Short answer. The UK has no single minimum room size. In England, a new home built to the nationally described space standard needs a single bedroom of at least 7.5 m² (81 sq ft) and 2.15 m wide, and a double of at least 11.5 m² (124 sq ft); the main double must be at least 2.75 m wide. Councils decide whether to apply the standard, but every home created under permitted development since 6 April 2021 must meet it. In a licensed shared house (HMO) in England, a bedroom must be at least 6.51 m² for one person over ten and 10.22 m² for two. Real rooms are usually bigger: the English Housing Survey found bedrooms averaging about 12 m² in semi-detached houses and 14 m² in detached ones.
Will a double bed fit your bedroom?
The narrowest main double bedroom the space standard allows, 2.75 m, leaves 70 cm on each side of a 135 cm UK double. Try your own room below.
| Bed | Size in cm | Size in feet and inches | Good to know |
|---|---|---|---|
| Small single | 75 × 190 | 2 ft 6 × 6 ft 3 | Children's rooms and box rooms |
| Single | 90 × 190 | 3 ft × 6 ft 3 | The standard single |
| Small double | 120 × 190 | 4 ft × 6 ft 3 | Also sold as a "queen" by some brands |
| Double | 135 × 190 | 4 ft 6 × 6 ft 3 | Often called the most popular size for UK couples |
| King | 150 × 200 | 5 ft × 6 ft 6 | 10 cm longer than a double |
| Super king | 180 × 200 | 6 ft × 6 ft 6 | The width of two singles |
| Emperor | 200 × 200 | 6 ft 6 × 6 ft 6 | Sold by a few specialist makers |
Room sizes in the UK
| Room | Typical size | Legal minimum and the rule | Good to know |
|---|---|---|---|
| Double bedroom | About 12 m² (129 sq ft) in a semi-detached house, 14 m² (151 sq ft) in a detached one | 11.5 m² (124 sq ft); the main double 2.75 m (9 ft) wide, any other 2.55 m (8 ft 4): nationally described space standard, England, new homes. 10.22 m² (110 sq ft) for two adults: HMO licence conditions, England | The smallest main double the standard allows is about 2.75 × 4.2 m (9 ft × 13 ft 9). A built-in wardrobe counts towards the area. |
| Single bedroom | No official average | 7.5 m² (81 sq ft) and 2.15 m (7 ft 1) wide: space standard. 6.51 m² (70 sq ft) for one adult: HMO licence conditions | About 2.15 × 3.5 m (7 ft 1 × 11 ft 6) at the minimum, room for a 90 cm single against a wall with 1.25 m beside it. |
| Box room | No official definition | No room under 4.64 m² (50 sq ft) may be slept in: HMO licence conditions | In a new home built to the space standard, a room under 7.5 m² does not count as a bedroom. |
| Living room | About 17 m² (183 sq ft) in a semi-detached house, 21 m² (226 sq ft) in a detached one | No national minimum in England. Scotland: one main room of at least 12 m² (129 sq ft), 3 m (9 ft 10) each way, in new homes | The English figures are the survey's averages for houses, not flats. |
| Kitchen | No official average | No minimum area in the space standard. Scotland: a clear 1.5 × 1.5 m (4 ft 11 × 4 ft 11) turning space in new homes | Width decides what fits: measure from the face of the units to the wall opposite. |
| Bathroom | No official average | No minimum area | A one-bed, one-person home may be 37 m² instead of 39 m² if it has a shower room instead of a bathroom. |
| Hallway | No official average | 900 mm (2 ft 11) for a door approached head-on; 1050 or 1200 mm where you turn into a 775 or 750 mm door: Approved Document M, M4(1), new homes in England | Accessible homes built to M4(2) need every hall and landing 900 mm wide. |
| Ceiling height | No official average | 2.3 m (7 ft 7) over at least 75% of the floor: space standard | Floor where the ceiling is lower than 1.5 m (4 ft 11) does not count towards a home's area under the standard, or towards a bedroom's area under the HMO rules. |
| Whole home | 94 m² (1,012 sq ft) on average in England; 84 m² (904 sq ft) in London | Space standard, one storey: one bed for two people 50 m² (538 sq ft), two beds for four 70 m² (753 sq ft), three beds for five 86 m² (926 sq ft); one bed for one person 39 m² (420 sq ft), or 37 m² (398 sq ft) with a shower room | Flats average 67 m² owner occupied, 59 m² private rented and 55 m² social rented. |
Typical sizes are from the English Housing Survey: room averages from its 2012 data, published in 2018, and whole-home averages from 2018 to 2019. Your own tape measure beats any average.
What the rules cover, and where
- England, new homes: the space standard. Since 2015 the nationally described space standard sets bedroom, storage and whole-home sizes. It is optional: a council applies it only through its Local Plan, with evidence that it is needed. Since 6 April 2021 every new home made under permitted development rights must meet it and be at least 37 m².
- England, shared houses: HMO licences. HMO licences granted in England since 1 October 2018 require bedrooms of at least 6.51 m² for one person over ten, 10.22 m² for two people over ten and 4.64 m² for a child under ten. A room under 4.64 m² cannot be used for sleeping at all.
- England and Wales: overcrowding. The Housing Act 1985 counts how many people each room can sleep: 2 people in a room of 110 sq ft (10.2 m²) or more, 1.5 people from 90 sq ft (8.4 m²), 1 person from 70 sq ft (6.5 m²) and half a person from 50 sq ft (4.6 m²). Smaller rooms do not count. The HMO sizes of 6.51, 10.22 and 4.64 m² are the same 70, 110 and 50 sq ft steps, converted to square metres.
- Scotland. Building standard 3.11 sets no minimum for an ordinary room: each must take a bed, a wardrobe and a chest of drawers with room to use them. At least one room on the main living level of a new home must be at least 12 m² and at least 3 m long and 3 m wide (2.8 m in a home of up to three "apartments", the Scottish term for any room not used only as a kitchen, store or utility room). The Housing (Scotland) Act 1987 has the same overcrowding table as England and Wales.
- Wales. The space standard and the 2018 HMO room sizes apply in England only. The 1985 overcrowding table applies in Wales too.
- Older homes. The space standard and Scotland's building standards are for new homes and new building work, not homes already built.
How floor area is measured in the UK
- Gross internal area (GIA). The space standard measures between the inside faces of the outside walls. Internal walls, cupboards, ducts and stairs are included, so the rooms you can furnish add up to less than the total.
- Low ceilings. Floor under a ceiling lower than 1.5 m is not counted in the space standard (unless it is used only for storage) or in an HMO bedroom. Scotland's 12 m² room leaves out anything under 1.8 m.
- Usable floor area. The English Housing Survey's figure includes every room, internal walls, halls and stairs, but not an integral garage or a balcony.
- Square feet. UK rules mix units: the 1985 Act is in square feet, the newer rules in square metres. Divide square feet by 10.76 to get square metres.
Common mistakes
- Taking the minimum for the typical size. 11.5 m² is the minimum for a double bedroom in a new home, not what most homes have.
- Thinking the space standard covers every home. It applies only to new homes, and then only where the council has adopted it or the home is made under permitted development.
- Mixing up the HMO rules and the space standard. 6.51 m² is the minimum for an adult's bedroom in a licensed shared house, not for a single bedroom in a new home (7.5 m²).
- Judging a bedroom by its area. A 2.15 m wide single bedroom and a 2.75 m wide double hold very different beds. Width decides.
See your rooms in 3D
In Flatwalk you draw or photograph your flat's plan and walk through it in 3D. Furniture from real shops stands at its true size, so you can see whether a king leaves room for the wardrobe door, and the tape measure reads any gap in metres or in feet and inches.
What it does not do: Flatwalk does not check your plan against the space standard or the HMO rules, or tell you what the rules require, and your plan is only as true as the numbers you gave it. Measure the real room with a tape measure.
Also for the UK: bed sizes and door widths.
What Flatwalk does that older planners skip
Lights
Add ceiling lights, lamps and LED strips and see each room in the evening, not only by day.
Your flat in its city
Give the address and the street and buildings around you appear in 3D where the map has them.
Sun for your address
See where the sun falls by date and hour, before a new piece sits in it all summer.
One piece, in your own room
Through the live camera or in a photo of the room, stand it on your own floor at its true size before you buy.
Detail
Doors, radiators, kitchens, wardrobes and bathrooms built piece by piece, so new furniture meets what is really there.
Made for a thumb
Tap a piece and its choices appear: move it, turn it, replace it with another.
Swipe for more. Every picture is the app itself.
One flat, free
Most people plan one home. For that, Flatwalk costs nothing: no trial clock and no card. Drawing your flat, furniture at its true size, the tape measure, lights, sun and walking are all part of it, and each AI tool gives one free try. A membership is for people who want more flats or more AI.
Questions people ask
What is the minimum bedroom size in the UK? For a new home in England built to the nationally described space standard: 7.5 m² and 2.15 m wide for a single, 11.5 m² for a double, with the main double 2.75 m wide. In a licensed shared house in England: 6.51 m² for one person over ten and 10.22 m² for two. Scotland sets no bedroom minimum but asks for one room of at least 12 m² in a new home.
What is the average bedroom size in the UK? The English Housing Survey measured bedrooms averaging about 12 m² (129 sq ft) in semi-detached houses and 14 m² (151 sq ft) in detached houses. There is no official average for flats.
What size is a double bedroom in the UK? Under the space standard, at least 11.5 m² (124 sq ft). The main double must be at least 2.75 m wide, which leaves 70 cm on each side of a 135 cm double bed.
What is the minimum size of a box room in the UK? There is no official definition of a box room. In a new home under the space standard, a room under 7.5 m² does not count as a bedroom, and in a licensed shared house no one may sleep in a room under 4.64 m².
What is the average living room size in the UK? The English Housing Survey found living rooms averaging about 17 m² (183 sq ft) in semi-detached houses and 21 m² (226 sq ft) in detached ones. England sets no minimum living room size.
Flatwalk lets you place real furniture at its true size in a 3D plan of your own flat, free for one flat. It is coming soon to Google Play; join the waiting list at flatwalk.app.
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