Fold-Out Sofa Beds: How the Mechanism Works & What to Buy (UK Guide)

A fold-out sofa bed is one of the smartest pieces of furniture for a small space. It pulls double duty — everyday sofa, occasional guest bed — without asking you to compromise comfort on either front. But not every fold-out works the same way, and the mechanism you choose changes everything about how you live with it.

Browse Koala sofa beds →

Key takeaways

• A fold-out (flip) sofa bed converts in one motion and gives you a continuous sleeping surface — no bar, no wrestling with a metal frame.

• In the UK, Koala makes one fold-out sofa bed, the Koala Sofa Bed [4th Gen], in three sizes (1.5-, 2.5- and 3-Seater) and eight finishes.

• The three seat widths map to Single, Double and King-width sleeping surfaces, so you choose by how many you seat and how many sleep.

• It ships free across most of the UK, sets up tool-free, and comes with a 120-day trial and a 5-year warranty.

What is a fold-out sofa bed?

A fold-out sofa bed is a convertible sleeper sofa where the backrest and seat hinge flat to form a single sleeping surface — no separate mattress stored on a metal frame underneath. That's what sets it apart from the other mechanisms on the market, and why it sets up in seconds rather than minutes.

Four mechanisms cover most of what you'll find in UK showrooms and online:

The pull-out action frame is the traditional put-you-up. It works, but the metal cross-bar and extra setup steps are a common complaint. Click-clack sofas are cheap and compact but tend to sleep firm. The fold-out flip avoids the bar and the faff, which is why it suits people who sleep on their sofa bed regularly.

In the UK, Koala makes a single fold-out sofa bed: the Koala Sofa Bed [4th Gen], which uses FlipBed™ — the sofa transforms into a bed in one smooth flip, with no clunky mechanism and no tools.

Not sure a fold-out is right for you? Compare the range on the sofa beds collection page to see how it stacks up against a traditional pull-out.

What to look for in a fold-out sofa bed

The best fold-out sofa bed handles sitting and sleeping equally well. Here's what matters.

• Seat depth. Deeper seats are better for lounging and sleeping. The Koala Sofa Bed [4th Gen] has plush 60 cm seats with a perfectly angled backrest and lumbar support — around 11% deeper than the previous generation, so there's more room to stretch out.
• A proper integrated mattress. Top-tier fold-outs include a built-in comfort layer, not a bare fabric base. Koala uses Kloudcell™ — an open-cell foam from what Koala calls Australia's most awarded mattress range — as a full-size integrated topper, delivering support, breathability and responsiveness rather than the lumpy feel of an older fold-out.
• Zoned support. The 4th Gen uses built-in zoning: softer where you want it, firmer where your back needs it, with the backrest set at a natural recline angle for long evenings on the sofa.
• Machine-washable covers. A sofa bed pulls double duty, so covers that zip off and wash at home are a real advantage.
• Life-proof, water-resistant fabric. Most of the 4th Gen's fabrics are washable and water-resistant, so everyday spills wipe away rather than soak in (the two Cord finishes, Sandstone and Coastal Moss, are washable but not water-resistant).
• Single-motion conversion. FlipBed™ needs no tools, no lifting and no locking. One move and you're done.
• Sustainable materials. Look for responsibly sourced timber and recycled content. Koala uses an FSC®-certified poplar-plywood and MDF frame, cover fabrics with recycled polyester content (from around a third up to 100%, depending on tier), and is a certified B Corp and 1% for the Planet member.

Fold-out sofa bed sizes explained

UK sofa beds are sold by how many they seat, but you should also check how many they sleep. Koala's three sizes line up like this:

Because the fold-out reveals a full-size mattress rather than a thin pad, the 3-Seater sleeps at a genuine King width — unusual in a sofa that footprints like a normal three-seater.

Browse by size: Single sofa beds · Double sofa beds · 3-Seater sofa beds. Tight on room? See space-saving sofa beds.

Fold-out sofa bed dimensions & measurements

Check three numbers before you buy any fold-out sofa bed: sofa width, the floor space it needs open as a bed, and the longest delivery box. Get one wrong, and you're arranging a return.

The figures below are for the flagship Koala Sofa Bed [4th Gen] — 3-Seater (King). The 1.5- and 2.5-Seater are narrower; exact figures for every size are on the product page.

*Product-page spec figure; Koala markets the seat cushion as "60 cm deep," around 11% deeper than the previous generation.

Floor space is the number people overlook. In bed mode, the 3-Seater needs about 222.5 cm of clearance from the wall — measure your room before you measure the sofa.

Delivery and doorways. The Koala Sofa Bed ships flat-packed in five boxes (total ≈ 85.5 kg for the 3-Seater). The longest box is around 162 cm and the heaviest about 24.5 kg. Measure your longest clear run — hallway, stairwell, tight turns — against the individual box sizes on the product page before ordering. Full box dimensions and weights are listed there.

Materials & fabric guide

The fabric your fold-out sofa bed wears every day matters as much as the foam underneath it. The Koala Sofa Bed [4th Gen] comes in three fabric tiers across eight finishes:

• Classic — Cinnamon Sky, Olive Butter, Morning Fog. Washable and water-resistant.

• Cord (corduroy) — Sandstone, Coastal Moss. A textured look; note these two are not water-resistant.

• Luxe — Moonlit Silver, Forest Dawn, Silver Sand. A premium, refined weave.

All covers are removable and machine-washable, use fabrics with recycled polyester content, and carry PFAS-tested treatments. Under the covers: an FSC®-certified poplar-plywood and MDF frame, polyurethane support and comfort foam wrapped in a polyester wadding layer, and the full-size Kloudcell™ topper.

How to care for a fold-out sofa bed

Fold-out sofa bed care is about consistency, not complexity.

• Weekly. Vacuum on low suction to lift dust from the cushions and sleep surface, and keep the sofa out of direct sunlight.
• Spills. Blot immediately with a clean, dry cloth — don't rub, and skip harsh chemicals. Water-resistant fabric slows absorption; it isn't waterproof (and the two Cord finishes aren't water-resistant at all).
• Covers. The removable covers machine-wash — follow the care label on your specific fabric. Reshape while damp and line dry in shade; no tumble drying.
• Foam and linings. Never saturate the foam. Spot clean linings only.
• Heat. Keep the sofa away from open flames and uncovered heat sources.

Still deciding? The Innovation page explains how FlipBed™ and Kloudcell™ work, and the sofa beds collection lets you compare finishes side by side.

Is a fold-out sofa bed worth it?

If your sofa bed will mostly be a sofa with occasional overnight duty, a fold-out flip is usually the best value: you get everyday sofa comfort, a full-size mattress for guests, and none of the metal-bar backache that dogs cheaper action frames. For daily sleeping, prioritise seat depth, a genuine integrated mattress and washable covers — the areas budget models cut. A 120-day trial matters too: it's the best way to know a sofa bed suits you across a full sleep cycle, not just a showroom sit.

Complete the set: the Koala Sofa Bed Ottoman

The Koala Sofa Bed Ottoman is the sofa bed's natural companion — seat, footrest, storage and side table in one small footprint. It works as a footrest and extra seat, hides clutter in its under-lid storage, and has a flippable top that turns it into a side table in seconds. Use it as a max-5 kg side table or flip it back to soft-topped seating.

It comes in the same eight Koala finishes as the sofa bed, uses the same FSC®-certified timber frame and washable covers, and assembles tool-free. Its cushion uses CertiPUR-US® certified polyurethane foam. It ships in two boxes (largest ≈ 62 × 62 × 43 cm) and carries the same 120-day trial.

Koala Sofa Bed Ottoman — £270 (currently save £50). Hidden storage, flippable side-table top, eight finishes, tool-free assembly.

The ottoman is a standalone add-on, not a fixed chaise — buy it with the sofa bed or on its own.

Shop the Koala Sofa Bed Ottoman →

Ready to find your fold-out?

The Koala Sofa Bed [4th Gen] is designed by Koala in Australia and built for genuine sit-to-sleep comfort — Kloudcell™ foam, deep 60 cm seats, washable covers, tool-free assembly, and a 120-day trial with free delivery across most of the UK.

Koala Sofa Bed [4th Gen] — from £1,050 (currently save £200). Three sizes (1.5-Seater · 2.5-Seater · 3-Seater), eight finishes. FlipBed™ one-motion conversion. Full-size Kloudcell™ mattress. 5-year warranty.

Shop the Koala Sofa Bed → · Compare all sofa beds →

Frequently asked questions about fold-out sofa beds

How does a fold-out sofa bed work?

The backrest folds down flat over the seat to create one continuous sleeping surface — no separate mattress and no metal frame stored underneath. On the Koala Sofa Bed [4th Gen], FlipBed™ does this in one smooth motion in seconds, revealing a full-size mattress on a Kloudcell™ topper.

Is a fold-out sofa bed comfortable to sleep on?

Yes, when it has a proper integrated mattress. The 4th Gen builds in a full-size Kloudcell™ topper — an open-cell foam from what Koala calls Australia's most awarded mattress range — with zoned support that's softer where you want it and firmer where your back needs it, so there's no central bar to sleep around.

What sizes do fold-out sofa beds come in?

The Koala Sofa Bed comes in three sizes: 1.5-Seater (Single-width sleeping), 2.5-Seater (Double) and 3-Seater (King-width). Choose by how many people you seat day-to-day and how many need to sleep on it.

How much does a Koala fold-out sofa bed cost?

The Koala Sofa Bed [4th Gen] starts from £1,050 (with a current £200 saving) and rises with size and fabric tier, up to £1,395 for a Luxe 3-Seater. Check the product page for live pricing.

Does Koala deliver across the UK, and is it free?

Delivery is free to most of the UK, excluding Northern Ireland, the Scottish Highlands & Grampian, the Isle of Man, the Channel Islands, the Isles of Scilly, Scottish offshore islands and the Isle of Wight. Orders are typically ready to ship within 7 days. Every Koala sofa bed also comes with a free 120-day trial and a 5-year warranty.