Queen Size Sofa Bed: The Complete UK Buying Guide (2026)

A queen size sofa bed gives two adults enough room to sleep comfortably while taking up no more space than a sofa during the day. For guest rooms, living rooms, and small flats where a dedicated spare bed is not practical, it is often the most sensible solution.

This guide covers the key decisions: dimensions, mattress quality, the bar problem, fabric care, and how the Koala Sofa Bed [4th Gen] compares.

What is a queen size sofa bed?

A queen size sofa bed is a sofa that converts into a sleeping surface wide enough for two adults. During the day it functions as normal seating; when guests stay, it opens into a bed.

"Queen size" is not a standard UK mattress category. UK sizes run: single (90 × 190 cm), small double (120 × 190 cm), double (135 × 190 cm), king (150 × 200 cm), and super king (180 × 200 cm). A queen size sofa bed typically falls between king and super king — more space than a double, without the full footprint of a super king. You may also see "queen sleeper sofa" (an American term); in the UK, "sofa bed" is standard.

How big is a queen size sofa bed?

The Koala Sofa Bed [4th Gen] opens to 178 cm (3-Seater King) or 162.5 cm (2.5-Seater Double) and extends 222.5 cm in depth when fully open — plan for at least 12–14 m² of clear floor space.

*Room size estimates based on open depth plus walking clearance — not Koala specifications. Measure your room before ordering.

Before buying, mark the full open depth on your floor with masking tape. Check: can someone walk safely through the room when the bed is open? Does opening it block a door or wardrobe?

Queen size sofa bed vs UK mattress sizes

A queen size sofa bed (150–178 cm wide) sits between a UK king (150 cm) and super king (180 cm) — considerably wider than a standard double (135 cm).

Can you feel the bar in a queen size sofa bed?

In traditional pull-out sofa beds, a metal support bar runs beneath the folded mattress — and through a thin foam layer, some sleepers feel it. Whether you notice depends on mattress thickness and mechanism design.

In a standard fold-out sofa bed, the mattress folds in thirds over a metal hinge frame. After a few hours, the bar becomes noticeable, especially for lighter sleepers or anyone in the middle of the mattress.

The Koala Sofa Bed [4th Gen] uses FlipBed™ technology instead. The back of the sofa flips down to form the sleeping surface — no pull-out frame, no bar structure. The full-size Kloudcell™ foam topper further cushions the surface without the pressure points of thin fold-out mattresses. If you already own a traditional sofa bed where bar pressure is an issue, a 5–8 cm memory foam topper placed on top is the most effective workaround.

What type of mattress is in a queen size sofa bed?

Most sofa beds use either foam or pocket spring mattresses. The Koala Sofa Bed [4th Gen] uses Kloudcell™ — an open-cell foam designed to balance the contouring feel of memory foam with improved airflow.

Foam mattresses are lightweight and quiet, which aids conversion. Quality varies significantly: lower-density foam compresses over time; look for foam that holds its shape rather than one that softens quickly. Pocket spring mattresses offer better airflow and a sleep experience closer to a conventional bed, but add weight to the conversion.

Kloudcell™ is Koala's own open-cell foam, integrated into the sofa bed as a full-size topper that zips off for cold machine-washing. Zero Disturbance™ technology isolates motion between sleepers — useful for couples or two guests sharing the bed over several nights.

What to look for before buying

The best queen size sofa bed balances mattress quality, conversion ease, fabric care, and room fit.

Mechanism: The two designs you will encounter are the FlipBed™ (Koala) — back flips down in a single motion, no bar — and the traditional fold-out, where a mattress extends over a metal frame. If one person will operate the sofa bed alone, ease of solo conversion matters as much as sleeping comfort.

Fabric care: Removable covers vary significantly. The Koala Sofa Bed [4th Gen] cover care by fabric:

The Kloudcell™ sleep surface topper is cold machine-washable across all fabric ranges. Always follow the care label before washing.

Bedding storage: Pillows, a duvet, and sheets need somewhere to go during the day — particularly relevant in smaller rooms. The Koala Sofa Bed Ottoman (£320) provides hidden storage under the lid and doubles as a side table.

Which queen size sofa bed does Koala offer in the UK?

The Koala Sofa Bed [4th Gen] is available in three sizes and holds a 4.9-star rating from over 1,600 reviews.

*Excludes Northern Ireland, Scottish Highlands & Grampian, Isle of Man, Channel Islands, Isles of Scilly, Scottish Offshore Islands, and Isle of Wight.

For everyday fabric and water-resistance advice, Classic and Luxe are the practical choice for households with pets or young children — both are water-resistant. Cord (Sandstone and Coastal Moss) is not water-resistant.

The Koala Sofa Bed Ottoman (59.5 cm wide × 41 cm tall, £320) pairs with the sofa bed and includes hidden storage under the lid and a flippable top that serves as a side table (5 kg max). Ottoman covers are cold machine-washable at max 30°C across all fabrics.

For most UK homes, the King (3-Seater) offers the most generous sleeping surface without needing a large room. The Double (2.5-Seater) suits tighter spaces or a tighter budget. For a single guest, the single sofa bed range is a compact alternative.

Care and longevity

Regular vacuuming, prompt spill treatment, and correct mechanism use will keep a queen size sofa bed performing well for years. The Koala Sofa Bed [4th Gen] carries a 5-year warranty.

Vacuum on a low setting weekly. Blot spills immediately — do not scrub. Classic and Luxe water-resistant covers bead most liquids; Cord fabrics absorb them, so act fast. For full washing instructions by fabric, see the table in the buying guide section above.

For the FlipBed™ mechanism: never force it. If it feels stiff, check for fabric caught in the hinge. Periodically check that fixings are secure — a loose joint is the most common source of squeaking.

Is a queen size sofa bed right for a small flat?

A queen size sofa bed can work well in a small flat provided the room has at least 12–14 m² and 222.5 cm of clear depth in front of the sofa.

For daily conversion in a studio flat, ease of solo operation matters more than anything else. The FlipBed™ mechanism is designed for quick solo use — no heavy lifting or unfolding. Consider where bedding will be stored during the day; the Koala Sofa Bed Ottoman helps here.

If space is genuinely tight, a double sofa bed or space-saving sofa bed may be the better fit — prioritising room practicality over sleeping width.

Frequently asked questions

What size is a queen size sofa bed in the UK?

A queen size sofa bed typically opens to 150–178 cm wide — between a UK king (150 cm) and super king (180 cm). The Koala Sofa Bed [4th Gen] opens to 178 cm (3-Seater King) or 162.5 cm (2.5-Seater Double). Always check the product specification, as dimensions vary between brands.

Can you feel the bar in a queen size sofa bed?

In traditional fold-out sofa beds with thin mattresses, the support bar can be felt during sleep. The Koala Sofa Bed [4th Gen] avoids this with its FlipBed™ mechanism — no pull-out frame, no bar. If you use a different sofa bed where bar pressure is an issue, a 5–8 cm memory foam topper placed on top is the most effective fix.

What mattress does the Koala Sofa Bed [4th Gen] use?

A full-size Kloudcell™ open-cell foam mattress with an integrated plush topper. It is designed to balance contouring support with airflow — keeping sleepers cooler than standard memory foam. The topper zips off and is cold machine-washable.

How do I wash the Koala Sofa Bed covers?

Classic and Luxe covers are hand-wash only — do not machine wash. Cord covers (Sandstone and Coastal Moss) can be cold machine-washed separately from other colours; do not bleach or tumble dry. The Kloudcell™ topper is cold machine-washable across all fabrics. Always check the care label.

How much does the Koala Sofa Bed cost in the UK?

The Koala Sofa Bed [4th Gen] starts from £1,196 — 3-Seater (King) £1,196, 1.5-Seater (Single) £1,250, 2.5-Seater (Double) £1,395 — with free delivery to England, Scotland & Wales. See the product page for current pricing across all fabric options.

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The Koala Sofa Bed [4th Gen] is available with free delivery to England, Scotland & Wales and a 120-day trial. If it is not right for your home, Koala will collect it free of charge and provide a full refund — including any delivery charges. See the full product details here.