Best King Size Ottoman Beds UK: Sizes, Storage & How to Choose
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Last updated: August 2026
A king size ottoman bed measures 5ft (150cm) wide by 6ft6 (200cm) long and is the most popular choice for UK main bedrooms. It gives roughly 17% more storage area than a double, and because a king mattress is heavier, the gas struts must be rated to match — that rating is the single most important spec to check at this size.
King size ottoman bed dimensions
A UK king size mattress is 150cm x 200cm (5ft x 6ft6). That is 15cm wider and 10cm longer than a standard double. The frame itself will be slightly larger than the mattress — usually 5–10cm on each side depending on the headboard and upholstery depth — so measure the external frame dimensions, not the mattress size, when checking it fits.
How much storage does a king size ottoman bed have?
The storage well runs the full footprint of the base. Comparing mattress footprints directly:
| Size | Dimensions | Footprint | vs double |
|---|---|---|---|
| Small double (4ft) | 120 x 190cm | 2.28 m² | ~11% less |
| Double (4ft6) | 135 x 190cm | 2.57 m² | — |
| King (5ft) | 150 x 200cm | 3.00 m² | ~17% more |
| Super king (6ft) | 180 x 200cm | 3.60 m² | ~40% more |
In practical terms a king well comfortably holds a full spare bedding set, a winter duvet and several storage bags at once.
What room size do I need for a king size ottoman bed?
Allow the frame footprint plus around 70cm of walking space on any side you need to access. The more commonly missed requirement is vertical clearance: an ottoman base lifts to near-vertical, so check that no window sill, radiator, shelf or sloped ceiling sits inside the arc of the opening base.
Do king size ottoman beds need stronger gas struts?
Yes. A king mattress is heavier than a double, so the struts need a correspondingly higher Newton (N) rating to lift it. Struts that are underrated won't hold the base up; struts that are overrated will push a light mattress back open. The rating is printed on the strut barrel — see our gas strut replacement guide.
What to look for in a king size frame
- Solid timber frame — wider frames flex more, so joint strength matters more at king size than at single or double
- Dual struts, rating printed — two struts share the heavier load and stay balanced
- Deck type — a solid platform deck is required by most memory foam and hybrid mattress warranties
- Guarantee — 5 years or more, covering the period when strut and frame faults appear
- Fire label — UK beds must meet the Furniture and Furnishings (Fire) (Safety) Regulations 1988 and carry a permanent label
King size vs super king
A super king adds 30cm of width and about 20% more storage area again. It suits larger main bedrooms; in a typical UK room a king usually leaves more usable floor space. See our super king guide.
Frequently asked questions
What are the dimensions of a UK king size bed?
150cm x 200cm, or 5ft x 6ft6. This is wider and longer than a UK double (135cm x 190cm).
Is a king size ottoman bed worth it over a double?
If the room fits it, yes — you gain 15cm of sleeping width per person and around 17% more storage area for the same mechanism and effort.
What mattress fits a king size ottoman bed?
Any standard UK king (150cm x 200cm) mattress. Check the mattress weight suits the frame's strut rating, and use a solid platform deck for memory foam or hybrid.
How much does a king size ottoman bed weigh?
Frame weight varies with construction, but a solid timber king frame is heavy enough that assembly is a two-person job. See how to assemble an ottoman bed.
Shop our king size ottoman bed range.
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Shop King Size Ottoman BedsRelated reading
See our full ottoman bed sizes guide and what makes a good ottoman bed. Browse king size ottoman beds or the full ottoman bed range.