The national HMO minimum room size standards in England require a bedroom occupied by one person over the age of 10 to measure at least 6.51m², whilst a room for two people over the age of 10 must be at least 10.22m².
A room for one child under 10 must measure at least 4.64m², and any room smaller than this cannot be used as sleeping accommodation.
Understanding the room sizes for HMO before you buy, renovate, or let a property helps you avoid costly mistakes and ensures your investment meets legal requirements from the start.
What Are the Minimum Room Sizes for an HMO?
Understanding the legal minimum room sizes should be one of your first checks. As per the guidance for local housing authorities, the current national standards are:
|
Occupancy |
Minimum Room Size |
|
One person (aged 10 or over) |
6.51m² |
|
Two people (aged 10 or over) |
10.22m² |
|
One child (under 10) |
4.64m² |
|
Below 4.64m² |
Cannot be used as a bedroom |
These are the legal minimum room sizes. Always check your local council's HMO licensing requirements, as higher standards may apply.
HMO Minimum Room Size Rules: What Landlords Miss
Many landlords focus only on the room measurements and overlook other rules that affect whether a bedroom complies with HMO licensing standards. Some common mistakes are:
Ceiling height affects the measurement
Only the floor area where the ceiling height is more than 1.5 metres counts towards the room size. It is needed for rooms with sloping ceilings, where part of the floor space may not be included in the official measurement.
Local councils may require larger rooms
The national standards are the legal minimum, but they don't override local licensing conditions. Some councils require larger bedrooms or additional communal living space before granting an HMO licence.
Room layout matters
A bedroom might meet the required floor area but still be impractical because of awkward layouts, restricted headroom, or fixed features that reduce usable living space.
Legal Minimum Doesn't Always Mean Best Investment
Meeting the HMO minimum room size rules doesn't automatically mean you've bought the best investment.
Imagine you're comparing two similar HMOs in the same neighbourhood.
The first property has bedrooms that meet the legal minimum. The second offers slightly larger rooms with better layouts and more storage space.
Although both properties comply with the regulations, the second may attract stronger tenant demand, achieve higher rents, and experience fewer void periods because tenants often value comfort as much as location.
National Standards vs Local Council Requirements
One of the biggest mistakes landlords make is assuming the national rules are the only standards they need to meet.
The national HMO minimum room size regulations set the legal baseline across England. However, local HMO standards can apply additional licence conditions that require larger bedrooms, extra communal space, or different occupancy limits.
|
National Standards |
Local Council Requirements |
|
Apply across England |
Vary between local authorities |
|
Set the legal minimum room sizes |
May require larger bedrooms or additional amenities |
|
Cannot be lower than the statutory minimum |
Can introduce higher standards through HMO licensing conditions |
Meeting the national minimum doesn't automatically mean your property will satisfy local licensing requirements.
How Cribs Estates Helps HMO Investors
Cribs Estates has been helping landlords identify investment opportunities for over a decade. We ensure they match your goals whilst highlighting considerations that could affect future rental income.
From viewing suitable properties to understanding local market conditions, our team provides guidance throughout the buying process.
Once you've completed your purchase, our property management services support landlords with tenant management, maintenance coordination, inspections, and day-to-day property management, helping you protect your investment over the long term.
If you're planning to grow your portfolio, you may also find our guide on How to Maximise Your Buy-to-Let Investment Portfolio useful for long-term investment strategies.
FAQs
Does an en-suite count towards HMO room size?
Not always. Whilst the room itself may include an en-suite, some local authorities exclude the floor area occupied by personal washing facilities when assessing usable bedroom space. Always check your council's HMO standards before relying on the total room measurement.
Can councils require larger HMO bedrooms?
Yes. The national standards are the legal minimum, but local authorities have the power to apply higher room size standards through HMO licence conditions where appropriate.
What happens if one bedroom is below the minimum size?
A room measuring less than 4.64m² cannot be used as sleeping accommodation in a licensed HMO. Depending on the circumstances, it may need to be used for another purpose, such as storage or a study, rather than as a bedroom.
How are HMO rooms measured?
Measurements are taken from wall to wall, but only floor space where the ceiling height exceeds 1.5 metres is included. Sloping ceilings and unusable areas may reduce the official room size, so it's important to measure carefully before purchasing or converting a property.



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