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A small double bed measures 120cm wide by 190cm long. In imperial terms that is 4ft by 6ft 3in, or 48 inches by 75 inches. UK retailers sometimes list the same size as a three quarter bed, and occasionally as a 4ft bed. All three names describe the same mattress.
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Those figures apply to the mattress. The frame will be larger, and the difference varies by design, which is the single most useful thing to understand before ordering.
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Placed alongside the other UK standard sizes, the small double fills a real gap:
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So it is 30cm wider than a single and 15cm narrower than a double. Length is identical to both at 190cm, so this is purely a width decision. A tall sleeper gains nothing from a small double over a single as far as legroom goes.
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That 15cm saving against a double is more meaningful than it sounds in a narrow room. It is often the difference between a wardrobe door that opens fully and one that catches on the bed rail.
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The mattress is 120cm wide. The frame will typically measure:
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Length behaves the same way. A 190cm mattress sits inside a frame that may be 197cm to 205cm long once a headboard is attached, and longer again if there is a footboard. If the bed is going into an alcove or between a chimney breast and a wall, work from the overall frame figure on the product page and leave a little tolerance at each end.
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Small doubles are not a general purpose size. They solve specific problems, and they solve them well:
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Second bedrooms in modern new builds. Many are around 2.4m to 2.7m wide. A double leaves barely any circulation space, while a small double leaves enough room for a wardrobe and a walkway.
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Loft conversions. Where the ceiling slopes, a narrower bed can be pushed further under the eaves without losing headroom on the usable side.
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Guest rooms. A single feels inadequate for a visiting couple. A double can dominate a room used a handful of times a year. A small double manages both jobs without redesigning the space around infrequent visitors.
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Teenagers’ rooms. Outgrowing a single is normal, but a desk still needs to fit. The 15cm saved is often exactly the width a narrow desk needs.
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Period properties. Victorian and Edwardian rear bedrooms were rarely built with modern bed sizes in mind, and chimney breasts eat into usable wall length.
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The point of choosing a smaller bed is to buy back floor space, so plan how you will use it. Reasonable working figures:
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In narrow rooms, pushing the bed lengthways against one wall almost always reads better than centring it. You get one clear route through the room instead of two cramped ones, and the remaining wall becomes usable for storage.
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This is the practical point people wish they had known first. Small double fitted sheets and mattress protectors are widely available in the UK because they are cut to size. Printed duvet cover ranges are more limited, since manufacturers concentrate on single, double and king.
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The standard workaround is straightforward: use a small double fitted sheet with a regular double duvet and cover. A double duvet at 200cm by 200cm gives generous overhang on a 120cm mattress, which looks deliberate rather than oversized, and it opens up the full choice of covers rather than a narrow subsection.
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If you prefer an exact fit, small double duvet sets do exist, typically around 200cm by 200cm anyway, so the difference in practice is minimal.
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Rooms that need a small double rarely have space to spare elsewhere, so the bed itself should pull its weight. Frames with drawers in the base, or ottoman lift designs, can replace a chest of drawers entirely in a box room. Our modern small double wooden beds UK sale range includes storage designs sized for 120cm mattresses.
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Beyond the bed, work upwards rather than outwards. Taller, shallower wardrobes use vertical space that the bed cannot claim, and sliding doors avoid the clearance problem entirely when the bed sits close by. Our modern wardrobes UK sale range covers both hinged and sliding options in a range of depths.
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For bedside storage, a single narrow cabinet with a drawer usually serves a small room better than a pair of open tables. Our modern bedside cabinets UK sale selection includes slim widths intended for tight gaps.
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At 120cm wide, proportion matters. A very tall or heavily padded headboard can look top heavy, particularly under a low or sloping ceiling. Lower headboards, simple upholstered panels and slatted timber designs sit more comfortably at this width.
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Legs are worth considering too. A frame raised on visible legs shows floor beneath it, which helps a small room read as larger and makes cleaning easier. A base that meets the carpet feels more substantial but takes more visual weight in a room that has little to spare.
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Three checks cover almost everything:
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The alcove. Measure the wall to wall space and compare it with the overall frame width, not the mattress width.
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The route in. Doorway widths, stair turns, landing space. Flat packed frames handle awkward access far better than rigid bases.
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The existing mattress. If you are keeping a mattress from an old three quarter bed, measure it. Older three quarter beds predate standardisation and can be narrower or shorter than 120cm by 190cm.
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If you are furnishing the room completely, working from a coordinated range saves cross referencing finishes. Our modern bedroom furniture UK sale pages cover beds, wardrobes, drawers and cabinets in matching styles.
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We stock small double beds in fabric, wood, metal and high gloss finishes, with mattress and frame measurements listed on every product page. You can shop modern furniture at Furniture in Fashion, with free delivery to most UK mainland postcodes.
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A 120cm mattress still needs even support. Sprung slats spaced no more than around 7cm apart work well, and many small double frames include a central rail with a leg to the floor. Without one, the mattress tends to dip through the middle after a year or two of use.
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The base type also decides what you can store. A slatted frame on legs leaves usable clearance beneath for suitcases and boxes, which in a box room is genuinely valuable. A solid platform base blocks that space unless the design includes drawers.
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Depth is the one dimension you choose. A shallow mattress of 18cm to 20cm keeps the bed low, which sits better under a sloping ceiling or a low window. A deeper mattress at 25cm or more is easier to get out of but adds visual weight in a small room.
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Check sheet depth allowance too. Small double fitted sheets are usually cut for mattresses up to around 25cm to 30cm. Deep fill options exist but the choice at this size is narrower than for double or king, so it is worth confirming availability before committing to a very thick mattress.
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Fifteen centimetres saved against a double is only worth having if you use it deliberately. In practice that width usually goes to one of three things: a wardrobe door that now opens fully, a chest of drawers that fits on the end wall, or a walkway that no longer requires turning sideways.
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Decide which of those matters most before choosing where the bed sits. A room planned around one clear benefit almost always works better than a room where the space has simply been spread thinly around the bed.
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120cm wide by 190cm long, which is 4ft by 6ft 3in, or 48 inches by 75 inches.
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Yes. Both names refer to the same 120cm by 190cm UK mattress size.
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Yes, though with 60cm each it is tighter than a standard double. It suits guest rooms and occasional sharing better than nightly use for two.
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A standard double duvet at 200cm by 200cm works well and gives a neat overhang. Use a small double fitted sheet underneath.
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Allow for the frame rather than the mattress, typically 127cm to 138cm depending on the design, plus a little tolerance at each side.
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