The standard width of a double bed in the UK is 135cm, which is 4ft 6in. The mattress length that goes with it is 190cm, or 6ft 3in. Those figures apply to the mattress; the frame will be wider, generally by five to fifteen centimetres in total depending on how the bed is built.
Width is the number that changes most across the British bed range, so it is the one worth understanding properly. Single, small double and double beds all share the same 190cm length. What separates them is purely how wide they are.
Divide 135cm between two adults and each person has 67.5cm. For context, a UK single mattress is 90cm wide, so two people on a double have noticeably less width each than a single sleeper would.
That is not a criticism of the size. A double is the most common bed in Britain for good reason: it fits the majority of bedrooms and suits most couples perfectly well. But the arithmetic explains why partner disturbance is more noticeable on a double than on a king, and why people who move a lot in their sleep often feel the difference straight away.
If you want a rough test at home, measure 67.5cm on the floor with a tape and lie within it. It is a more informative exercise than reading dimensions on a page.
The widths run as follows. Single: 90cm. Small double, also called a three quarter bed: 120cm. Double: 135cm. King: 150cm. Super king: 180cm.
Notice the gaps. The step from small double to double is fifteen centimetres, and from double to king another fifteen. Those increments sound modest but they are the difference between a bed that feels tight and one that feels settled when shared.
Length only changes at king size, moving from 190cm up to 200cm. So if your reason for upgrading is height rather than width, a king or super king is the only route.
People plan rooms around the 135cm figure and then find the bed does not fit the alcove. The external frame is always wider than the mattress it holds.
Thin metal frames add the least, sometimes only a few centimetres in total. Timber frames with substantial side rails add more. Upholstered frames with padded surrounds add the most, and a heavily padded bed taking a 135cm mattress can measure over 150cm externally, which is as wide as a bare king mattress.
That difference decides whether a bed fits between a chimney breast and a wall, or into an alcove. Always find the stated external width. Among our modern double fabric beds UK sale selection the padded surrounds vary considerably, so it is worth comparing two or three before committing.
A double bed needs more than 135cm of wall. Allow at least 70cm of clear walkway on each side you plan to use, and 90cm where a wardrobe or cupboard door has to swing open into that space.
With access on both sides, that puts the minimum comfortable room width at roughly 2.8 metres. With one side against a wall, you can manage in about 2.1 metres, accepting that changing the bedding means walking round to the foot each time.
Do not forget skirting boards, which reduce usable floor width by a couple of centimetres each side, or radiators, which often dictate bed position more than anything else. Older British homes rarely have square rooms, so measure the wall at both ends and work from the smaller figure.
If your room is genuinely tight, the 120cm small double is worth considering rather than squeezing in a full double. Fifteen centimetres of reclaimed floor width can be the difference between a wardrobe door that opens and one that does not.
The compromise is real: 120cm split between two adults gives 60cm each, which most couples find too narrow for regular use. As a bed for one adult who wants more room than a single, or for a teenager, or for a guest room that sees occasional double occupancy, a small double is a sensible choice.
The other consideration is bedding availability. Double bedding is stocked everywhere; small double bedding is less widely available and the choice of designs is narrower.
Once the width question is answered, style determines how large the bed feels. Low frames with slim headboards leave more visible wall and help a small room breathe. Tall headboards add reading comfort but dominate the wall.
Solid timber options among our modern wooden beds UK sale range bring warmth and durability, though the rails are usually chunkier. If floor space is at a premium, an ottoman or lift up frame turns the area beneath the mattress into usable storage, which in a bedroom without fitted cupboards is often the most valuable feature a bed can offer.
Keep the surrounding pieces slim so the walkways you measured survive. Narrow modern bedside cabinets UK sale protect the gap beside the bed, and a tall narrow chest holds as much as a wide low one while occupying less floor. If wardrobe space is short, modern sliding wardrobes UK avoid the swing clearance that hinged doors demand, which can be the deciding factor in a room already filled by a double bed.
At Furniture in Fashion we publish full external dimensions across our bed range so the planning stage is straightforward, and free delivery to most UK mainland postcodes applies.
UK double bedding is cut for a 135 by 190 mattress. Fitted sheets state a pocket depth, and this is where deep mattresses cause difficulty: anything over about thirty centimetres deep needs an extra deep fitted sheet or the corners will lift overnight.
Double duvets measure 200cm by 200cm, giving generous overhang either side of a 135cm bed. Some couples prefer a king duvet on a double for extra coverage, and since the duvet does not need to match the mattress width, that works without any problem.
The width of a double bed has a direct bearing on how the base must be built. Slats spanning the full 135cm from one side rail to the other will flex under load over time unless a central rail runs down the length of the bed, usually carrying one or two legs to the floor.
Most well made double frames include that central support as standard, but it is worth confirming, especially on very inexpensive frames or second hand ones. A base without it develops a shallow trough along the middle, and no mattress compensates for a base that has lost its shape.
Slat spacing matters alongside it. Gaps wider than about seven or eight centimetres let the mattress sag into them, which shows as uneven support after a year or two and can invalidate some mattress warranties. Sprung slats, curved slightly upward, add a little give and generally outperform flat rigid boards.
If you are replacing only the mattress, assess the base honestly first. A new mattress on a tired base will underperform, and the fault usually gets blamed on the mattress.
Width influences more than the space you occupy while asleep. At 135cm, two sleepers are close enough that movement transfers readily between them unless the mattress is built to limit it. Pocket sprung mattresses, where each spring sits in its own fabric pocket and compresses independently, handle this far better than open coil constructions where the springs are wired together and move as one unit.
Memory foam and hybrid mattresses also absorb movement well, which is why they come up so often in advice for couples sharing a double rather than a king. The narrower the bed, the more work the mattress construction has to do.
Firmness choice becomes trickier on a double too. On a king or super king, some couples buy zip and link mattresses so each side can have a different tension. That option does not exist at 135cm, so partners with very different weights or firmness preferences have to compromise on a single tension across the whole bed. A medium tension pocket sprung mattress is usually the safest middle ground where preferences differ.
For one adult, 135cm is generous. For two adults sharing nightly, it is workable but not spacious, and the step up to a king at 150cm is the most common upgrade for exactly that reason.
The test is simple. Measure the room, mark the frame footprint on the floor with masking tape including the external width rather than the mattress width, and walk the walkways. If a king fits without blocking a door or losing the storage you need, it is worth considering. If it does not, a double is the right size and forcing a larger frame in will cause daily irritation.
Yes. A UK standard double is 135cm wide, which converts to 4ft 6in, and 190cm long, which is 6ft 3in. Both sets of figures describe the same size.
67.5cm each when shared by two adults, which is less than the 90cm width of a UK single mattress. This is why partner disturbance is more noticeable on a double.
No. Width varies by country, and a bed sold as a double elsewhere may be a different size. Always check the measurement in centimetres rather than relying on the name.
A double is 135cm wide and a small double is 120cm. Both are 190cm long. The small double suits tight rooms and single sleepers who want extra space, but it is narrow for two adults.
Yes. Frames add roughly five to fifteen centimetres overall, with upholstered surrounds adding the most. Use the stated external dimensions when planning the room.
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