Start here: decide the mattress size you want, then check you have at least 60–70cm of walking space on any side you will use, and finally measure the route the bed has to travel — doorways, stairs and turns. Get those three right and a new bed fits first time. Get the last one wrong and even the perfect bed ends up stranded on the landing. Here is the whole process, with UK bed sizes in centimetres.
Buying a bed online is mostly an act of imagination — you are picturing something large in a room you cannot photograph from above. This guide replaces the guesswork with a tape measure and five minutes. We will cover the UK sizes, the clearance you actually need, and the one measurement almost everyone forgets.
UK bed sizes in centimetres
These are the standard UK mattress and frame sizes. Frame outer dimensions sit a little larger than the mattress, which is why room clearance matters (more on that below).
| UK size | Mattress (W × L) | Best for |
|---|---|---|
| Single | 90 × 190 cm | Children, single sleepers, small rooms |
| Small Double | 120 × 190 cm | One adult with room to spread; box rooms |
| Double | 135 × 190 cm | Couples in average-sized rooms |
| King | 150 × 200 cm | Couples wanting more width and length |
| Super King | 180 × 200 cm | Maximum space; larger rooms |
A quick note on length: King and Super King are also 10cm longer than a Double, which matters if anyone in the bed is over six foot.
How much space do you need around a bed?
As a rule, leave 60–70cm of clear floor on each side you will walk down or get dressed in, and a little more at the foot if you can. You can push one long side against a wall in a tight room, but you will want access to at least one side and ideally the foot. For a storage bed, the clearance rules change — see below.
Measure the route, not just the room
This is the measurement people forget, and the one that causes the returns. Before anything else, walk the path the bed will take from the front door to the bedroom: the width of the front door and internal doors, the turn at the top of the stairs, any tight landing, the bedroom door itself. A bed that fits the room perfectly is no use if it cannot get into it.
Here is the reassuring part: because every Belsogno bed is made to order and arrives in modular sections — headboard, footboard, side rails and base — rather than as one pre-assembled piece, it is far easier to manoeuvre through a typical UK home than a welded frame. You are carrying parts, not a wardrobe.
Extra clearance for storage beds
Storage beds need their own space to work. An ottoman bed lifts upward, so it needs headroom above the mattress — keep it clear of sloped ceilings and low shelves. A divan drawer bed needs clear floor beside it so the drawers can pull out fully. If you are weighing the two, our guide to ottoman bed frames and the five questions to ask before buying an ottoman both cover the clearance check in detail.
A five-minute measuring method
What you need
- A tape measure (a soft one helps for the route)
- A pen and paper, or your phone’s notes
- Optional: masking tape to mark the footprint on the floor
The steps
- Measure the room’s length and width, and note windows, radiators, doors and the swing of the door.
- Mark your chosen mattress size on the floor with masking tape — seeing the real footprint is worth more than any drawing.
- Check the walking clearance on each side you will use (aim for 60–70cm).
- Measure the delivery route end to end, including the narrowest doorway and any stair turn.
- If it is a storage bed, add the headroom (ottoman) or side-clearance (divan) check.
Still unsure which size to choose?
If you are between two sizes, the honest advice is usually to take the larger only if you can keep 60cm of walking space around it; otherwise the smaller size will make the room feel calmer and work harder. And if it is the fabric you are undecided on rather than the size, we will send a free swatch pack to your door so you can see the colours in your own light.
Frequently asked questions
What is the most popular UK bed size?
The Double (135 × 190cm) remains the standard for couples in average-sized rooms, while the King (150 × 200cm) is the most common upgrade where space allows.
Will a King bed fit in a small room?
Sometimes — a King needs roughly 150cm of width plus walking space, so in a small room you may have to push one side to the wall and accept access from one side and the foot. Marking the footprint on the floor with tape is the fastest way to know for certain.
Do I measure for the mattress or the frame?
Both. Choose by mattress size, but leave clearance for the frame, which sits a little wider and longer than the mattress — especially upholstered frames with padded rails.
What if my doorway or stairs are narrow?
A made-to-order bed that arrives in sections is much easier to bring through a narrow space than a pre-built frame. Measure the narrowest point on the route; if you are still unsure, ask us before you order.
The honest bottom line
Five minutes with a tape measure prevents the most expensive bed mistake there is. Decide the size, protect 60–70cm of walking space, and measure the route to the room. When you are ready, browse the full range of luxury beds and bed frames in every UK size, or order a free swatch pack first.
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