--- title: "Floor Sofa Backrest for Your Own Mattress: Parts Sold Alone" url: "https://cushionguide.com/answers/floor-sofa-backrests-own-mattress-diy/" section: "The Cutting Table" author: "Hana Lindqvist, The Quiet Geometer of Seattle" author_url: "https://cushionguide.com/masters/hana/" published: "2026-07-21" updated: "2026-07-21" keywords: "floor sofa backrest for mattress, floor bed backrest, modular floor sofa parts, floor sofa metal bars, DIY floor sofa base" --- # Can I buy just the backrests and bars and use my own mattress? *Yes. The sofa comes apart into parts, and most of them are sold alone.* Also asked as: Just one of the 79 x 39 in sofa mattresses; Can I use my own mattresses? > **The quick answer:** Yes: floor sofa backrests and metal bars are sold separately, so you can build on your own mattress or base. The standard sofa mattress is about 39 x 79 x 6.7 in (100 x 200 x 17 cm). L-shaped backrests can be sized to your mattress, covers can be made for mattresses you already own, and foam and frame can be bought without covers for less. ![Cream velvet floor sofa with teal ends in a bright flat with an oak bookcase, monstera plant and low coffee table](https://cushionguide.com/media/modular-floor-sofas/teal-velvet-floor-sofa-bookcase-monstera-1600.webp "Teal velvet ends set against a full bookcase and a monstera in a bright European apartment.") ## Key facts - The standard floor sofa mattress is about 39 x 79 x 6.7 in (100 x 200 x 17 cm). - Backrests and metal bars are sold separately. - L-shaped backrests can be sized to your own mattress, such as a 35 x 79 in (90 x 200 cm) orthopedic one. - Covers can be made to fit mattresses you already own. - Single sofa and ottoman mattresses are sold on their own for your own base. - Cushions and metal frame can be bought without covers, for less. ## The sofa, taken apart The floor sofa is a set of parts, and most of them are sold on their own. A base you built, or a mattress you already sleep well on, is a reasonable place to start. The standard sofa mattress is about 39 x 79 x 6.7 in (100 x 200 x 17 cm). If yours is a different size, covers can be made to fit it. Backrests and [metal support bars](https://cushionguide.com/glossary/#metal-support-bars) are sold separately. The [modular floor sofa](https://cushionguide.com/cushions/modular-floor-sofas/) hub shows the full sets, for comparison. ## Parts you can buy on their own - ✓ Straight backrests - ✓ L-shaped corner backrests, sized to your mattress - ✓ Metal support bars - ✓ Single sofa mattresses, about 39 x 79 in (100 x 200 cm) - ✓ Single ottoman mattresses, about 39 x 39 in (100 x 100 cm) - ✓ Covers made for a mattress you already own - ✓ Foam and frame without covers ## Three builds One buyer had a built-in base about 118 in (3 m) long. One sofa mattress and one ottoman mattress filled it end to end, with a spare cover set in another color. Another wanted a floor bed on a 35 x 79 in (90 x 200 cm) orthopedic mattress, and ordered L-shaped backrests sized to it. A third asked for the cushions and metal frame without covers, and got a custom listing for less. [Floor sofa as a bed](https://cushionguide.com/guides/floor-sofa-bed-size-firmness/) covers firmness for sleeping. What is under your mattress now? A mattress you already trust. A back that fits it. Little else is needed. ## Measure before you message - ✓ Your mattress: width, length and thickness - ✓ Your base: full length and depth - ✓ Where the backs go: one side, two sides, or around a corner - ✓ How many L-shaped backrests that takes - ✓ Covers or no covers, and which color > **Tailor's margin:** A floor sofa backrest can be sized to your own mattress: a 35 x 79 in (90 x 200 cm) orthopedic one has taken L-shaped backs as a floor bed. > One 79 x 39 in sofa mattress plus one 39 x 39 in ottoman mattress fill a 118 in (3 m) built-in base end to end. > > — Hana ## Buyer questions **A common question:** What size are your sofa mattresses? I'd like to use my own and buy the rest. **The workshop's answer:** Each standard couch mattress is about 39 x 79 x 6.7 in (100 x 200 x 17 cm). The workshop can make covers to fit your own mattresses and sells the metal bars and backrests separately, so a DIY base works. **A common question:** Can I buy single mattress modules for a long base I already have? **The workshop's answer:** Yes. For a 118 in (3 m) built-in base, the shop sold one 79 x 39 in (200 x 100 cm) sofa mattress and one 39 x 39 in (100 x 100 cm) ottoman mattress, plus a spare set of covers in another color. **A common question:** Can I buy just the corner backrests for my own mattress as a floor bed? **The workshop's answer:** Yes. Buy as many L-shaped backrests as you need and the shop sizes them to your mattress, for example a 35 x 79 in (90 x 200 cm) orthopedic mattress. **A common question:** Would you sell the cushions and metal frame without covers for less? **The workshop's answer:** Yes. The shop set up a custom listing for the cushions and metal frame without covers, priced below the covered sofa. ## Questions buyers ask next ### Can each floor sofa piece be a different color? Yes. List the color for each piece in the personalization note; seat, backrest and armrests can all differ. Or choose one color for a fully matching set, which is simpler if you plan to add parts later. ### Can one damaged backrest be replaced later? Yes. Straight and L-shaped backrests, seat cushions and covers-only sets are sold individually, so a damaged corner or a gap can be filled without buying a whole sofa. The L-backrest matches the full teddy sofa size. ### Can the floor sofa backrests be made slimmer? Yes, for example about 7 in (18 cm) deep instead of 15 in (39 cm), though thinner backs are less durable. Height isn't reduced, because the height is what supports the person sitting. ## Related at the atelier - [Can a floor sofa be made taller or lower?](https://cushionguide.com/answers/floor-sofa-seat-height-taller-lower/): Yes: stack an extra base cushion to make a floor sofa taller, or order it with one floor cushion instead of two to make it lower. - [Can I buy just the metal bars or frame without the sofa?](https://cushionguide.com/answers/floor-sofa-metal-bars-sold-separately/): Not as a standalone product: the floor sofa's metal bars and frames aren't sold on their own, not even for DIY or art projects. - [Can I buy the metal support bars for my floor sofa separately?](https://cushionguide.com/answers/floor-sofa-metal-support-bars-sold-separately/): Usually yes: spare metal support bars have their own listing, or the workshop sends a custom purchase link, normally for a set of 4 (one for each side of the sofa), and pairs of 2 are possible too. - [Assembling floor sofa metal bars, and keeping the sofa from sliding](https://cushionguide.com/guides/floor-sofa-support-bars-assembly/): Floor sofa metal bars join by twisting and pushing each section until the small spring dots click into their holes; no screws are needed. - [Can you sleep on a floor sofa? Bed size, firmness and sheets](https://cushionguide.com/guides/floor-sofa-bed-size-firmness/): A modular floor sofa opens into a guest bed of about 79 x 79 in (200 x 200 cm), close to king size, when its two seat mattresses lie side by side. - [Modular Floor Sofa in Cobalt and Cream Velvet, City Apartment](https://cushionguide.com/readings/cobalt-velvet-floor-sofa-city-apartment-rug/): A modular floor sofa is finished by hand in ways you mostly can't see: the foam is cut slightly larger than its cover so the cover looks full, non-slip fabric is sewn under the seat bases, and every… *— Hana* --- Written by Hana Lindqvist (https://cushionguide.com/masters/hana/) 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/floor-sofa-backrests-own-mattress-diy/