---
title: "Sunroom Cushions for Window Seats, Benches and Daybeds"
url: "https://cushionguide.com/cushions/sunroom-cushions/"
section: "The Cushion Atlas"
author: "Callum Reid, The Weather Man of Casco Bay"
author_url: "https://cushionguide.com/masters/callum/"
published: "2026-03-20"
updated: "2026-09-24"
keywords: "sunroom cushions, three-season room cushions, sunroom window seat cushion, sunroom bench cushion, conservatory cushions, sunroom daybed cushion"
---

# Sunroom cushions for the window seat, the bench and the three-season room

*A sunroom is a porch that moved indoors and kept the weather. Glass on three sides, sun all afternoon, a chill after dark. Here is how buyers size, cover and fill the seats out there.*

> **The quick answer:** Sunroom cushions are made-to-measure foam cushions for the window seats, benches and daybeds of a glassed-in room, 4 in (10 cm) thick as standard with a zippered, removable cover. Choose color in the room's own light, add ties or a non-slip base on narrow seats, and if the room goes unheated in winter, store the cushions indoors like porch cushions.

![Burnt orange velvet window seat cushion with off-white piping below large white windows overlooking a striped lawn](https://cushionguide.com/media/window-seat-cushions/burnt-orange-velvet-sunroom-window-seat-1600.webp "Burnt orange velvet with off-white piping gives a white sunroom window seat a warm center against the green garden view.")

## Glass on three sides: who the sunroom cushion is for

A sunroom gets two climates a day. Noon through glass is bright and warm; the hour after sunset can feel like the porch in October. A cushion out there lives with both.

This page covers **sunroom cushions** of every kind buyers ask us about: the window seat under tall multi-pane glass, the storage bench by the French doors, the rattan daybed between the ferns, the teak bench on a brick floor in a three-season room. Shape-by-shape help sits under [window seat cushions](https://cushionguide.com/cushions/window-seat-cushions/), [bench cushions](https://cushionguide.com/cushions/bench-cushions/) and [daybed cushions](https://cushionguide.com/cushions/daybed-cushions/). If your room has screens instead of glass, it is a porch, and [patio and porch cushions](https://cushionguide.com/cushions/patio-and-porch-cushions/) is your page; [screened porch cushions](https://cushionguide.com/concepts/screened-porch-cushions/) covers the in-between.

## On the cutting table: sunroom sizes and build

|   |   |
|---|---|
| Standard thickness | 4 in (10 cm) for window seat and bench cushions; most buyers keep it |
| Thinnest foam | 2 in (5 cm); 1 1/4 in (3 cm) can still take piping |
| Front overhang | Up to about 2 in (5 cm) with an inner support wrap |
| Arched or curved seat | Drawn as a rectangle plus an arc of a circle, or traced as a paper template |
| L-shaped corner bench | End-to-end length of each leg, the depth, and whether you want backrests |
| Backrests | Softer than the seat by default; can be made equally firm |
| Cover | Zippered, fully removable, hidden on the back edge or underside |
| Staying put | Non-slip base across the whole bottom panel, or ties at the corners or back |

## The glass draws the shape

The windows decide the cushion. A long run of multi-pane glass gives a long rectangle. An arched window gives a seat with a curved front. A glazed corner gives an L, and an L is two pieces, split and confirmed before anyone cuts. The how-to lives in [L-shaped bench cushions: how to measure both runs](https://cushionguide.com/guides/l-shaped-bench-cushion-measurements/) and [measuring a curved cushion](https://cushionguide.com/guides/curved-cushion-chord-rise-radius/).

Edges are yours to choose: brick-red piping on an ivory bench beside terracotta tile draws the outline, and a plain edge keeps it soft. Just know that tufted French cushions are fiber-filled and stitched shut with no zipper. In a room people walk into straight from the yard, the zippered box cushion is the one you can take apart and wash.

## Fabric for sun, heat and damp mornings

Glass lets the sun in hard, and a sunroom collects damp on cold mornings. Fabric for that has its own Pattern: [sunroom cushions: fabric for sun, heat and damp air](https://cushionguide.com/guides/sunroom-cushion-fabric-humidity/). For fading, read [will a window seat cushion fade?](https://cushionguide.com/guides/window-seat-cushion-fading-sun/)

In the Swatch Library, look at [outdoor acrylic and solution-dyed fabrics](https://cushionguide.com/fabrics/outdoor-acrylic/) if the room is barely indoors, and at [performance and pet-friendly weaves](https://cushionguide.com/fabrics/performance-and-pet-friendly/) or [linen-look weaves](https://cushionguide.com/fabrics/linen-look-fabrics/) if it is heated and lived in all year. Stripes suit strong light: turquoise and rust on reclaimed timber, periwinkle and maroon on white paneling.

Color is the other weather. It reads one way at noon in a glass room, another under a lamp, another on a screen, and chart swatches can look darker or coarser than the cloth. Photos of finished cushions are the most honest reference you'll get.

## Foam, thickness and the cold months

The standard is 4 in (10 cm) of foam. Firmness sits around 6 to 7 on a 10-point scale, with backrests softer unless you ask for a match. High-density foam keeps a long window seat flat and square, and a seat can overhang the front edge by up to about 2 in with an inner support wrap.

A three-season room earns its name. If yours goes unheated in winter, treat the cushions the way you'd treat porch cushions, which the workshop advises storing indoors in the off-season. Bring them in before the first frost and they'll forgive you everything. A fabric protectant spray on the covers helps in between.

Check the finished height in the [seat height calculator](https://cushionguide.com/studio/seat-height-calculator/) before you go thicker. Window sills don't move.

## An arched window seat, drawn as a box and a curve

A buyer got in touch about an arched window seat. The question was the one every curve brings: what numbers do you need?

Numbers alone won't do it, friend. We don't guess a curve. The seat was drawn as what it is, a rectangle plus an arc of a circle: total width and depth, the straight length of each side before the curve begins, where the curve starts and ends, and how deep it runs at its deepest point.

For a curve that won't sit still on paper, there's the template. Lay wrapping paper or newspaper on the seat, trace the edge with a marker, cut it out and photograph it flat beside a tape measure. Each cushion gets its own drawing, and the shape comes back to you for a yes before production.

## Sunroom cushion mistakes, and the fix for each

- ✗ Cutting a window seat cushion exactly to a shallow seat. With nothing to grip it slides; go slightly larger or add a non-slip base.
- ✗ Leaving back cushions loose on a bench. Tie them to the seat, or ask for double piping to give them structure.
- ✗ Writing 'add ties' in the dimension box. Ties come only on request; put their position, length and color in writing.
- ✗ Approving the pre-dispatch photo without checking the small extras: ties, straps, the non-slip base.
- ✗ One long cushion over a lift-up window seat lid. Split it at each lid break and add ties.
- ✗ Choosing color from a phone in a dark room. Judge it in the sunroom's own light.

> A sunroom window seat cushion cut exactly to a shallow seat has nothing to grip. Add a non-slip base or ties, or order it slightly larger.
>
> — Callum

## Styling for light, then the tools

The hero photograph is a burnt orange velvet window seat under tall multi-pane windows, looking out on a striped lawn. The orange holds its own against all that green, and white paneling keeps the corner bright. One strong color, plenty of glass, nothing else competing.

Across the gallery: a dusty rose seat with a cream center cushion under corner casements; powder blue damask seat and back cushions among palms on a limestone floor; a red and cream striped daybed mattress on a rattan frame between Boston ferns.

What's the longest run of glass in your sunroom? Measure it, then draw the seat in the [bench cushion builder](https://cushionguide.com/studio/bench-cushion-builder/), or in the [bay window calculator](https://cushionguide.com/studio/bay-window-calculator/) if the glass steps out. Read [how to measure a window seat cushion](https://cushionguide.com/guides/how-to-measure-window-seat-cushion/) and [keeping back cushions upright](https://cushionguide.com/guides/back-cushions-staying-upright/), and see [sunroom colors that last](https://cushionguide.com/concepts/sunroom-cushions-colors-that-last/). More weather notes are on [Callum's page](https://cushionguide.com/masters/callum/).

> **Tailor's margin:** Tie sunroom back cushions to the seat, or order double piping. Double piping can give a back cushion enough structure to stay upright without straps.

## Buyer questions

**A common question:** What do you need to quote an L-shaped corner bench with back cushions?

**The workshop's answer:** The end-to-end length of each leg, the seat depth and thickness, a sketch or photo, whether any part is angled, and whether you want backrests. Outside and inside measurements work too, and the split into two pieces is planned and confirmed with you. A photo of the nook and a picture of the backrest style help. Backs can run along one side only, and the standard thickness is 4 in, which can be changed.

**A common question:** I changed my mind on the color right after I ordered. Can you switch it?

**The workshop's answer:** Most likely, if the order hasn't shipped yet. The switch is checked with production before it's confirmed, so send the exact color name or number from the chart; a general 'green' gets a request for the code. If the parcel is already packed and leaving that day, it goes as ordered, and a spare cover set in the new color is the way out.

**A common question:** One cushion in my set is the wrong length. What do you need from me?

**The workshop's answer:** A photo with a tape measure laid along the full length. If the workshop made the error, keep the wrong piece until it has answered. In past cases only the non-fitting parts were remade, errors ran from 3 in to 8 in off, and buyers could pick a different piping color for the replacement or keep the piece for a partial refund.

**A common question:** Our new house isn't taking deliveries yet. Can you hold the cushions until we move in?

**The workshop's answer:** Often, yes. Add 'please deliver on or after' and the date to the order note or personalization box, or message the shop, so the order is held or timed to that date. For a new-build address that isn't receiving deliveries, ask whether it can be held until you've moved in. Transit can run longer than expected, so an exact day can't be promised.

**A common question:** Can an order placed by accident be canceled?

**The workshop's answer:** Yes, before production starts, with a refund that can take a few days to show; once cutting has begun, ask the workshop what can still change. You'll likely be asked what went wrong first: a different size or color can be made instead, a later ship date offered, or your space measurements checked. If you'd still rather cancel, the order is canceled on request.

## Sunroom questions, answered plainly

### Can a sunroom bench cushion be tied to its backrest?

Yes. Fabric ties can be sewn into the seams at the corners or the back, in any position, to tie a backrest to a seat or fix a cushion to the bench. Double piping can give back cushions enough structure to stay in place without straps.

### Do sunroom cushions need to come inside for winter?

In a heated sunroom they can stay put. In a true three-season room that turns cold and damp, treat them like outdoor cushions, which the workshop advises storing indoors in the off-season, and use a fabric protectant spray on the covers.

### What thickness suits a sunroom window seat?

The standard 4 in (10 cm), the same used for bench, window seat and outdoor cushions, and the one most buyers keep. The thinnest standard foam cushion is 2 in (5 cm). A seat can overhang its front edge by up to about 2 in with a support wrap.

### Will sunroom glare change how my cushion color looks?

It can. Color reads differently in daylight, under home lighting and on screens, and a glass room is daylight at full strength. Chart swatches can also look darker or coarser than the real fabric, so compare against photos of finished cushions before you decide.

### Can sunroom cushions ordered a season apart match exactly?

Closely, but not guaranteed. Dye batches can differ slightly between production runs, so an exact match across separate orders isn't promised. If the room needs seat cushions, backs and pillows, order them together in one batch.

## Related at the atelier

- [Garden Bench Cushion in Blush Stripe for a Narrow Greenhouse](https://cushionguide.com/readings/blush-stripe-glasshouse-teak-bench-cushion/): A garden bench cushion in a narrow greenhouse should fit between the arms and fill the seat depth, with no back cushion, so the slatted back stays on show and the aisle feels open.
- [Window Seat Cushion in Blue Pinstripe over Sunroom Cubbies](https://cushionguide.com/readings/blue-pinstripe-window-seat-sunroom-cubbies/): A window seat cushion over open cubbies needs a firm, high-density foam block so the seat stays flat across the gaps instead of dipping into them.
- [Why mildew grows under a window seat cushion in winter, and what helps](https://cushionguide.com/guides/window-seat-cushion-mildew-condensation/): Mildew under a window seat cushion comes from condensation: warm, moist room air meets a cold sill or glass, and the water sits under a cushion that never lifts.
- [Sunroom cushions and three-season rooms: color that survives the light](https://cushionguide.com/concepts/sunroom-cushions-colors-that-last/): Sunroom cushions that sit in long, intense direct sun hold their color best in UV- and fade-resistant outdoor fabric.
- [Cushions for Arizona and the desert Southwest](https://cushionguide.com/places/arizona-southwest-cushions/): Arizona outdoor cushions need UV-resistant, water-repellent outdoor fabric in lighter desert tones, because sun, not dryness, is what wears them out.
- [Will a window seat cushion fade? Choosing fabric for sun through glass](https://cushionguide.com/guides/window-seat-cushion-fading-sun/)

*Fair winds — Callum*

---

Written by Callum Reid (https://cushionguide.com/masters/callum/) for CushionGuide (https://cushionguide.com/about/). The site explains made-to-measure cushions and the partner workshop makes them; measurements are in inches first. This Markdown mirrors the page at https://cushionguide.com/cushions/sunroom-cushions/