What is HMO (House in Multiple Occupation)?

What is an HMO (house in multiple occupation)?

HMO (House in Multiple Occupation)

A property let to 3 or more people from 2 or more households who share facilities (kitchen, bathroom, toilet). Any HMO with 5 or more occupants from 2 or more households needs a mandatory HMO licence from the local authority. Many councils also operate additional licensing for smaller HMOs.

Reviewed by Erdem VolkanLast reviewed 16 September 2026How we check facts

Why it matters

What HMO (House in Multiple Occupation) means for a landlord

HMOs carry the highest regulatory load in the PRS, fire-safety, room-size, amenity standards and council licensing on top of the usual safety stack. The mandatory HMO rule (5+ tenants, 2+ households) is the easy case; additional licensing is where landlords miss obligations because it is designated borough-by-borough and renewed in cycles. Operating without a required licence is both a civil penalty up to £40,000 and grounds for a Rent Repayment Order of up to two years’ rent.

Worked example

How it plays out

A landlord in Nottingham turns a four-bed house into a five-bed shared house and lets the rooms to five students from 1 June 2026. With five people from more than one household sharing a kitchen, it needs a mandatory HMO licence, but no application has been made. When the council finds out, it can impose a civil penalty of up to £40,000, and the tenants can apply for a Rent Repayment Order of up to two years’ rent. Applying before the first tenant moved in would have given the landlord a defence while the council dealt with the application.

An illustrative example. Names, places and figures are made up.

Common mistakes

Where landlords go wrong

01Assuming the five-person rule is the only licensing duty, when many councils license smaller HMOs too.
02Granting one tenancy to a group of sharers and assuming that makes them a single household.
03Letting the property as an HMO before a licence application has been made: a valid application in progress is a defence, letting with none is not.
04Forgetting minimum room sizes (6.51m² for one adult, 10.22m² for two) in licensed HMOs.

What to do

A short checklist

Check mandatory and additional licensing for every address with the council.
Apply for any licence before the property is occupied as an HMO.
Measure every bedroom against the minimum sizes and keep the figures.
Check fire safety against your licence conditions before each new tenancy.

Sources

Checked against these sources on 16 September 2026. A guide to the rules in England, not legal advice: for a dispute or a possession claim, speak to a solicitor.