Convertible Sofas: How to Pick the Right One for a Multifunctional Space

UK homes are among the smallest in Europe — research by LABC Warranty puts the average new-build at around 76 m² — and a dedicated spare room is a luxury many of us simply don't have. If your living room moonlights as a guest room — or your home office needs to sleep your in-laws twice a year — a convertible sofa is one of the smartest pieces of furniture you can buy. The trouble is that most of them are good at being a sofa or a bed, and quietly terrible at the other.

This guide explains the different types of convertible sofa available in the UK, how to get the size right for your space, and how to spot one that's genuinely comfortable to sleep on — not just to sit on.

In short: A convertible sofa (also called a sofa bed) folds or pulls out to become a bed. The main types are clic-clac, pull-out, futon-style and corner sofa beds. Choose a clic-clac for occasional guests on a budget, a pull-out with a proper mattress for regular use, and always check the unfolded bed dimensions — not just the sofa width — before you buy.

What Is a Convertible Sofa?

A convertible sofa is a sofa that transforms into a bed, usually by folding the backrest flat or pulling a hidden mattress out from under the seat. In the UK, you'll see the same piece of furniture called a convertible sofa, a sofa bed or occasionally a bed settee — they all mean the same thing.

What separates one convertible sofa from another isn't the name. It's the mechanism that does the converting, the size of the bed it creates, and the quality of the surface you end up sleeping on. Get those three things right, and one piece of furniture genuinely does the work of two.

Types of Convertible Sofa: Which Mechanism Suits You?

There are five main types of convertible sofa in the UK: clic-clac, pull-out, futon-style, corner sofa beds and chair beds. The right one depends on how often the bed will be slept in and how much floor space you can give it.

Clic-clac sofa beds

A clic-clac has a hinged backrest that folds flat in one movement — the name comes from the two clicks the mechanism makes. The seat and back become the sleeping surface, so conversion takes seconds and one person can do it easily. Clic-clacs are usually the most affordable option and suit occasional guest use. The trade-off: because you sleep directly on the seat cushioning, comfort depends entirely on the foam quality, and budget models can feel thin within a year or two.

Pull-out sofa beds

A pull-out sofa bed hides a folded mattress beneath the seat cushions, which you unfold onto a metal or wooden frame. Because the mattress is separate from the seat, a good pull-out sleeps more like a real bed — making it the better choice if guests stay regularly or someone will sleep on it most nights. Conversion takes a minute or two, and you'll need clear floor space in front of the sofa for the extended frame.

Futon-style sofa beds

A futon is the simplest design: a flexible mattress on a slatted wooden or metal frame that folds between sofa and bed positions. Futons are light, low-cost and easy to move, which makes them popular for studio flats and first homes. The firm, low-to-the-ground feel isn't for everyone, but if you like a firmer sleeping surface they're hard to beat for the money.

Corner sofa beds

A corner sofa bed combines an L-shaped corner sofa with a fold-out or pull-out bed, often with hidden storage in the chaise section for bedding. They create the largest sleeping area of any sofa bed and seat the most people by day, but they need a generous living room — as a rough guide, allow at least 220 cm along the longest wall, plus clearance for the bed.

Chair beds and single options

A chair bed is a single armchair or compact 2-seater sofa that folds out into a single bed. These are made for box rooms, home offices and garden rooms where a full-size sofa bed simply won't fit — some need less than 100 cm of wall space.

Comparison: convertible sofa types at a glance

How to Choose the Right Size (UK Dimensions Guide)

Always check two sets of measurements before buying: the sofa's footprint by day and the bed's footprint when unfolded. A sofa that fits your wall perfectly is no use if the open bed blocks the door.

Work through these three checks:

1. The room. Measure the wall where the sofa will sit, then measure the clear floor space in front of it. A clic-clac needs roughly 100 cm of clearance behind or in front when folded flat; a pull-out can extend 200 cm or more into the room. Mark the unfolded footprint on the floor with masking tape — it's the quickest way to see whether you can still open the wardrobe with the bed out. For more ways to make a compact room work harder, see our guide to small-space living ideas. [Editor: add Treetops link once slug confirmed in CMS]

2. The access route. Sofa beds are heavier and bulkier than standard sofas because of the mechanism. Measure every doorway, hallway turn and stairwell on the delivery route — the standard UK internal door is around 76 cm wide, and many older terraced houses and flats have tighter turns than that. Sofas that arrive in modular pieces or flat-packed boxes remove this headache entirely.

3. The bed size. UK sofa beds typically unfold to one of four mattress sizes:

If two adults will sleep on it regularly, treat a double (135 cm) as the minimum. A small double is fine for one adult or occasional couples.

Comfort Check: Sofa by Day, Real Bed by Night

The single biggest complaint about convertible sofas is sleep comfort — and it almost always comes down to the mattress. A sofa bed is only worth buying if you'd happily sleep on it yourself.

Here's what separates a good night's sleep from a bad back:

• Mattress depth and fill. As a rule of thumb, mattresses under about 10 cm tend to let you feel the frame beneath. Look for high-density foam or pocket-sprung fills rather than basic open-cell foam, which compresses quickly and never quite recovers.

• The frame. On cheaper pull-outs, a thin mattress over widely spaced metal bars creates the infamous "feel every bar" experience. Solid slats or a sprung base make a noticeable difference.

• Daily-use rating. Manufacturers typically rate clic-clacs and futons for occasional use — a handful of nights a month. If someone will sleep on the sofa bed most nights, choose one explicitly built for everyday sleeping, with a mattress to match.

This is where it pays to buy from a company that thinks about sleep first. Koala started as a mattress company, and the Koala Sofa Bed is designed by that same team — a proper sleeping surface rather than an afterthought hidden under the cushions, so guests don't draw the short straw.

Style, Fabric and Practicality

Choose a fabric and design you can live with every day, because a convertible sofa is your main sofa first and a bed second.

A few practical pointers UK buyers often overlook:

• Removable, washable covers are worth prioritising if you have children or pets — spills on a sofa bed are inevitable when it's used for movie nights and breakfast in bed.

• Built-in storage under the seat or chaise keeps the duvet, pillows and bedding within reach, so the spare room can be ready in two minutes — our guest room essentials checklist covers what to keep stashed.

• Legs and clearance matter for cleaning: around 15–20 cm of clearance lets a robot vacuum pass underneath.

• Neutral, durable upholstery ages better than fashion colours when a piece needs to suit a living room now and possibly a garden room or home office later.

How Much Should You Spend on a Convertible Sofa in the UK?

As a rough guide, expect to pay £150–£400 for a budget clic-clac or futon, £400–£900 for a solid mid-range sofa bed, and £900 upwards for a premium sofa bed designed for everyday sleeping.

Think in cost-per-use rather than ticket price. A £250 clic-clac used five nights a year is excellent value. The same sofa used five nights a week will sag within a year, and you'll buy twice. For regular use, a £900+ sofa bed with a proper mattress, a solid warranty and durable upholstery is usually the cheaper option over five years.

Two things justify spending more: a real mattress (not just thicker seat foam) and a meaningful warranty. A long warranty on the frame and mechanism is the clearest signal a manufacturer expects the sofa to survive daily converting.

Why Choose a Koala Sofa Bed

A Koala sofa bed is designed by sleep specialists, which solves the core problem most convertible sofas have: the bed part is an afterthought.

In practice, that means Koala's FlipBed™ fold-out design — no mechanical frame, so there are no bars to feel through the sleeping surface — plus tool-free, slide-and-click assembly that takes minutes rather than an afternoon (and removes the narrow-doorway problem, because it arrives in manageable boxes), free delivery across most of the UK (exclusions apply, including Northern Ireland and the Scottish Highlands), a 120-day free trial with free return pickup, and a 5-year warranty — so you can test the sofa-by-day, bed-by-night promise in your own living room rather than a showroom. Koala also backs its furniture with sustainability credentials, from responsibly sourced materials to its support for wildlife conservation.

If you're weighing up options, start with the Koala Sofa Bed range and compare the mattress spec against anything else on your shortlist.

Not sure where to start?

Not convinced a sofa bed can sleep like a proper bed? The Koala Sofa Bed comes with a 120-day free trial, so you can find out in your own flat — and Koala collects it free of charge if it doesn't win you over.

 

Convertible Sofa FAQs

What's the difference between a convertible sofa and a sofa bed?

Nothing meaningful — in the UK, the two terms describe the same thing. "Convertible sofa" simply emphasises that the sofa converts into a bed. The differences that actually matter are the mechanism (clic-clac, pull-out, futon) and the mattress quality.

Can you sleep on a convertible sofa every night?

Yes, provided it's designed for everyday use with a supportive mattress of around 10 cm or more. Budget clic-clacs and futons are typically rated for occasional guests and tend to sag under nightly use.

What sizes do convertible sofa beds come in?

UK convertible sofas typically unfold to a single (90 cm), small double (120 cm), double (135 cm) or king (150 cm). Always check the unfolded bed dimensions rather than the sofa width.

Which mechanism is easiest to convert?

A clic-clac is the fastest — the backrest folds flat in seconds with one hand. Pull-out sofa beds take a minute or two but generally sleep better because the mattress is separate from the seat cushions.

Will a convertible sofa fit in a box room?

Often, yes. A chair bed needs less than 100 cm of wall space, and compact 2 seater clic-clacs fit rooms under 3 m wide. Tape out the unfolded bed footprint on the floor before you buy.

Are convertible sofas worth it?

For homes without a spare room, a well-made convertible sofa replaces two pieces of furniture and effectively adds a guest room to your flat. The value depends on build quality: buy once, buy well, and check the warranty covers the mechanism.

The Bottom Line

The right convertible sofa comes down to three decisions: the mechanism (clic-clac for occasional use, pull-out for regular sleepers), the size (check the unfolded footprint and the UK bed size, not just the sofa width), and the mattress (10 cm minimum, high-density foam or springs). Get those right and one piece of furniture gives you a living room by day and a genuinely comfortable guest room by night.

Ready to see how a sleep-first sofa bed compares? Shop the Koala Sofa Bed — and turn your living room into a guest room that's ready in under a minute.