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How to make a window seat with storage

By Ellie Reeves | 3rd November 2023 | 7 min read

Are you dreaming of a cosy nook where you can relax, soak up the natural daylight, and watch the world go by? If you’re not sure what to do with the empty space in your window bay, consider building a window seat with storage space – perfect for keeping spare cushions or blankets. In this article, we’ll guide you through the process of building a window seat in a bay window. Whether you're a seasoned DIY pro or a novice looking for a new project, carry on reading to find out how to make a bay window seat.

White wooden window seat with orange and grey cushions, featuring a black dog sitting on the seat.White wooden window seat with orange and grey cushions, featuring a black dog sitting on the seat.White wooden window seat with orange and grey cushions, featuring a black dog sitting on the seat.White wooden window seat with orange and grey cushions, featuring a black dog sitting on the seat.

Safety first

As you begin building your window seat, ensure that you have all the necessary safety gear within reach. This includes protective eyewear, gloves, and a dust mask. When using power tools, take extra caution and care. Always read the instructions and familiarise yourself with how they work before powering them up. Keep the work area clean and well-lit to avoid any accidents. If at any point you feel unsure or uncomfortable about a particular aspect of the project, seek assistance from a professional or someone with more experience.

Tools & materials you’ll need

Measuring up and creating the frame

Orange dotted square highlighting the space potential under a bay window for a window seat.Orange dotted square highlighting the space potential under a bay window for a window seat.Orange dotted square highlighting the space potential under a bay window for a window seat.Orange dotted square highlighting the space potential under a bay window for a window seat.

1. Clear the area beneath your window and measure the space

Mark out the height for your new window seat (we recommend 45cm as a comfortable sitting height).

Person wearing gloves holding a spirit level against a cream wall.Person wearing gloves holding a spirit level against a cream wall.Person wearing gloves holding a spirit level against a cream wall.Person wearing gloves holding a spirit level against a cream wall.

2. Mark out the height of your bench

Use a spirit level to draw a horizontal line all along the walls to mark where the top of the bench will be.

Person using an angle measurer to measure the angle of a corner.Person using an angle measurer to measure the angle of a corner.Person using an angle measurer to measure the angle of a corner.Person using an angle measurer to measure the angle of a corner.

3. Use an angle measurer to work out any joining angles for your horizontal pieces and use a saw to cut your timber.

Close-up of timber with a marked cutting line.Close-up of timber with a marked cutting line.Close-up of timber with a marked cutting line.Close-up of timber with a marked cutting line.

4. Measure and mark the height of your vertical pieces and cut them with a saw.

Power drill drilling a pilot hole into a cream wall.Power drill drilling a pilot hole into a cream wall.Power drill drilling a pilot hole into a cream wall.Power drill drilling a pilot hole into a cream wall.

5. Use a stud finder to find the stud and avoid pipework and electrics

If you know there are no pipes or electrics, you can try to find the stud by drilling small pilot holes and mark.

Power drill drilling a pilot hole into timber on wall.Power drill drilling a pilot hole into timber on wall.Power drill drilling a pilot hole into timber on wall.Power drill drilling a pilot hole into timber on wall.

6. Make pilot holes in your timber and screw into the wall with double-countersunk screws.

Timber attached to the wall below a bay window, forming the base of a DIY window seat.Timber attached to the wall below a bay window, forming the base of a DIY window seat.Timber attached to the wall below a bay window, forming the base of a DIY window seat.Timber attached to the wall below a bay window, forming the base of a DIY window seat.

7. Repeat the process until all pieces of timber are affixed to the wall.

Close-up of two long pieces of timber joined together for added strength.Close-up of two long pieces of timber joined together for added strength.Close-up of two long pieces of timber joined together for added strength.Close-up of two long pieces of timber joined together for added strength.

8. Sandwich the vertical pieces by adding another timber piece for additional strength.

Timber attached to the wall below a bay window, forming the base of a DIY window seat.Timber attached to the wall below a bay window, forming the base of a DIY window seat.Timber attached to the wall below a bay window, forming the base of a DIY window seat.Timber attached to the wall below a bay window, forming the base of a DIY window seat.

9. Secure the two front horizontal pieces in place.

Adding support beams for stability

Person wearing gloves holding a piece of timber vertically between two horizontal timber panels.Person wearing gloves holding a piece of timber vertically between two horizontal timber panels.Person wearing gloves holding a piece of timber vertically between two horizontal timber panels.Person wearing gloves holding a piece of timber vertically between two horizontal timber panels.

10. Measure and cut two pieces of timber to create vertical support beams

Add them equal distances across the length.

Person wearing gloves drilling a screw into the timber to secure the vertical support beam.Person wearing gloves drilling a screw into the timber to secure the vertical support beam.Person wearing gloves drilling a screw into the timber to secure the vertical support beam.Person wearing gloves drilling a screw into the timber to secure the vertical support beam.

11. Use a countersink drill bit then screw the timber pieces together.

Person wearing gloves drilling a screw into the timber to secure the horizontal support beam.Person wearing gloves drilling a screw into the timber to secure the horizontal support beam.Person wearing gloves drilling a screw into the timber to secure the horizontal support beam.Person wearing gloves drilling a screw into the timber to secure the horizontal support beam.

12. Measure and cut two pieces of timber to create horizontal support beams

Add your horizontal beams either side of the window seat.

Creating the front and top boards

Person holding an MDF panel against the front of the timber window seat beam foundation.Person holding an MDF panel against the front of the timber window seat beam foundation.Person holding an MDF panel against the front of the timber window seat beam foundation.Person holding an MDF panel against the front of the timber window seat beam foundation.

13. Measure and cut strips of MDF to the size of your front face.

MDF panel with a small section cut out to fit around the skirting, secured in place.MDF panel with a small section cut out to fit around the skirting, secured in place.MDF panel with a small section cut out to fit around the skirting, secured in place.MDF panel with a small section cut out to fit around the skirting, secured in place.

14. Cut out a small section to go around your skirting. Secure the MDF in place.

Skirting board with a section cut out, creating space for moulding, matching the thickness of the MDF.Skirting board with a section cut out, creating space for moulding, matching the thickness of the MDF.Skirting board with a section cut out, creating space for moulding, matching the thickness of the MDF.Skirting board with a section cut out, creating space for moulding, matching the thickness of the MDF.

15. Use a multi-tool to cut a section of your skirting out about the thickness of your MDF

This allows space for moulding.

Person wearing gloves applying wood glue to the back of a piece of moulding.Person wearing gloves applying wood glue to the back of a piece of moulding.Person wearing gloves applying wood glue to the back of a piece of moulding.Person wearing gloves applying wood glue to the back of a piece of moulding.

16. Use wood glue to stick the moulding to your bench and use a clamp while it dries.

Creating the storage lids

Base of a DIY window seat in a bay window with beams, front MDF panels, and moulding in place. Two orange overlays indicate where the seat lids will go.Base of a DIY window seat in a bay window with beams, front MDF panels, and moulding in place. Two orange overlays indicate where the seat lids will go.Base of a DIY window seat in a bay window with beams, front MDF panels, and moulding in place. Two orange overlays indicate where the seat lids will go.Base of a DIY window seat in a bay window with beams, front MDF panels, and moulding in place. Two orange overlays indicate where the seat lids will go.

17. Before cutting your top plywood, choose how many lids you want (we’re going for two).

Person wearing gloves using an angle measurer and pencil to mark a cutting line on a piece of plywood.Person wearing gloves using an angle measurer and pencil to mark a cutting line on a piece of plywood.Person wearing gloves using an angle measurer and pencil to mark a cutting line on a piece of plywood.Person wearing gloves using an angle measurer and pencil to mark a cutting line on a piece of plywood.

18. Measure your angles and cut your plywood to size

Add an inch to the front pieces to create a lip. Sand down your rough edges.

Plywood panels secured in place on top of a DIY window seat, with edges aligned to the centre of the horizontal support beams.Plywood panels secured in place on top of a DIY window seat, with edges aligned to the centre of the horizontal support beams.Plywood panels secured in place on top of a DIY window seat, with edges aligned to the centre of the horizontal support beams.Plywood panels secured in place on top of a DIY window seat, with edges aligned to the centre of the horizontal support beams.

19. Secure your pieces of plywood into place

Line up the top edge pieces with the centre of your horizontal support beams.

A person using a tape measure along a piece of plywood.A person using a tape measure along a piece of plywood.A person using a tape measure along a piece of plywood.A person using a tape measure along a piece of plywood.

20. Measure the distance between your edge pieces and divide it by the number of lids to find your lid width.

Person using a router to create a bullnose edge on the plywood lid of a DIY window seat.Person using a router to create a bullnose edge on the plywood lid of a DIY window seat.Person using a router to create a bullnose edge on the plywood lid of a DIY window seat.Person using a router to create a bullnose edge on the plywood lid of a DIY window seat.

21. Use a router to make a bullnose on the lids.

Person using a screwdriver to attach hinges to the back edge of the plywood lids on a DIY window seat.Person using a screwdriver to attach hinges to the back edge of the plywood lids on a DIY window seat.Person using a screwdriver to attach hinges to the back edge of the plywood lids on a DIY window seat.Person using a screwdriver to attach hinges to the back edge of the plywood lids on a DIY window seat.

22. Attach hinges to the back edge of the lids.

Person using a power drill to attach the plywood lids to the DIY window seat bench.Person using a power drill to attach the plywood lids to the DIY window seat bench.Person using a power drill to attach the plywood lids to the DIY window seat bench.Person using a power drill to attach the plywood lids to the DIY window seat bench.

23. Then attach the lids to the bench.

Fill, caulk and sand your surfaces before priming and paint

Person using a filling knife to smooth filler over small holes in the plywood.Person using a filling knife to smooth filler over small holes in the plywood.Person using a filling knife to smooth filler over small holes in the plywood.Person using a filling knife to smooth filler over small holes in the plywood.

24. Use a ready mixed smoother to cover any holes or joins.

Caulk being applied along the edge of the window seat where it meets the wall to create a sealed finish.Caulk being applied along the edge of the window seat where it meets the wall to create a sealed finish.Caulk being applied along the edge of the window seat where it meets the wall to create a sealed finish.Caulk being applied along the edge of the window seat where it meets the wall to create a sealed finish.

25. Use caulk to seal around the edges against the wall.

Person using a sanding block to smooth rough surfaces and edges on the DIY window seat.Person using a sanding block to smooth rough surfaces and edges on the DIY window seat.Person using a sanding block to smooth rough surfaces and edges on the DIY window seat.Person using a sanding block to smooth rough surfaces and edges on the DIY window seat.

26. Use a sanding block to sand down any rough surfaces and edges.

Person using a small paint roller to apply white paint to the base of a DIY window seat.Person using a small paint roller to apply white paint to the base of a DIY window seat.Person using a small paint roller to apply white paint to the base of a DIY window seat.Person using a small paint roller to apply white paint to the base of a DIY window seat.

27. Prime and paint your window seat

Using primer underneath will help the paint to stick and give you a better, longer-lasting finish. Water-based primers are best for wooden surfaces. Follow the instructions on the tin of your primer.

Once dry, it’s time to paint your new window bench. Use a small paint brush to get into the grooves, and the finish it off with a small paint roller. Wait for it to dry and then go over it with a second coat.

28. You're finished!

Once your window seat is dry, decorate it with cushions and blankets to make it a cosy spot to sit.

There you have it! You’ve made your very own window seat with storage. Sit down, relax, and enjoy your new window seat. If you’re looking for more DIY furniture ideas, check out our range of articles for advice and inspiration.

Digital Content Writer Ellie Reeves

Ellie Reeves

Digital Content Writer

Ellie is a content writer with over six years of experience in home décor and DIY. She’s on a mission to help people create a home they love. Big on dopamine décor and colourful accessories, she’s all about adding personality to every space...Read more