than the old sills (at 5.25″), our new sills have deeper front and side wraps/tabs than the old sills (by.75 inch), which is due to the fact that the existing window frame depth will not change and we have no intention of cutting our new sills lengthwise to make them shallower.

The marble sills were well supported through the middle to avoid any sagging or stress during the cutting process.

We used our 4.5″ circular saw and a very low stream from the water hose to keep the blade cool and wet while cutting the marble (bottom side facing up) on the lines that had been previously marked out. What you don’t need to do to obtain a clean cut is tape the cuts off using masking tape.

Tips for getting clean marble cuts

First, we tried cutting on/through painters tape. Unfortunately the tape lost its hold in the water and got caught up in the saw, and it didn’t really add much to the process in terms of keeping the cuts clean or preventing breakage. We discovered that the marble had a propensity to puff out a little at the end of the cut while it was departing the marble whenever it became thin enough to pass through. We cut the marble to its final length before cutting the notches in order for it to blow out in the scrap area.

When using a round blade to cut an inside corner cut, if we didn’t go slightly past our template line intersection (on only the back – the round blade means it’s where it needs to be on what will be the top side of the sill), or if the piece broke off before we got that close, there was sometimes a small burr left in the corner when the small marble piece came loose.

We prepared the marble by wiping it down with a dry towel, dry fitting it on the window ledge, and used the Dremel to make any minor modifications necessary to ensure that the marble fit firmly yet readily.

After that, we used our hands to apply excellent pressure to the top of the stone in order to make good contact.

For the spaces between the drywall and the marble, as well as the ornamental “support” moulding beneath each sill, we utilized paintable caulk that could be painted afterward.

When we were cleaning up the window frames, we discovered that the metal corner support, spray texturing, “drywall” and “wooden” window sills were all missing or non-existent, and that everything had been simply caulked together!

It’s so thin and transparent that it’s almost impossible to discern where the black window meets the marble, as you can see in the photographs below where the black glass meets the marble.

We want the stunning natural marble to take center stage rather than the caulk.

My favorite part is viewing the side-by-side comparison of the results!

And how no two patterns in our natural marble sills are precisely the same as each other.

Is this a hit or a miss for you?

Check out our guide on how to achieve amazing black windows on a budget.

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