A standard double bed in the UK measures 135 cm wide by 190 cm long, which is 4 ft 6 in by 6 ft 3 in in imperial. That is the size you will find on almost every double frame and mattress sold in Britain, and it has been the accepted standard for decades. Anything described as a small double is narrower at 120 cm, and anything wider than 135 cm moves into king territory at 150 cm.
Frames are always a little larger than the mattress they hold. Depending on the design, a double frame usually occupies between 143 cm and 160 cm of width and between 195 cm and 215 cm of length, because side rails, upholstery and footboards all add to the footprint. When you are measuring a room, work from the frame dimensions rather than the mattress size.
British sizing runs from single at 90 cm through small double at 120 cm, double at 135 cm, king at 150 cm and super king at 180 cm. The double sits in the middle and remains the most commonly bought size in the country, largely because it fits the average British bedroom without dominating it.
Split between two people, 135 cm gives each sleeper roughly 67 cm of width. That is narrower than a single mattress, which surprises many people. It works perfectly well for couples who sleep still, and it is generous for one person, but light sleepers sharing with a restless partner often notice the limitation.
The 190 cm length is the part of the specification worth checking carefully. Once a pillow is in place, the usable length drops to around 170 cm to 175 cm. Anyone approaching 185 cm tall will find their feet close to the end of the mattress.
UK doubles are only made at 190 cm, so there is no longer version. If length is the issue rather than width, moving up to a king at 150 cm x 200 cm is the practical answer, since kings and super kings both use the longer 200 cm mattress. Our modern double fabric beds UK range shows the standard length clearly in each specification, which makes comparison straightforward.
A double frame in a typical British bedroom needs floor space on the sides you actually use. Allow 60 cm along each side for comfortable access, and 70 cm at the foot if that route leads to a door or a wardrobe. With both sides accessible, a double needs a wall to wall width of around 255 cm to 270 cm to feel unhurried.
In smaller rooms, pushing one long side against a wall is a reasonable compromise, particularly in a guest room or a child’s room. You lose easy access on that side and making the bed becomes more awkward, but you gain useful floor area. Under 240 cm of wall to wall width, a small double at 120 cm often makes better sense than forcing a full double into the space.
Two frames holding the same mattress can take up very different amounts of room. Ottoman and storage frames tend to have thicker side rails to house the lifting mechanism, adding several centimetres each side. Upholstered frames with a padded surround add similar depth. Slim metal or minimal wooden frames sit closest to the mattress dimensions.
Headboard height also affects how a double reads in a room. A tall headboard draws the eye upwards and suits rooms with reasonable ceiling height. In a loft conversion or a room with a sloping ceiling, a low headboard keeps the proportions calm. Browsing the wider modern beds UK sale selection alongside your room measurements is the quickest way to see which frame style fits the space you have.
A UK double takes a double duvet at 200 cm x 200 cm and standard pillowcases at 50 cm x 75 cm. Fitted sheets are cut for a 135 cm x 190 cm mattress, and you should check the skirt depth against your mattress. Modern mattresses are often 25 cm to 30 cm deep, and older sheets designed for shallower mattresses will not stay in place.
Some couples buy a king duvet for a double bed, which gives more overhang on each side and reduces the tug of war during the night. It looks slightly oversized when the bed is made, so it is a comfort decision rather than a styling one.
Because a double leaves less spare floor area than people expect, storage planning matters. Under bed drawers or an ottoman lift turn the footprint you have already committed to into usable capacity. That is often more valuable than a larger chest of drawers that eats into the walkway.
Beside the bed, keep units narrow. A slim bedside cabinets UK sale option at around 40 cm wide preserves the 60 cm walkway that makes the room comfortable to move through. At the foot of the bed, a bench or a blanket box works only if the 70 cm clearance is genuinely there.
The small double at 120 cm x 190 cm has become popular in British homes for good reason. In box rooms and second bedrooms it gives a single sleeper considerably more room than a 90 cm single while still leaving space for a wardrobe and a desk.
For two adults sharing every night it is tight, giving each person 60 cm. As an occasional guest bed or a teenager’s bed, it is a sensible choice. Our small double wooden beds UK selection is worth comparing if your room measurements fall between the two sizes.
The frame carries the mattress, and how well it does that decides how long the mattress lasts. A double should have a centre support rail running the full length of the bed with at least one leg reaching the floor. Without it, the middle of a 135 cm mattress has nothing beneath it and gradually forms a dip along the line where two sleepers meet.
Slat spacing is the other detail worth checking. Gaps wider than about 8 cm allow foam and pocket sprung mattresses to press down between the slats, which causes uneven wear and can affect a mattress warranty. Sprung slats should always curve upwards. If an existing frame has widely spaced slats and you are fitting a new foam mattress, a base sheet or a few additional slats is a sensible precaution.
Access is worth checking before ordering rather than on delivery day. Measure the doorway width, the tightest turn on the staircase and the clearance on the landing. A 135 cm one piece sprung mattress can be difficult to turn in an older terraced house, whereas a rolled mattress unpacks in the bedroom itself and removes the problem entirely.
Flat packed frames rarely cause access difficulty, though a one piece upholstered headboard sometimes does, so check its carton dimensions as well. Assemble the frame in the bedroom rather than downstairs, because a built double frame will not pass through most internal doorways once it is bolted square.
Take three measurements before buying: the wall to wall width and length of the room, the clear width of the doorway, and the tightest turn on the stairs or hallway. Mark the intended frame footprint on the floor with masking tape and live with it for a day. It is a low effort test that reveals whether a door will still open fully and whether the radiator stays clear.
Also check ceiling and window heights against the headboard. A frame that fits the floor plan can still look wrong if the headboard cuts across a window sill. Our full bedroom range at Furniture in Fashion lists frame dimensions as well as mattress sizes, so you can plan properly before anything is delivered.
135 cm wide by 190 cm long, which is 4 ft 6 in by 6 ft 3 in. Frames typically occupy a little more than this once side rails and headboards are included.
It works well for many couples, giving each person about 67 cm of width. If either sleeper moves a lot during the night or is taller than around 185 cm, a king is worth considering.
Width only. A small double is 120 cm wide, a double is 135 cm wide, and both are 190 cm long. The 15 cm difference matters most when two people share.
A double duvet at 200 cm x 200 cm. Some people prefer a king duvet on a double for extra overhang, though it will look slightly oversized when made.
Around 60 cm on each side you use and 70 cm at the foot if it is a walkway. That usually means a room at least 255 cm wide for a bed with access on both sides.
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