---
title: "Replacement Back Cushion for a Floor Sofa: 39 x 15 x 15 in"
url: "https://cushionguide.com/answers/straight-backrest-pillow-floor-sofa-size/"
section: "The Cutting Table"
author: "Harlan Pruitt, The Elder of High Point"
author_url: "https://cushionguide.com/masters/harlan/"
published: "2026-08-18"
updated: "2026-08-18"
keywords: "replacement back cushion for floor sofa, floor sofa straight backrest, modular floor sofa back pillow size, corner backrest floor sofa, spare backrest cushion"
---

# Can I buy a single straight backrest pillow for my floor sofa, and what size is it?

*A good backrest outlives the arguments over who gets the corner. When one wears out or goes missing, you replace the one, not the sofa.*

Also asked as: I need a replacement for my back cushion; Can I purchase just two straight backrest pillows?

> **The quick answer:** Yes, the straight backrest for the floor sofa is sold on its own and measures 39 x 15 x 15 in (100 x 39 x 39 cm). That's about the same size as similar floor sofas from other makers, so it can replace or add to one you already own. It comes in any of the sofa colors, including corduroy, and custom sizes with sharp or rounded corners are possible.

![Rust orange and cream velvet floor sofa on a jute rug, with pampas on a rattan table, wicker baskets and stacked books](https://cushionguide.com/media/modular-floor-sofas/rust-cream-floor-sofa-boho-corner-rattan-table-1600.webp "Rust velvet ends pick up the jute rug, rattan table and baskets around this floor-level sofa.")

## Key facts

- The straight backrest is sold individually, with its filling.
- It measures 39 x 15 x 15 in (100 x 39 x 39 cm).
- It fits similar-size floor sofas from other makers.
- The corner (L-shaped) backrest measures 39 x 39 in (100 x 100 cm).
- A spare straight backrest lets you switch between closed and open corner layouts.
- Custom straight backs come with sharp or rounded corners, and a photo is sent before shipping.

## Straight or corner: the two floor sofa backrests

| Backrest | Size | What it's for |
|---|---|---|
| Straight | 39 x 15 x 15 in (100 x 39 x 39 cm) | Replacing a worn back, extending a run, filling the gap between two sofas |
| Corner (L-shaped) | 39 x 39 in (100 x 100 cm) | Closing a corner |
| Custom straight | Your size | Sharp or rounded corners; photo before shipping |

## Where to order just the one

The straight backrest is an option on the modular sofa listing and on the ottoman-with-backrest listing, or it comes through a custom link. Pick any of the sofa colors, [corduroy](https://cushionguide.com/fabrics/corduroy/) included, and give the code from your first order so the new one matches the old.

Because the size is close to other makers' floor sofas, it can back a sofa you bought elsewhere too. Measure yours first, my friend. Buy the cushion once, cry once. For more ways to arrange the pieces, see [modular floor sofa layouts](https://cushionguide.com/guides/modular-floor-sofa-layouts/) and the [modular floor sofas](https://cushionguide.com/cushions/modular-floor-sofas/) page.

## Good reasons to keep a spare straight back

- ✓ Switch between a closed corner and an open corner without buying another sofa
- ✓ Fill the gap when two floor sofas are pushed together along one wall
- ✓ Replace one worn backrest instead of the whole set
- ✓ Swap an L-shaped corner pillow for a straight one at the same price

## Two sofas, one long wall

A buyer in the US bought a second L-shaped floor sofa to join the first. Two L's side by side leave a gap in the back line, and straight backrests are what close it. With that order, the workshop put two straight backrests in the box free.

I wouldn't count on the gift, but I'd count on the fit. How long is the wall you're filling?

> **Tailor's margin:** Measure your old floor sofa backrest before ordering; the straight replacement is 39 x 15 x 15 in (100 x 39 x 39 cm), close to other makers' sizes.

> A straight floor sofa backrest at 39 x 15 x 15 in can replace a worn back, open a corner, or join two sofas into one long run.
>
> — Harlan

## Buyer questions

**A common question:** Can I buy just one replacement back cushion for my modular corduroy sofa?

**The workshop's answer:** Yes. Straight backrest pillows are sold alone through a custom link and measure 39 x 15 x 15 in (100 x 39 x 39 cm). L-shaped backrests are sold separately through the ottoman-with-backrest listing, with or without ottomans, in any corduroy color such as COR-207.

**A common question:** Can you make two straight back cushions like the ones on your sofas, but in my size?

**The workshop's answer:** Yes. Two custom straight backs were quoted in indigo corduroy. The workshop asks whether you want oval or sharp corners and sends a photo before shipping, so you can still ask for rounder corners.

**A common question:** Can I buy only the back cushions, like a spare straight backrest?

**The workshop's answer:** Yes. Straight and L-shaped backrests are sold on their own through the ottoman-with-backrest listing. A spare straight cushion lets you switch between closed and open corner layouts.

**A common question:** Can I order straight backrests without the corner piece, to combine two sofas?

**The workshop's answer:** Yes. A 39 in (100 cm) straight backrest is sold alone; the other option is the 39 x 39 in (100 x 100 cm) corner backrest. When one buyer added a second L-shaped sofa, two straight backrests were included free.

## Questions buyers ask next

### Will a new straight backrest match my older floor sofa's color?

It's made in any of the sofa colors and matched to your original color through a private link. Give the exact code from your first order, such as a corduroy COR number, so the workshop uses the same color.

### Can I trade an L-shaped corner backrest for a straight one?

Yes. An L pillow can be swapped for a straight one at the same price. That's handy when you want to open a closed corner into a longer straight run, or rearrange the sofa for a different wall.

### Does a replacement floor sofa backrest come filled?

Yes. Straight and L-shaped backrests are sold individually with their filling, not as empty covers, so the new piece arrives ready to set against the wall beside the others.

## Related at the atelier

- [Can the floor sofa backrests be made slimmer, smaller or taller?](https://cushionguide.com/answers/custom-slimmer-floor-sofa-backrests/): Yes, floor sofa backrests can be made slimmer: L-shaped and straight backrests have been remade 7 in (18 cm) deep instead of 15 in (39 cm).
- [Can I add a backrest to the ottoman to make a chair or small sofa?](https://cushionguide.com/answers/add-backrest-to-ottoman/): You can add a backrest to the modular floor sofa's ottoman and turn it into a lounge chair or a small L-shaped sectional.
- [How many metal bars hold up the backrests on a floor sofa?](https://cushionguide.com/answers/floor-sofa-backrest-support-bars/): A standard modular floor sofa comes with 4 metal support bars: 2 for the sides and 2 along the back that hold the back cushions.
- [Modular Floor Sofa Corner in Light Gray Tufted Modules](https://cushionguide.com/readings/light-gray-tufted-floor-sofa-corner-modules/): A modular floor sofa suits long sitting when every piece stays loose and the modules stay put.
- [Floor Sofa in Cobalt and Cream Velvet: One Back or Two](https://cushionguide.com/readings/cobalt-blue-cream-floor-sofa-white-room-window/): For a floor sofa about 41 x 83 in (104 x 211 cm), two 16 x 41.5 in (41 x 105 cm) backrests are easier to handle than one 16 x 83 in back, and each half can take its own color.
- [Corduroy modular floor sofas and cushions: wale size, nap direction, why no piping](https://cushionguide.com/guides/corduroy-cushions-wale-nap-direction/): A corduroy cushion for a sofa or floor seat should be wide wale, roughly 3 to 8 ribs per inch, with every piece cut so the nap runs the same way.
- [Corner floor sofa layouts: L-shapes, U-shapes, open or closed corners, straight runs](https://cushionguide.com/guides/modular-floor-sofa-layouts/)
- [Replacement covers for a floor sofa: fit, color change and single pieces](https://cushionguide.com/guides/floor-sofa-replacement-covers/)

*Sit well. — Harlan*

---

Written by Harlan Pruitt (https://cushionguide.com/masters/harlan/) 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/answers/straight-backrest-pillow-floor-sofa-size/