Double Beds or Single Beds? How to Decide

Choose a double bed if two people will sleep in it, if you are an adult who likes room to turn over, or if the bedroom can take a 135 cm wide frame with at least 60 cm of clear floor on the sides you use. Choose a single bed if the room is narrow, if it is for a child or a guest who stays alone, or if floor space for a desk, wardrobe or play area matters more than sleeping width. The decision usually comes down to three things: who sleeps there, how the room is shaped, and how long you expect the bed to stay.

That is the short answer. The longer one depends on the details of your home, so below we work through the measurements, the households that suit each size and the questions worth asking before you browse our modern beds UK range.

Understanding UK Bed Sizes First

Bed sizes in the UK follow a fairly settled pattern, and knowing them makes the choice clearer. A standard single mattress measures 90 cm by 190 cm. A small double, sometimes called a three quarter bed, is 120 cm by 190 cm. A standard double is 135 cm by 190 cm. King size and super king size go wider again, at 150 cm by 200 cm and 180 cm by 200 cm.

The frame always adds to those figures. A slim metal frame might add only a few centimetres, while an upholstered frame with a deep headboard and padded sides can add 10 cm or more to both width and length. When you compare a single with a double, compare the frame dimensions rather than the mattress, because the frame is what meets your walls, radiators and doors.

The gap between a single and a double is 45 cm of width. On paper that sounds modest. In a box room of around two metres across, it is the difference between a bed with a walkway beside it and a bed pushed tight against both walls. That is why it helps to plan the bed together with the rest of your modern bedroom furniture UK, so the frame, bedside cabinets and storage share the space sensibly.

Who Will Actually Sleep in the Bed?

Start with people rather than furniture. A single bed gives one adult 90 cm of width, which is comfortable for most children and many lighter sleepers. Taller or broader adults, and anyone who sleeps on their front with arms spread, often find a single restrictive after a few nights.

A double gives two adults 67.5 cm each, which is less than a single per person. That surprises many couples. It works well for partners who sleep close together, but restless sleepers, people who run hot and households where one partner works shifts may find a double cramped. In those cases a king size is worth considering if the room allows it.

For a single adult living alone, a double is often the more comfortable long term choice, even if it is not strictly necessary. The extra width gives room to read, stretch out and share the bed with a visiting partner or a child after a bad dream.

Measuring the Room Properly

Measure the room at floor level and again at around knee height, because skirting boards, radiators and window sills all steal space in different places. Then mark out the frame size on the floor with masking tape and live with it for an evening. Walk around it, open the wardrobe, open the door and pull out any drawers.

As a working guide, aim for around 60 cm of clear floor on any side of the bed that someone needs to get in and out of, and around 70 cm in front of wardrobes and chests so doors and drawers open without hitting the bed. If a double only fits by pushing one long side against the wall, ask whether that suits the people sleeping in it. One partner climbing over the other every night soon becomes tiresome.

Rooms in older terraced homes often have a chimney breast that breaks up one wall. A single can sit neatly in an alcove beside it, while a double may need to sit centrally on the opposite wall. Newer homes often have smaller third bedrooms where a single is the only size that leaves room for anything else.

When a Single Bed Makes More Sense

A single bed earns its place in several common situations. Children’s rooms are the obvious one, since a single leaves floor space for play, homework and storage. Box rooms and narrow second bedrooms are another. A single also suits a home office that occasionally hosts a guest, where the room needs to work as a workspace most of the year.

Singles are easier to move up narrow staircases, easier to reposition when you rearrange a room and easier to make each morning. For a teenager, a well made single with good storage underneath often serves better than a double that leaves no space for a desk. Our single wooden beds UK collection includes simple frames that sit comfortably in compact rooms and can move with a child as they grow.

When a Double Bed Is the Better Investment

A double usually makes sense for any main bedroom, for most adult guest rooms and for older teenagers who are heading towards adulthood. It is the size most adult bedding is sold in, it gives couples a shared space, and it gives a single sleeper noticeably more comfort.

If you are furnishing a spare room that will host couples several times a year, a double is the more welcoming option. It is also the more flexible choice when you are unsure how the room will be used in a few years. A spare room can become a nursery, a teenager’s room or a lodger’s room, and a double adapts to most of those changes.

Upholstered frames are a comfortable way to soften a double in a main bedroom. Our modern double fabric beds UK sale range covers padded headboards in a variety of textures, which helps a bed sit warmly in a room without needing extra decoration. If you are weighing up going wider still, our guide to UK king size bed dimensions for frames, mattresses and rooms explains how much more floor space the next size up needs.

The Small Double: A Useful Middle Ground

The small double, at 120 cm wide, sits between the two and solves several problems. It gives a single adult generous space without the footprint of a full double, and it can host an occasional couple for a weekend. In a narrow room it may leave just enough floor on one side for a bedside table and a clear path to the door.

The trade off is bedding. Small double sheets and duvets are available, but the choice is narrower than for singles and doubles. Many people simply use double bedding and tuck it in further, which works well for duvets but less neatly for fitted sheets.

Thinking About Storage

Storage often tips the decision. A single bed with drawers or a lifting base can hold a surprising amount: bedding, out of season clothes, toys or school projects. A double offers more volume underneath, but it also takes more of the floor where a chest of drawers might otherwise stand.

Look at the whole room when you plan. If choosing a double means losing a wardrobe, you may end up with more clutter rather than less. If choosing a single frees space for a tall chest and a small desk, the room may feel calmer and work harder.

Planning for the Years Ahead

A bed is usually a long term purchase, so think about how the room will change. A single in a seven year old’s room may suit them until their mid teens, at which point many families move to a small double or double. Buying a double early can avoid a second purchase, but it can also crowd a young child’s room during the years they most need floor space to play.

For guest rooms, consider how often you host and who visits. If guests are usually grandparents, a double at a comfortable height with firm support may matter more than width. If guests are mostly children’s friends on sleepovers, a single with a trundle underneath may be far more useful. For younger sleepers, our article on upholstered single beds for UK children and teenagers looks at frames that soften a child’s room and adapt as tastes change.

Height, Headboards and Getting In and Out

Width is not the only measurement that matters. A bed’s height affects how easily people sit down and stand up, and that is particularly relevant for older guests or anyone with stiff knees. A combined frame and mattress height of around 50 cm to 60 cm suits most adults, letting feet rest flat on the floor while sitting on the edge.

Headboards change how big a bed feels. A tall, upholstered headboard on a double can dominate a small room, while a low or slatted headboard keeps the eye moving across the space. In a single bed, a headboard can make a child’s room feel more grown up, and a padded one is softer to lean against while reading.

A Simple Way to Decide

If you are still unsure, run through four short questions. Will two people sleep in this bed regularly? If yes, choose a double or larger. Is the room less than about 2.5 metres in its shortest direction? If yes, a single or small double will probably leave a more usable room. Does the room need to hold a desk, play space or large wardrobe as well? If yes, lean towards a single. Will the bed need to serve for many years as the household changes? If yes, a double offers more flexibility.

Most homes end up with a mix: a double or king in the main bedroom, a double in a spare room if space allows, and singles in children’s rooms and box rooms.

Whichever size you settle on, take your time with the tape measure, think about who will sleep there in a few years, and choose a frame that suits the room as well as the mattress. You can explore our full selection of beds and bedroom pieces at Furniture in Fashion, with free delivery to most UK mainland postcodes.

Frequently Asked Questions

Is a double bed big enough for two adults?

A double gives each adult 67.5 cm of width, which suits couples who sleep close together. Couples who like more personal space, or who disturb each other at night, are often more comfortable in a king size.

What size room do I need for a double bed?

Allow the frame size plus around 60 cm on each side people use to get in and out, and space at the foot for walking. Many standard UK double bedrooms manage this comfortably, but small second bedrooms may not.

Is a small double a good choice for a single adult?

Yes. At 120 cm wide it gives one adult generous room while taking up less floor than a standard double, which is helpful in narrow rooms.

Should a teenager have a single or a double bed?

It depends on the room. If a double leaves no space for a desk and storage, a single or small double is usually more practical. Older teenagers in larger rooms often appreciate the extra width of a double.

Can I use double bedding on a small double bed?

Double duvets work well on a small double. Fitted sheets are best bought in the correct small double size so they sit neatly on the mattress.