HMO Bedroom Size Rules in England: Minimum Sizes and How to Measure

September 18, 2026
HMO

By House Manage Editorial Team
Reviewed against official guidance on 18 September 2026

For licensed houses in multiple occupation 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.

These figures are minimum licensing standards, not an automatic right to let the room. A local council can require larger rooms, restrict the number of occupants or decide that a room is unsuitable because of its shape, ceiling height, facilities or other property conditions.

The national minimum HMO bedroom sizes

The following minimum sizes apply as mandatory conditions of Part 2 HMO licences in England, including mandatory and additional HMO licences granted or renewed under the current rules.

Intended occupancy	National minimum floor area
One person aged over 10	6.51m²
Two people aged over 10	10.22m²
One child aged under 10	4.64m²
Room below 4.64m²	Must not be used as sleeping accommodation

The property’s HMO licence should state the maximum number of people permitted to occupy each sleeping room.

A room smaller than 4.64m² must not be used as a bedroom. The licence holder must also notify the local authority of any room in the HMO with a floor area below this figure.

These requirements come from the Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018 and the government’s accompanying HMO licensing reform guidance.

These figures apply to sleeping rooms, not every room

The national figures relate specifically to rooms used as sleeping accommodation in a licensed HMO.

They do not mean that every room above 6.51m² will be accepted as a bedroom. The council may also consider:

The shape and practical usability of the room
Areas with restricted ceiling height
The number and position of doors
Natural light and ventilation
Heating
Fire safety and escape arrangements
The property’s kitchen, bathroom and communal facilities
The council’s own HMO amenity standards
The maximum occupancy permitted by the licence

Communal space elsewhere in the property cannot compensate for a sleeping room that falls below the statutory national minimum.

How should an HMO bedroom be measured?

The official guidance states that the measurement is the wall-to-wall floor area where the ceiling height is greater than 1.5 metres.

Any part of the room where the ceiling is lower than 1.5 metres should be excluded. This is particularly important in loft rooms, attic conversions and bedrooms with sloping ceilings.

A practical measuring process

Measure the room internally from finished wall to finished wall.
Divide irregularly shaped rooms into rectangles or other simple sections.
Calculate the area of each usable section.
Exclude any area where the ceiling height is 1.5 metres or lower.
Add the remaining usable areas together.
Record the measurements and retain a dated floor plan.
Compare the result with both the national minimum and the council’s current local standards.

For a rectangular room measuring 2.5 metres by 3 metres:

2.5m × 3m = 7.5m²

On the national minimum alone, this could potentially accommodate one person aged over 10. However, the landlord must still check whether the council requires a larger room and what occupancy the HMO licence allows.

How do you measure a loft room with sloping ceilings?

Do not calculate the whole footprint of a loft room and assume that all of it counts.

For example, a loft room might have a total floor footprint of 11m², but 3m² could sit beneath ceiling areas no higher than 1.5 metres. Its relevant measured area would therefore be approximately 8m², subject to the council confirming the measurement.

Marking the 1.5-metre height line on the walls before measuring can make the usable area easier to identify.

Landlords planning a loft conversion should account for this at the design stage. A room that appears generous on a basic floor plan may provide much less qualifying floor area once the sloping sections are removed. Our guide to checking whether a property is suitable for an HMO conversion explains some of the other matters to examine before starting work.

Can a council require a larger bedroom?

Yes. The national measurements are statutory minimums, not recommended or optimal room sizes.

A local authority can require higher room-size standards through its licence conditions. Councils may also publish separate amenity standards covering matters such as:

Single and double occupancy
Rooms containing cooking facilities
Combined bedroom and living spaces
Kitchen provision
Bathroom and toilet ratios
Shared living or dining space
Storage, heating, ventilation and waste facilities

This means a 6.7m² bedroom may be above the national minimum for one person but still fail a local standard requiring a larger space.

Always check the standards published by the council responsible for the property. Do not rely solely on standards used by a neighbouring borough or a different property in the same portfolio.

The government’s local council finder can help identify the correct authority.

Is the minimum different for a couple?

At national level, a sleeping room occupied by two people aged over 10 must measure at least 10.22m².

However, meeting that measurement does not automatically mean the room can be occupied by a couple. The council may require a larger double room, and the licence must authorise the room for two-person occupancy.

The landlord must also ensure that the wider property has sufficient facilities for the total number of residents.

What about babies and children?

The national minimum for a room occupied by one child under 10 is 4.64m².

Government guidance indicates that local authorities would normally be expected to disregard an infant under one when calculating minimum room sizes and occupancy. Landlords should nevertheless notify the council when household circumstances change rather than making assumptions about permitted occupancy.

The licence and the council’s written decision should remain the primary reference points.

Room size, planning permission and building regulations are different

HMO projects can require several separate approvals. Passing one process does not guarantee compliance with the others.

Requirement	What it generally controls
HMO licensing	Property management, safety, amenities, room occupancy and licence conditions
Planning permission	Whether the property may lawfully be used as the proposed type or size of HMO
Building regulations	The design and construction of alterations, including structure, fire safety, ventilation and insulation
Housing standards	Hazards, overcrowding and the overall fitness and safety of the accommodation

A planning drawing showing a bedroom does not necessarily mean the licensing team will authorise it for occupation. Similarly, an HMO licence does not replace any required planning permission or building-control approval.

If you are unsure whether the property needs a licence, start with our guide explaining when an HMO licence is required, followed by written checks with the relevant licensing and planning departments.

What happens if an HMO bedroom is too small?

A room below the applicable standard may be restricted or prohibited from use as sleeping accommodation. The council may also reduce the maximum number of permitted occupants.

Depending on the circumstances, the practical options could include:

Stopping use of the room as a bedroom
Reclassifying it as storage, study or communal space
Moving an internal partition, where lawful and technically suitable
Combining it with another area
Reducing the room from double to single occupancy
Changing the layout of the property
Seeking specialist planning, building-control or licensing advice

Alterations should not begin until their structural, fire-safety, building-control and planning implications have been checked.

Breaching an HMO licence condition can lead to enforcement action. A landlord should act promptly if an inspection, new measurement or licence condition identifies a problem.

Common room-measurement mistakes

Counting low sections of a loft room

Floor space beneath a ceiling height of 1.5 metres or less should not be included in the national measurement.

Rounding measurements upwards

A room measuring 6.48m² does not become 6.51m² because the difference appears small. Use accurate measurements.

Relying on estate-agent floor plans

Marketing floor plans are not necessarily sufficiently precise for licensing purposes. Take proper internal measurements.

Assuming the national minimum overrides local policy

Councils can impose higher standards. The relevant licence conditions and current local guidance must be checked.

Treating a licence application as approval

Submitting an application does not mean that every proposed bedroom or occupancy level has been accepted.

Measuring only after construction

Room-size and ceiling-height calculations should be completed during the design stage of an HMO conversion. Discovering the shortfall after the work is finished can be expensive.

HMO room-size checklist

Before advertising or allocating an HMO bedroom:

Measure the room from finished wall to finished wall.
Exclude areas where the ceiling height is 1.5 metres or lower.
Check the national minimum applicable to the occupant.
Read the council’s current HMO and amenity standards.
Check the permitted occupancy stated on the licence.
Confirm whether licensing, planning and building-control records agree.
Keep a dated floor plan and measurement record.
Recheck the position after structural or layout alterations.
Obtain written clarification from the council where the measurement is borderline.

Final point for landlords

The safest approach is not to design an HMO bedroom to the narrowest possible margin. A room that only just meets the national minimum may still be rejected under local standards or become unusable if the finished walls, insulation or ceiling construction reduce its qualifying area.

Allowing a sensible margin at the design stage gives the property a better chance of remaining practical, lettable and compliant.

If you would prefer professional help with ongoing compliance and property operations, you can learn more about House Manage’s HMO management service.

Sources and further reading

This article provides general information for properties in England and should not be treated as legal or planning advice. Requirements can vary according to the property, licence and local authority.