Single Sofa Beds: Best Options for Spare Rooms and Compact Spaces

A single sofa bed is one of the hardest-working pieces of furniture you can own. By day, it's a comfortable armchair-sized seat; by night, it unfolds into a bed for one — without claiming a centimetre more floor space than it needs. If your spare room doubles as a home office, or your flat doesn't have room for a full guest bed, a single sofa bed solves the problem in a way a blow-up mattress never will.

This guide covers everything you need to choose well: exact dimensions, the differences between a single sofa bed and a chair bed, the fold-out mechanisms worth having, and how to make sure the one you buy is actually comfortable to sleep on.

What Is a Single Sofa Bed?

A single sofa bed is a one-seater sofa or wide armchair that converts into a bed for one person. It gives you two pieces of furniture in the footprint of one, which is why it's the go-to choice for spare rooms, home offices and studio flats.

You'll see a few similar terms used across UK retailers, and they aren't quite interchangeable:

The practical difference is sleeping comfort. A futon and most chair beds have you sleeping directly on the seat cushions, while a proper single sofa bed houses a separate fold-out mattress — generally the more comfortable option, particularly for regular use.

Single Sofa Bed Dimensions: Will It Fit?

Most single sofa beds measure 90–130cm wide when closed and open out to a sleeping area of around 75–90cm x 180–190cm — close to, but not always matching, a standard UK single mattress at 90cm x 190cm.

That last point matters more than most product pages admit. If the sleeping surface is narrower than 90cm, standard single fitted sheets won't fit properly, and taller guests may find anything under 190cm long restrictive.

Use this as your measuring checklist:

Quick rule: measure the wall space for the closed sofa, then measure again for the open bed plus 30cm of walking room. If both fit, you're set.

Best Places to Use a Single Sofa Bed

A single sofa bed works best in rooms that need to do two jobs — most commonly a spare room that's also an office, a studio flat, or a child's bedroom.

Spare room and home office. This is the classic use case. A desk and a full bed rarely fit in a box room, but a desk and a single sofa bed do. You get a reading chair for everyday use and a sofa bed for overnight guests the few nights a year you need one.

Studio and one-bed flats. When your living room is also your bedroom — or your only spare sleeping space is the living room — a sofa bed for a small flat gives visiting friends somewhere proper to sleep without a permanent bed dominating the room.

Kids' rooms. A sofa bed for kids handles sleepovers neatly and gives the room a sofa for reading or gaming the rest of the time.

Garden rooms and annexes. Insulated garden offices and summer houses increasingly moonlight as guest rooms, and a single sofa bed is usually the only bed format that fits sensibly alongside a desk.

How to Choose a Single Sofa Bed

The four things that separate a good single sofa bed from a frustrating one are the mechanism, the mattress, the fabric and the assembly. Get those right, and the rest is styling.

Mechanism: click-clack vs fold-out vs pull-out

If guests will stay more than a night or two at a time, prioritise a pull-out design with a real mattress over a click-clack you sleep on top of.

Mattress comfort

Mattress depth is the quickest quality signal: 8cm foam is fine for a night, 12–14cm is noticeably better for a week. Look for high-density or pocket-sprung fillings rather than basic foam, and check whether the mattress is removable — it makes airing and cleaning far easier.

Fabric

Polyester weaves are hardwearing and stain-resistant; velvet looks premium but shows marks; removable, washable covers are worth seeking out for kids' rooms. If the sofa bed will sit in direct sunlight, ask about fade resistance.

Assembly and delivery

Many single sofa beds arrive flat-packed. Check whether tools are required, whether it fits through your door and hallway boxed (most do — that's an advantage of the format), and whether the retailer delivers to room of choice.

Why a Koala Sofa Bed Is Different

Most sofa beds compromise on the bed half of the equation — Koala doesn't. Koala sofa beds are built around the same comfort thinking behind Koala's mattress design, so the sleeping surface is designed for real sleep, not just emergencies.

The Koala Sofa Bed 1.5 seater is the single option: a compact sofa that opens into a single bed with a full-size integrated mattress, so guests sleep on a proper sleep surface — not seat cushions. The removable Kloudcell™ topper zips off for washing, and assembly needs no tools at all: parts slot, screw or zip into place with alignment guides and coloured tabs, no Allen keys or screwdrivers required.

For planning your space, the 1.5 seater has a 46cm seat height, 58cm arm height and 63.34cm seat depth, and extends to 222.5cm deep when opened into a bed — so measure from the wall it'll sit against to make sure the open bed clears furniture and doorways.

Beyond the mattress, two things take the risk out of buying. The 120-night trial lets you test it with real nights' sleep at home — if it's not the right fit, Koala collects it free of charge and refunds the full purchase price. And the 5-year warranty covers manufacturing and material defects from the day it's delivered.

Delivery is free too — Room of Choice service across England, Scotland and Wales (some remote postcodes excluded), with a three-hour delivery window confirmed the evening before. Browse the full Koala sofa bed range, or add the matching ottoman for extra storage and lounging.

Single vs Double Sofa Bed: Which Size Do You Need?

Choose a single sofa bed if only one person will ever sleep on it and space is tight; choose a 2 seater sofa bed or double if couples will stay or you want more everyday seating.

A useful test: if the room can take 140cm of sofa width without crowding the door or radiator, the double is usually the better long-term buy because it doubles as proper living room seating. If it can't, the single is the right call — a cramped room with a big sofa bed is worse than a comfortable room with a smaller one. The Koala Sofa Bed comes in 1.5 seater (single), 2.5 seater (double) and 3 seater (king) sizes, so you can match the bed size to the room rather than compromise.

Not sure it'll fit or feel right? Every Koala sofa bed lists its exact open and closed dimensions, and comes with a 120-night trial — test it with real nights' sleep, not a five-minute sit, and if it's not right, collection and refund are free. Shop Koala single sofa beds

Single Sofa Bed FAQs

What size is a single sofa bed when opened out?

Most open to a sleeping area of 75–90cm wide by 180–190cm long. A standard UK single mattress is 90cm x 190cm, so check the listed sleeping dimensions — not just the sofa dimensions — before you buy.

What's the difference between a single sofa bed and a chair bed?

A chair bed is an armchair (usually 75–95cm wide) whose seat folds flat to become the bed, so you sleep on the cushions. A single sofa bed is slightly wider and usually contains a separate fold-out mattress, which generally sleeps better.

Are single sofa beds comfortable enough for everyday sleeping?

A well-made one with a proper mattress — 12cm or deeper, high-density foam or pocket springs — can handle regular use. Budget click-clack designs are best kept for occasional guests, as seat cushions compress and soften with nightly sleeping.

Can I use standard single fitted sheets on a sofa bed?

Only if the sleeping surface is close to 90cm x 190cm. Many single sofa beds open to 75–80cm wide, in which case standard single fitted sheets will be baggy; a flat sheet tucked under is the practical workaround.

How much space do I need to open a single sofa bed?

Allow 100–120cm of clear floor in front of the sofa for fold-out and pull-out designs, plus around 30cm of walking space beside the bed. Click-clack designs need clearance behind instead, as the backrest drops down.

How long does a single sofa bed last?

A quality hardwood-framed single sofa bed typically lasts around 8–10 years with occasional use. The mattress or cushions usually wear out before the frame, so removable, replaceable mattresses extend the lifespan considerably.

Make Any Room a Guest Room

The right single sofa bed turns a box room, office corner or studio flat into a genuine guest room in under a minute — and gives you a comfortable seat the other 360 days a year. Measure your closed and open space, choose a mechanism that matches how often it'll be slept on, and don't compromise on the mattress.

Ready to see how comfortable a sofa bed can actually be? Explore Koala sofa beds — free Room of Choice delivery across England, Scotland and Wales (some remote postcodes excluded), with every dimension listed so you know it fits before it arrives.