Quick answer: most window seats are 16" to 24" deep and 36" to 96" long. Measure your own seat, because built-ins are rarely a standard size, then order a cushion cut to those exact numbers.
Common window seat sizes
| Seat type | Typical size | Sample price* |
|---|---|---|
| Small reading nook | 16" x 40" | $78.99 |
| Standard window seat | 18" x 48" | $90.99 |
| Wide window seat | 20" x 60" | $111.99 |
| Bay window or daybed nook | 24" x 72" | $145.99 |
| Long built-in bench | 22" x 96" | $205.99 |
*ShadeMart custom window seat cushion, 1.8" thick, before optional fabric upgrades, piping or ties. See your exact price on the product page by entering your size.
How deep should a window seat cushion be?
Match the seat depth exactly. If the wall is not square, measure depth at both ends and use the smaller number so the cushion does not bulge. For angled bay windows, send us a sketch with all side lengths and we will quote a custom shape.
How thick should it be?
- 1.8" to 2.6": a slim, tailored look that keeps the seat height low.
- 3.8": the most popular choice for reading and lounging.
- 4.5": plush, daybed-style comfort.
More detail in How thick should a bench cushion be?
Which fabric?
For sunny windows, lighter colors show fading less; for cats and dogs choose the anti-scratch fabric; for kids and spills choose a waterproof chenille. Compare them in our pet-friendly fabric guide and fabric guide.
How to measure
- Measure the length wall to wall at the back and at the front edge.
- Measure the depth at both ends.
- Round to the nearest inch and use the smaller numbers.
Every cushion is made to order in 1–3 business days with 70D high-resilience foam and a removable zipper cover. Get your window seat cushion price · Bay window cushion guide
Shop: Window Seat Cushions
