What is an HMO?
The legal definition of an HMO and why it matters.
A House in Multiple Occupation (HMO) is a property rented out by at least three people who are not from one household (e.g., a family) but share facilities like the bathroom and kitchen. HMOs are subject to additional legal obligations that do not apply to standard tenancies.
Understanding whether your property is an HMO — and if so, what type — is the first step to compliance. Getting this wrong can result in criminal prosecution and unlimited fines.
The legal definition
Under the Housing Act 2004, a property is an HMO if it is occupied by three or more people forming two or more households, who share basic amenities (kitchen, bathroom, toilet). A "household" is a single person, a couple, or a family.
Common examples of HMOs: a shared house occupied by three or more unrelated people, a bedsit property where each room is let separately, a converted building where some units are not self-contained.
- Three or more occupants
- Forming two or more households
- Sharing basic amenities (kitchen, bathroom)
- Used as their only or main residence
Why it matters
HMOs are subject to: mandatory licensing (for larger HMOs), additional licensing (where the local authority has designated a scheme), HMO management regulations, higher fire safety standards, room size requirements, and additional amenity standards.
Operating an HMO without a licence (where one is required) is a criminal offence with an unlimited fine. The local authority can also apply for a Rent Repayment Order, requiring you to repay up to 12 months' rent.
Operating an unlicensed HMO is a criminal offence. Check whether your property requires a licence before letting it as an HMO.