The space under a window is usually wasted. A radiator, a plant, maybe nothing at all.
Add a seat there and it often becomes the favorite spot in the house. Morning coffee, reading, kids’ homework, a cat nap in the sun.
Most window seats are just a strong box with a cushion on top. Add storage and it earns its place twice over.
These 15 DIY window seat ideas cover simple storage seats, bay windows, bookshelf nooks, kids rooms, apartments and budget builds.
1Simple Window Seat with Storage
A plywood box with a hinged lid is the easiest window seat to build.
This window seat storage bench shows the style. Use lid support hinges so the lid cannot slam on little fingers.
- Easiest build
- Hidden storage
- Safe lid hinges
Project Card · 1 weekend · Medium
Materials Needed
- 3/4 inch plywood
- Piano hinge
- Soft close lid support hinges
- Wood screws, glue and drill
- Sandpaper, primer and paint
- Seat cushion
How to Make It
- Cut plywood for the front, back, sides and bottom at about 18 inches tall.
- Glue and screw the box together, checking it is square.
- Cut a lid with a small overhang and attach it with a piano hinge at the back.
- Add soft close lid supports so the lid stays open and closes slowly.
- Sand, prime, paint and add the cushion, then screw the box to the wall studs.
My Pick
Window Seat Storage Bench
A hinged lid storage bench to copy for your build or use as is.
2Add a Thick Comfortable Cushion
The cushion decides whether anyone actually sits there. Go thick, at least 3 to 4 inches.
This indoor window seat cushion comes in many sizes. Add a few pillows against the wall and it is instantly cozy.
- Thick is better
- Measure first
- Add pillows
My Pick
Indoor Window Seat Cushion
Thick, comfy cushion in many sizes and colors.
3Make a No Sew Window Seat Cushion
No sewing machine? No problem. Wrap foam in fabric and glue it underneath like a gift.
Start with high density foam cut to size. Any fabric works, from drop cloth to velvet.
- No sewing
- Custom size
- Any fabric
Project Card · 1 hour · Easy
Materials Needed
- High density foam cut to the seat size
- Batting (optional)
- Upholstery fabric
- Hot glue gun or iron on hem tape
- Scissors
How to Make It
- Measure the seat and cut the foam to fit exactly.
- Wrap the foam in batting for a softer top.
- Lay fabric face down and center the foam on top.
- Pull each side tight and glue it on the underside.
- Fold the corners neatly like wrapping a present and glue them flat.
My Pick
High Density Foam for Seat Cushions
The right firmness for a no sew cushion that does not go flat.
4Add Drawers for Easy Storage
Drawers are easier than a lift up lid. Pull one out without moving the cushion.
This window seat with drawers shows the layout. Full extension slides let you reach the very back.
- No lifting
- Sorted storage
- Full extension
My Pick
Window Seat with Drawers
Pull out drawers so you never lift a heavy lid.
5Build a Bay Window Seat
A bay window is made for a seat. The three sided nook already feels cozy.
Build three boxes to fit each section and top them with a bay window seat cushion. Measure each side, since they are rarely equal.
- Natural nook
- Three sections
- Custom look
My Pick
Bay Window Seat Cushion
Cushion sets shaped for three section and L shaped bay seats.
6Cube Shelf Window Seat Hack
Low cube shelves under a window make one of the fastest window seats ever.
This cube storage unit gives instant storage for books and baskets. Always anchor it to the wall.
- Super fast
- Budget friendly
- Anchor to wall
My Pick
Cube Storage Unit for a Window Seat
Low cube shelves that become an instant window seat base.
7Add Bookshelves on Each Side
Books on both sides, a cushion in the middle and natural light. The dream reading nook.
This bookshelf combo shows the look. Secure the towers to the wall and paint everything one color.
- Reading nook
- Built in look
- Secure towers
My Pick
Window Seat Bookshelf Combo
Bookshelves that frame a seat for a cozy reading nook.
8Kids Room Window Seat with Toy Storage
A window seat in a kids room is a reading spot, play surface and toy box in one.
Use open cubbies with small fabric baskets so kids can tidy up on their own.
- Kids love it
- Easy cleanup
- Bright colors
My Pick
Small Fabric Storage Baskets
Small fabric baskets that slide into cubbies for toys and books.
9Window Seat with a Pull Out Bed
A trundle under the seat turns a reading nook into a guest bed.
This trundle bed frame rolls out on castors. Make sure it clears the wall when fully open.
- Guest bed
- Hidden away
- Space saver
My Pick
Trundle Bed Frame for a Window Seat
A rolling trundle that hides a guest bed under the seat.
10Budget Window Seat Under $100
2x4s and plywood cost very little. The finish is what makes it look custom.
Sand well, prime, paint two coats and caulk the gaps where it meets the wall.
- Under $100
- Basic lumber
- Caulk for built in look
Project Card · 1 weekend · Medium
Materials Needed
- 2×4 lumber for the frame
- 3/4 inch plywood for top and sides
- Wood screws and drill
- Sandpaper, primer and paint
- Paintable caulk
How to Make It
- Build a rectangular 2×4 frame the width of the window and about 16 inches tall.
- Screw the frame into wall studs at the back.
- Cover the front, sides and top with plywood.
- Sand, prime and paint with two coats.
- Caulk every gap along the wall and floor for a built in finish.
11Renter Friendly Apartment Window Seat
Cannot drill? A freestanding bench or storage ottoman under the window does the job.
Add a cushion, a few pillows and a small side table. Use anti tip straps if your lease allows.
- No drilling
- Moves with you
- Cozy nook
12Window Seat Around a Baseboard Heater
Never fully cover a heater. Cut vent slots or a grille in the front panel.
Leave clearance above the heater and follow the heater maker’s clearance rules for any wood nearby.
- Keep it vented
- Follow clearances
- Still looks built in
13Window Seat with a Pet Hideaway
Cut an arched opening in the front and line it with a soft mat. Instant pet den.
Cats love it. A cozy cave below and a sunny window above.
- Pet favorite
- Cozy den
- Smooth edges
14Window Seat with Open Toy Cubbies
Open cubbies with labeled baskets are the easiest storage for little kids.
No heavy lids, no stuck drawers. Kids pull out a basket and put it back.
- Kid friendly
- Labeled baskets
- No heavy lids
15Filing Cabinet Window Seat Hack
Two filing cabinets with a wood board on top make a sturdy seat with drawer storage.
Paint both cabinets the same color, screw them together and add a cushion.
- Upcycle
- Office storage
- Weekend hack
Frequently Asked Questions
How tall should a window seat be?
Around 18 inches including the cushion is standard, the same height as a dining chair.
How deep should a window seat be?
15 to 20 inches deep is comfortable for sitting. Go deeper if you want to curl up or lie down.
Is a lift up lid safe in a kids room?
Use soft close lid supports so the lid cannot slam shut. Open cubbies or drawers are even easier for kids.
Can I build a window seat over a heater?
Yes, but never enclose it. Leave vent openings in the front and follow the heater’s clearance rules.
What is the cheapest way to make a window seat?
Low cube shelves or a simple 2×4 and plywood box with a no sew cushion on top.
Final Thoughts on DIY Window Seat
A window seat turns wasted space into the coziest spot in the room, often with storage hidden underneath.
Start with a simple box or cube shelves, add a thick cushion and a few pillows. You will wonder why you waited so long.
Amir Ali is the founder and site administrator of HomeDecorEdge, a modern home decor and interior design platform. Since starting the site, he has combined his passion for interior design, practical styling, and color coordination with hands-on content strategy and site management. He guides authors, curates high-quality articles, and ensures readers have access to actionable, visually inspiring, and user-focused home decor advice for apartments, small rooms, and family homes.
