HMO Room Sizes: Minimum Standards

HMO minimum room sizes

For licensed HMOs in England the national minimum sleeping-room sizes are 6.51m² for one person aged over 10, 10.22m² for two people aged over 10, and 4.64m² for one child under 10. A room under 4.64m² must not be used for sleeping. These figures are mandatory licence conditions from 1 October 2018 (SI 2018/616). They are a floor, not a target. Councils can — and often do — ask for more space or more communal area. Use this table as a room-sizes-for-HMO calculator starting point, then read the local amenity standard. See what counts as an HMO and the wider HMO rules and regulations. Measure before you bid; do not take the estate agent's floor plan as the licensed area.

Communal space cannot be added to a small bedroom to “make up” the statutory sleeping area. Two small rooms cannot be combined on paper unless they are actually one room. Visitors are excluded from the occupancy count. Specialist HMO mortgages follow the licensed occupancy, not the brochure bedroom count. If a room is only just over 6.51m², leave furniture off the plan until the officer has measured — a fixed wardrobe can be treated as part of the room, a free-standing one usually is not a reason to fail, but a bed that blocks the door will fail the fire inspection even if the area is legal.

How to measure floor area

Measure wall to wall inside the room that is normally used as a bedroom. Include built-in wardrobes that form part of the room. Exclude the area of an ensuite only if the council treats it as a separate compartment — many still include a small ensuite in the sleeping room; some do not. Draw the room on graph paper or a floor-plan tool and give each dimension in metres to two decimal places. Licensing officers re-measure. A 6.40m² room that was marketed as 6.51m² will be struck off the licence. Photograph the tape against each wall so you can show a valuer the same numbers later.

What counts towards floor area

Any part of the floor where the ceiling is lower than 1.5 metres does not count. That matters in loft conversions and box rooms with sloping eaves. Do not count a landing, a hallway or a shared kitchen towards a bedroom. The statutory test is the sleeping room itself. Local amenity guidance may still require a minimum living-room or dining space for the whole house on top of the bedroom minima. If a room has a dormer on one side and eaves on the other, only the part above 1.5m goes into the 6.51m² sum.

Kitchen and bathroom amenity standards per tenant

There is no single national square-metre figure for every HMO kitchen. Councils publish amenity standards that set how many occupiers can share a cooker, a sink, a fridge and worktop, and how many can share a WC, a bath or a shower. A typical pattern is one full bathroom and one separate WC for five occupiers, with extra facilities as numbers rise, but the local PDF is the rule. A house that meets bedroom minima can still fail if six people share one small galley. “HMO kitchen” searches are really amenity-ratio searches: read the council's HMO standards, not only the 6.51m² bedroom rule. Fire safety in kitchens (doors, detection, escape) sits alongside the space test.

When you read an amenity standard, note whether the kitchen must be a dedicated room, whether a cooker on a landing counts, and whether a second fridge in a bedroom is allowed. Some councils want a minimum worktop length per person; others only count hobs and sinks. Shared dining space is sometimes required once bedrooms sit at the statutory minimum so occupiers are not expected to eat on the bed. None of those extra rules replace 6.51m². They sit on top of it. If you are converting, draw the kitchen and bathrooms to the local PDF before you order fire doors.

Council variations

The statutory sizes are the lowest England allows on a Part 2 licence. Many university-city councils set larger preferred bedroom sizes or require extra communal living space once bedrooms are at the legal minimum. Those local figures are policy, not a second national law, but they become licence conditions when the council writes them onto the grant. Scotland and Wales use their own standards. If you own across two boroughs, do not copy one layout into the other. Ask for the current amenity standard PDF before you convert, and keep a dated copy in the mortgage pack so a valuer in another town is not guessing.

What happens if a room is too small

The council will not licence that room for sleeping. The licence occupancy drops. Letting it as a bedroom is a licence-condition breach. A valuer will usually drop that room from the rent a lender will stress-test, which can break the ICR even if the rest of the house is fine. You can use an undersized room as storage, an office or a closet if the council agrees — you must notify them of rooms under 4.64m². Do not market it as a bedroom. If you are mid-purchase, renegotiate on the licensed occupancy, not on the listing's bedroom count.

Room sizes and rental value

Larger rooms let faster and support a higher room rent, but only the licensed rooms count for finance. A six-bed brochure that licences as four rooms is a four-stream investment. Measure before you bid. The mortgage is modelled on the rooms that survive inspection, not on the listing. If you are comparing two houses, compare licensed occupancy and the rents a local agent will quote for those room sizes, not bedroom count on the particulars.

FAQs

What are the space standards for HMOs?

In England the statutory sleeping-room minima are 6.51m², 10.22m² and 4.64m² as in the table. Kitchens and bathrooms follow the council amenity standard.

Can 4 people live in a 3 bed HMO?

Only if one room meets the two-person size (10.22m² or the local higher figure) and the amenity ratios allow four occupiers.

What is a 6 bedroom HMO?

A house marketed with six lettable bedrooms. Licensing and lending count only the rooms that meet size and amenity rules.

What is a 5 bedroom HMO?

The same logic at five rooms. Five occupiers is also the usual mandatory-licensing trigger in England.

What size does a HMO room have to be?

At least 6.51m² for one adult (over 10) on a licensed HMO in England, unless the council sets a higher local minimum.

How much does a 4 bedroom HMO make?

Rent is local. Finance uses the licensed rooms and the rents a valuer accepts, not a national average. We do not quote an unsourced yield here.

What is the minimum room size for an HMO?

6.51m² for one person over 10; 10.22m² for two; 4.64m² for one child under 10.

Can a room under 6.51m² be used?

Not as a single adult bedroom on a licensed HMO. Under 4.64m² it cannot be used for sleeping at all.

What are HMO kitchen requirements?

Councils set cooker, sink, fridge and worktop ratios per occupier. There is no one national kitchen m² figure.

Do councils set larger room sizes?

Yes. The statutory figures are the floor. Many councils publish higher preferred sizes or extra communal-space rules.

Does ceiling height count for HMO room size?

Area under a ceiling lower than 1.5m is ignored when you measure the statutory floor area.