How big should my home be? The UK space standard, worked out for your household
England's nationally described space standard asks a new home for at least 39 m² for one person, 50 m² for a one-bedroom flat for two, 70 m² for a two-bedroom flat for four and 93 m² for a three-bedroom house for five. A single bedroom is at least 7.5 m², a double 11.5 m². The average home in England is 94 m². The standard is a planning rule for new homes, not a law for the home you live in now.
Type how many people live in your home, its bedrooms and floors. The calculator gives the smallest floor area England's space standard allows for a new home like it, and compares your home if you know its size: the total floor area is on its EPC. Add your bedrooms' sizes to check each one. It is a yardstick, not a test: most homes in Britain were built before the standard existed.
What the space standard is, and what it is not
The nationally described space standard is a two-page table the government published in March 2015, with notes added in May 2016. It sets the smallest gross internal area (all the floor inside the outer walls) for a new home, by its bedrooms, bed spaces and floors, plus the smallest bedrooms and the built-in storage.
- It covers England only. Scotland, Wales and Northern Ireland have their own rules; this page does not cover them.
- It covers new homes only. Its own words: its sizes are "relevant only in determining compliance with this standard in new dwellings and have no other statutory meaning or use".
- It applies only where a council chooses. A council can require it through its Local Plan. Many do, not all.
- Permitted development is the exception. Since 6 April 2021, every new home made under permitted development rights, for example an office turned into flats, must meet it and be at least 37 m².
- It is not a building regulation. GOV.UK says it "remains solely within the planning system".
So for the home you live in now, the standard is a yardstick, not a law. If your flat is smaller, nobody has broken a rule. For existing homes in England, the legal tests are different and lower: the overcrowding rules in Part X of the Housing Act 1985, and the minimum bedroom sizes for licensed shared houses (HMOs).
The formula, written out
- Bed spaces: one per person. A single bedroom gives one bed space, a double or twin two. So a home of p bed spaces in b bedrooms has p − b doubles, and a home for two or more needs at least one double.
- The type: bedrooms and bed spaces, written like 3b5p (three bedrooms, five people: two doubles and a single).
- The minimum: look up the type in the table below, in the column for the number of floors. Stairs take room, so a house needs more than a flat with the same rooms.
- Your home: your floor area − the minimum. Space per person: your floor area ÷ the number of people.
Example: four people in a three-bedroom, two-storey house is type 3b4p, so the minimum is 84 m², with 2.5 m² of built-in storage. If the house is 80 m², it is 4 m² under the figure, and 20 m² a person.
The minimum floor area for every home type
Gross internal area in m², from Table 1 of the standard. A dash means the standard gives no figure for that combination.
| Home | Type | 1 floor | 2 floors | 3 floors | Storage |
|---|---|---|---|---|---|
| 1 bedroom, 1 person | 1b1p | 39 (37) | – | – | 1.0 |
| 1 bedroom, 2 people | 1b2p | 50 | 58 | – | 1.5 |
| 2 bedrooms, 3 people | 2b3p | 61 | 70 | – | 2.0 |
| 2 bedrooms, 4 people | 2b4p | 70 | 79 | – | 2.0 |
| 3 bedrooms, 4 people | 3b4p | 74 | 84 | 90 | 2.5 |
| 3 bedrooms, 5 people | 3b5p | 86 | 93 | 99 | 2.5 |
| 3 bedrooms, 6 people | 3b6p | 95 | 102 | 108 | 2.5 |
| 4 bedrooms, 5 people | 4b5p | 90 | 97 | 103 | 3.0 |
| 4 bedrooms, 6 people | 4b6p | 99 | 106 | 112 | 3.0 |
| 4 bedrooms, 7 people | 4b7p | 108 | 115 | 121 | 3.0 |
| 4 bedrooms, 8 people | 4b8p | 117 | 124 | 130 | 3.0 |
| 5 bedrooms, 6 people | 5b6p | 103 | 110 | 116 | 3.5 |
| 5 bedrooms, 7 people | 5b7p | 112 | 119 | 125 | 3.5 |
| 5 bedrooms, 8 people | 5b8p | 121 | 128 | 134 | 3.5 |
| 6 bedrooms, 7 people | 6b7p | 116 | 123 | 129 | 4.0 |
| 6 bedrooms, 8 people | 6b8p | 125 | 132 | 138 | 4.0 |
The bracketed 37 m² applies to a one-person home with a shower room instead of a bathroom. The storage is included in the floor area, and allows 0.5 m² for a boiler or hot water cylinder. Floor with less than 1.5 m of headroom does not count, unless it is storage. The standard also asks for a ceiling of at least 2.3 m over at least three quarters of the floor.
Minimum room sizes in the UK
Three different rules give bedroom sizes, for three different kinds of home:
| Rule | Applies to | Bedroom sizes |
|---|---|---|
| Space standard, 2015 | New homes in England, where it applies | Single: 7.5 m², 2.15 m wide. Double: 11.5 m²; the main double 2.75 m wide, any other 2.55 m. |
| HMO licensing, 2018 | Licensed shared houses in England | One adult: 6.51 m². Two adults: 10.22 m². A child under 10: 4.64 m². No smaller room may be used as a bedroom. |
| Housing Act 1985, Part X | Existing homes in England (the overcrowding test) | A room of 110 sq ft (10.2 m²) or more counts for 2 people, 90–110 sq ft for 1½, 70–90 sq ft for 1, 50–70 sq ft for ½. Smaller rooms do not count. |
A 3 × 3 m room (9 m²) is a single bedroom by the standard, even though a double bed fits. A 3 × 4 m room (12 m²) is a double. Work out your rooms' areas with the room size calculator.
Average house sizes in the UK
The English Housing Survey measures homes in England. Its figures are usable floor area, which is close to, but not the same as, the standard's gross internal area.
| Home | Average floor area | sq ft |
|---|---|---|
| Purpose-built flat | 58 m² | 624 |
| Converted flat | 65 m² | 700 |
| Bungalow | 77 m² | 829 |
| Terraced house | 88 m² | 947 |
| Semi-detached house | 97 m² | 1,044 |
| Detached house | 149 m² | 1,604 |
| All homes in England | 94 m² | 1,012 |
| Homes in London | 84 m² | 904 |
| Owner-occupied / private rented / social rented | 108 / 75 / 66 m² | 1,163 / 807 / 710 |
Source: English Housing Survey 2018-19. New homes are smaller in living space: LABC Warranty's 2018 study of 10,000 listings found 67.8 m² of living space in homes built since 2010, not counting halls and stairs, and an average living room of 17.1 m².
How to measure your home's floor area
- Look at your EPC first. Every Energy Performance Certificate gives a total floor area. Estate agents' floor plans usually give one too.
- Measure inside the outer walls, on every floor. The standard counts the floor between the inside faces of the outer and party walls, including inner walls, stairs, cupboards and the space above the stairs.
- Leave out low ceilings: floor under 1.5 m of headroom does not count, unless it is storage (then it counts at half, between 0.9 m and 1.5 m).
- Room by room is close enough: add up each room's area, then add about a tenth for walls, halls and stairs. That is our rule of thumb, not the standard's.
Common mistakes
- Counting bedrooms, not bed spaces. A three-bedroom home for four (3b4p) needs 84 m² over two floors; for six (3b6p), 102 m².
- Treating the standard as the law for your home. It sets the bar for new homes in councils that use it. A smaller older home is legal.
- Comparing external and internal sizes. Some listings give the gross external area, measured round the outside of the walls. It can be noticeably larger than the internal figure.
- Counting the loft or the space under the eaves in full. Floor under 1.5 m of headroom does not count as living space.
- Reading the size alone. Two flats of 60 m² can feel very different: one with a long hall loses space to it, one open-plan room does not.
See your real sizes
Snuug, the iPhone room app, rebuilds your room in 3D from one slow walk round it. Snuug measures every wall for you when it rebuilds your room, so you know your real sizes, not the agent's. Your room comes to within about 3% of its real size in our tests of ten homes, and our team checks every room by hand. Then move every piece in 5 cm steps, and find the layout that makes the most of every square metre you have.
Questions
How big should a 3-bedroom house be in the UK?
For a new two-storey house in England, the space standard asks for 84 m² for four people, 93 m² for five and 102 m² for six. On one floor the figures are 74, 86 and 95 m². The average terraced house in England is 88 m² and the average semi 97 m² (English Housing Survey 2018-19).
What is the minimum size for a one-bedroom flat in the UK?
In England, a new one-bedroom flat for two needs at least 50 m² under the nationally described space standard, and a one-person flat 39 m² (37 m² with a shower room instead of a bathroom). Homes made under permitted development, such as offices turned into flats, must meet the standard and be at least 37 m². Older flats can be smaller.
What is the minimum bedroom size in the UK?
It depends on the rule. For new homes in England, the space standard counts a single bedroom from 7.5 m² (2.15 m wide) and a double from 11.5 m². In licensed shared houses (HMOs), a bedroom for one adult must be at least 6.51 m², for two adults 10.22 m², and for a child under 10 at least 4.64 m². For other existing homes there is no minimum bedroom size, only the Housing Act 1985's overcrowding test.
Is the space standard a legal requirement?
Only for some new homes. It applies where a council has adopted it in its Local Plan, and to homes made under permitted development since 6 April 2021. It is not part of the Building Regulations, and it says its sizes have no other statutory meaning. Your landlord or seller does not break the law if an older home is smaller.
What is the average house size in the UK?
In England the average home has 94 m² of usable floor area (English Housing Survey 2018-19), and later surveys put it at about 95–96 m². Homes built since 2010 have about 68 m² of living space on average, by LABC Warranty's 2018 study of 10,000 listings, which leaves out halls and stairs.
How much space do I need per person?
There is no official per-person figure. The space standard works out at 39 m² for one person, 25 m² each for a couple in a one-bedroom flat, and about 19 m² each for five in a three-bedroom house. The average home in England has about 40 m² a person: 94 m² shared by the UK's average household of 2.35 people (our rough sum).
Editorial notes
Written by the Snuug team and checked on 1 November 2026. A number with no source beside it is a designers' rule of thumb, not a study.
- DCLG, Technical housing standards: nationally described space standard (March 2015, notes added 19 May 2016), Table 1 and paragraphs 1–10, read in full 31 Oct 2026
- GOV.UK, Technical housing standards: nationally described space standard, publication page ('Applies to England'; 'not a building regulation and remains solely within the planning system'), read 31 Oct 2026
- The Town and Country Planning (General Permitted Development) (England) (Amendment) Regulations 2020 (SI 2020/1243), regulation 3 (space standard and 37 m² for permitted development homes), read 31 Oct 2026
- Planning Portal, Content updates: new minimum space standards, April 2021 (from 6 April 2021), search summary 31 Oct 2026
- Housing Act 1985, section 326: the space standard for overcrowding, read 31 Oct 2026
- The Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018, regulation 2 (6.51, 10.22 and 4.64 m²), read 31 Oct 2026
- MHCLG, English Housing Survey 2018-19, Size of English homes fact sheet (usable floor area by type, tenure and region), read in full 31 Oct 2026
- Which? (Garber, 14 Apr 2018), Shrinking homes: LABC Warranty's study of 10,000 listings (67.8 m² of living space in homes built since 2010), read 31 Oct 2026
- ONS, Families and households in the UK: 2024 (2.35 people per household), search summary 31 Oct 2026
- Silentnight, Mattress and bed size guide (UK single 90 × 190 cm, double 135 × 190 cm), checked 31 Oct 2026
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