What is the minimum bedroom size for an HMO in England?

6.51 square metres for one person aged over 10, 10.22 square metres for two persons aged over 10, and 4.64 square metres for one child under 10. Floor area under a ceiling lower than 1.5 metres is excluded.

Does a sloping ceiling count towards HMO room size?

No. Any floor area where the ceiling height is less than 1.5 metres is excluded from the usable floor area, so loft rooms often measure smaller than their footprint suggests.

Can a council require larger rooms than the national minimum?

Yes. The 2018 Regulations set mandatory national minimums. Local authorities can impose stricter conditions through their own licensing schemes, so always check the specific scheme.

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HMO room size requirements in England

The three legal minimums, where they come from, and the rule about sloping ceilings that catches people out.

Digital Property Inspector · Updated August 2026

If you licence a house in multiple occupation in England, the minimum sleeping room sizes are set in law, not by the council's preference. They come from the Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018, which took effect on 1 October 2018.

The three figures

Who sleeps there	Minimum usable floor area
One person aged over 10	6.51 m² (70.1 sq ft)
Two persons aged over 10	10.22 m² (110.0 sq ft)
One child aged under 10	4.64 m² (49.9 sq ft)

The part people miss

Floor area under a ceiling height of less than 1.5 m does not count. A loft room measuring 8 m² on the floor can fail on 6.51 m² once the sloping ceiling is taken out. Measure the usable area, not the footprint.

What that means when you are standing in the room

A room that is 2.4 m by 2.7 m gives 6.48 m². That is three centimetres short of the single adult minimum, and it fails. This is the sort of margin that decides whether a property works as an HMO, so measure before you offer, not after.

Two things follow from that:

Measure wall to wall at floor level, and separately measure any part of the room where the ceiling drops below 1.5 m so you can take it out.
Record the ceiling height as well as the floor area. Without it you cannot prove the usable area later, and a licensing officer will ask.

The national minimum is a floor, not a target

Local conditions can be stricter

These are the mandatory national conditions. A local authority can and often does impose larger minimums through its own licensing scheme, and many require additional communal space per occupier. Meeting 6.51 m² does not make a property compliant; it makes it not automatically non-compliant.

Always check the specific conditions of the licensing scheme in that borough before you commit.

Other things a licence usually turns on

Fire detection — grade and coverage, and whether alarms are interlinked
Escape routes — protected, unobstructed, correct door ratings
Amenities per occupier — bathrooms, WCs and kitchen facilities scale with the number of people, and the ratios are set locally
Gas and electrical certificates — current, and produced on request
Waste — adequate provision, which sounds trivial and is a common refusal

Recording it so it stands up later

A measurement is only worth anything if you can show where and when it was taken. For each sleeping room, record the length and width, the resulting area, the ceiling height, and a photograph of the room and of the tape in place. Date-stamped, against the room, in one record.

That is the difference between an opinion about a property and evidence about it.

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