HMO room sizes and amenity standards

What are the minimum bedroom sizes for an HMO?

Since 1 October 2018, every HMO licence in England must include conditions setting minimum floor areas for rooms used for sleeping. These national minimums come from Schedule 4 to the Housing Act 2004 and the Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018.

The figures are a floor, not a target. Councils can set higher local standards through their HMO amenity standards and licence conditions, and some publish their own room size tables. Where your council's standard is higher, the council's figure is the one your design has to meet.

How does the 1.5 m ceiling rule work?

Any part of a room where the ceiling height is less than 1.5 m does not count towards the floor area. The rule matters most in loft rooms, rooms with sloping ceilings, dormers and spaces under stairs.

Take a loft bedroom with 9.0 m² of floor in total. If 3.0 m² of that floor sits under parts of the roof where the ceiling is lower than 1.5 m, only 6.0 m² counts. That is below the 6.51 m² minimum for one person aged over 10, so the room cannot be let as a single bedroom to an adult, even though it looks generous when you walk in.

To check a sloping room, mark the line on each side where the ceiling reaches 1.5 m, measure the floor between those lines, and add any full-height areas such as a dormer. Record the ceiling heights on the floor plan so the council can follow your figures.

What size rooms do children need in an HMO?

A room used for sleeping by one child aged under 10 must be at least 4.64 m². A room between 4.64 m² and 6.51 m² can therefore be used only by a child under 10, not by anyone older. The national conditions set figures only for the three cases in the table, so check your council's standards if you plan to house families.

Any room under 4.64 m² must not be used for sleeping by anyone, and the licence holder must tell the council about any such room. These rooms can still be useful as a study, a store or a utility room.

Since 1 May 2026, the Renters' Rights Act bans blanket refusals of tenants who have children. The licence's room size and occupancy limits still apply, so assess each household against the rooms you actually have.

Do councils set their own standards for kitchens and bathrooms?

Yes. Beyond bedroom sizes, each council sets its own HMO amenity standards, and they vary across the Midlands. They usually cover:

• how many bathrooms, showers and toilets are needed for a given number of occupiers;
• what a shared kitchen must contain for the number of people using it, such as sinks, cookers, worktop, storage, fridge and freezer space and sockets;
• whether a communal living room is expected, and whether bedrooms must be larger where there is no shared living space;
• how far a kitchen can be from the bedrooms it serves;
• heating, ventilation and lighting in each room.

Because these standards differ, a layout that is licensable in one district may need changes in the next. Read your council's standards before you fix the number of bedrooms, or ask us to check them as part of a survey. Our communal kitchens and bathrooms are designed to the relevant council's figures.

What happens if a room is too small?

In a licensed HMO, a room that falls below the size conditions breaches the licence. The council can allow up to 18 months to put it right, which can give time to deal with an existing tenancy. The length of any period is for the council to decide, so talk to them early.

Practical ways to fix an undersized room include:

• reducing the occupancy, for example using a two-person room for one person only;
• moving a partition wall to enlarge the room, if the neighbouring room can still meet its own minimum;
• combining two small rooms into one;
• changing the room to a use other than sleeping, such as a study, store or utility room;
• creating space in the loft or an extension, subject to planning and building regulations.

Breaching a licence condition is an offence, and the maximum civil penalty is £40,000. If a council inspection has flagged room sizes, an HMO compliance audit sets out the options and their costs.

How should I measure an HMO bedroom?

Careful measuring avoids unwelcome surprises at inspection. A few practical habits help:

• Measure at floor level, wall to wall, using a laser measure. Take every wall, not just two.
• Split awkward rooms into rectangles, work out each area, then add them together.
• Deduct floor under ceilings lower than 1.5 m.
• Record areas to two decimal places and do not round up. A room at 6.49 m² is below 6.51 m².
• Ask how your council treats chimney breasts, built-in wardrobes, boxed-in stairs and en-suite floor space. Practice varies.
• Allow for finishes. New plasterboard, insulated dry lining or fire-resisting linings can take space off a room that is close to the limit.
• Measure again after works and update the floor plan before you apply for or vary a licence.

Councils usually ask for a floor plan with each room's area. Our HMO floor plans show room uses, areas and ceiling heights in a format licensing teams can check quickly.

How do room sizes shape an HMO conversion design?

Room sizes set the number of lettable rooms, and the number of rooms drives most of the cost and income figures for a conversion. Design around them from the start:

• Aim for a margin above the minimum, so finishes and small measuring differences do not push a room under.
• Remember that a protected escape route, fire lobbies and en-suite shower rooms all take floor space from bedrooms.
• Check the council's kitchen and bathroom standards at the same time. Adding a bedroom can push the house over a threshold that calls for another bathroom or a bigger kitchen.
• Think carefully about a seventh occupier. Seven or more residents makes the house a large HMO in planning terms, which always needs planning permission.

We measure every room as part of a free survey and test layout options before any walls move. Our guide to converting a house to an HMO sets out the full sequence.

Do room size rules apply to HMOs that do not need a licence?

The national minimum sizes are licence conditions, so they apply directly to licensed HMOs. An HMO that does not need a licence is not bound by those conditions in the same way.

That does not leave smaller HMOs unregulated. The HMO management regulations apply to every HMO, and councils have wider housing powers, including overcrowding notices, which carry a civil penalty of up to £40,000 if breached. Using the national minimums as a benchmark for every shared house is sensible, and it keeps the property ready for licensing if the council introduces an additional scheme later.

Sources

• Housing Act 2004, Schedule 4: licence conditions
• Licensing of HMOs (Mandatory Conditions of Licences) (England) Regulations 2018, regulation 2
• GOV.UK: House in multiple occupation licence
• Housing Act 2004, section 249A: civil penalties

This guide explains the rules in England as we understood them in October 2026. It is general information, not legal or financial advice. Check with your council and take professional advice for your own situation.