HMO rules and licensing explained

Any property with five or more occupiers from two or more households needs a mandatory HMO licence.

8 min read · Updated 2 August 2026

Overview

A house in multiple occupation is a property occupied by three or more people forming more than one household who share a facility such as a kitchen or bathroom. Mandatory licensing applies at five or more occupiers in two or more households. Councils may also operate additional licensing covering smaller HMOs.

Why it matters

Operating an unlicensed HMO is a criminal offence. Councils can issue civil penalties of up to £30,000 per offence, and tenants or the council can apply for a rent repayment order for up to 12 months' rent.

Legal requirements

Apply for a mandatory licence where five or more occupiers form two or more households.
Meet minimum room sizes — 6.51 sqm for one adult, 10.22 sqm for two — and amenity standards.
Comply with the HMO Management Regulations covering fire safety, water, waste and common parts.
Display the licence and comply with all licence conditions, including declared occupancy limits.

Common mistakes

Assuming a family plus a lodger is never an HMO.
Missing an additional licensing scheme that covers three- and four-person HMOs.
Letting a room under the minimum size, which is a licence breach in itself.
Not renewing before expiry — the property is unlicensed the moment the licence lapses.

Practical guidance

Check both mandatory and additional schemes with the council before you let.
Budget for fire doors, interlinked detection and emergency lighting at the outset.
Keep a per-room tenancy record so occupancy always matches the licence.
Diarise licence renewal at least three months before expiry.

Frequently asked questions

When do I need an HMO licence?

Mandatory licensing applies where five or more occupiers form two or more households. Councils may also license smaller HMOs under additional schemes.

What is the minimum bedroom size in an HMO?

6.51 square metres for one adult and 10.22 square metres for two adults sharing.

Related guides

Selective licensing for landlords

Selective licensing can require a licence for an ordinary single-family let.

Smoke alarm rules for rented property

At least one smoke alarm is required on every storey used as living accommodation.

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This guide is general information for UK landlords and letting agents, not legal advice. Rules differ across England, Wales, Scotland and Northern Ireland — check your local requirements or take advice before acting.