An HMO (House in Multiple Occupation) is a property rented out by at least 3 people who are not from a single household (i.e. not a family) and who share facilities like a kitchen or bathroom. Common examples include shared student houses, professional house shares, and bedsit-style accommodation. HMOs have additional legal requirements around licensing, room sizes, fire safety, and amenities compared to standard rental properties.

When do I need an HMO licence?

You MUST have a mandatory HMO licence if your property is occupied by 5 or more people forming 2 or more separate households and they share facilities (kitchen, bathroom, or toilet). Many councils also operate additional licensing schemes that require a licence for smaller HMOs (e.g. 3+ people from 2+ households). Some councils have selective licensing covering ALL rental properties. Check with your local council — failure to licence an HMO can result in fines of up to £30,000 or unlimited fines through prosecution.

What are the minimum room sizes for an HMO?

The national minimum room sizes for HMOs are: at least 6.51 sqm (70 sq ft) for a single person, at least 10.22 sqm (110 sq ft) for two people, and at least 4.64 sqm (50 sq ft) for a child under 10. These are the national minimums — your local council may set higher standards. A room smaller than 4.64 sqm cannot be used as sleeping accommodation at all. Room sizes are measured wall to wall and include fitted furniture but exclude corridors and en-suites.

Do I need planning permission for an HMO?

It depends on the size and your council's rules. Converting a house (C3 use class) to a small HMO for 3–6 people (C4 use class) is permitted development in many areas, so you don't need planning permission. However, many councils have introduced Article 4 directions that remove this PD right, meaning you DO need planning permission. For larger HMOs (7+ people, sui generis use class), you almost always need planning permission. Check with your local planning authority.

HMO Guide UK — Licensing, Rules & Mortgages for Houses in Multiple Occupation | PocketWise

HMOs can be lucrative investments but come with strict rules. Here’s the complete guide to running an HMO legally in the UK.

What Is an HMO?

Feature	Detail
Definition	A property occupied by 3+ people from 2+ separate households sharing facilities
Common examples	Student houses, professional house shares, bedsit accommodation
Key legislation	Housing Act 2004, Management of Houses in Multiple Occupation Regulations 2006
Licensing required	Mandatory for 5+ occupants from 2+ households; additional/selective licensing may apply for smaller HMOs

Types of HMO

Type	Description	Licensing
Small HMO (3–4 people, 2+ households)	Shared house	May need additional licensing (check local council)
Large HMO (5+ people, 2+ households)	Shared house or bedsits	Mandatory licence required nationally
Bedsit-type HMO	Individual rooms with shared facilities	Licensing depends on number of occupants and local rules
Purpose-built HMO	Designed/converted specifically as an HMO	Same licensing rules apply

HMO Licensing

Mandatory Licensing

Criteria	Requirement
Number of occupants	5 or more people
Number of households	2 or more separate households
Shared facilities	Share a kitchen, bathroom, or toilet
Applies nationally	Yes — all councils
Fee	Typically £500–£1,500 (varies by council)
Duration	Usually 5 years

Additional and Selective Licensing

Scheme	What it covers
Additional licensing	Smaller HMOs (e.g. 3+ occupants) in specified areas
Selective licensing	ALL private rented properties in specified areas
How to check	Contact your local council — schemes vary hugely

What Happens If You Don’t Get a Licence

Consequence	Detail
Civil penalty	Up to £30,000
Prosecution	Unlimited fine
Rent Repayment Order	Tenants can reclaim up to 12 months’ rent
Inability to serve Section 21	Cannot evict tenants using a no-fault notice

Minimum Room Sizes

Occupancy	Minimum floor area
1 person (over 10)	6.51 sqm (70 sq ft)
2 people (over 10)	10.22 sqm (110 sq ft)
Child under 10	4.64 sqm (50 sq ft)
Room under 4.64 sqm	Cannot be used as sleeping accommodation

Note: Your local council may set higher minimums. Room size is measured wall to wall and can include built-in wardrobes but not en-suites in most councils’ calculations.

Amenity Standards

Kitchen Facilities

Number of occupants	Minimum requirements
Up to 5	1 cooker, 1 sink, 1 fridge-freezer + adequate worktop and storage
6–10	2 sets of facilities or a larger kitchen
10+	Additional facilities proportional to occupants

Bathroom Facilities

Number of occupants	Minimum requirements
Up to 4	1 bathroom (bath or shower) + 1 toilet
5	1 bathroom + 1 separate toilet (or 2 bathrooms)
6–10	Additional bathrooms proportional — typically 1 per 4–5 occupants

Fire Safety

Requirement	Detail
Smoke alarms	On every floor (mains-powered, interlinked)
Heat alarm	In the kitchen
Fire doors	On all bedrooms and kitchens (FD30 rated — 30 minutes fire resistance)
Fire blanket	In the kitchen
Emergency lighting	In corridors and escape routes
Fire escape route	Clear, unobstructed route from every room to outside
Fire risk assessment	Must be carried out and documented
Fire extinguishers	May be required depending on risk assessment

Planning Permission

Scenario	Planning permission needed?
House (C3) → small HMO, 3–6 people (C4)	Usually no (permitted development) — BUT check for Article 4 direction
House (C3) → small HMO (C4) in Article 4 area	Yes
House → large HMO, 7+ people (sui generis)	Yes
Extending or significantly altering an existing HMO	Possibly — depends on the work

HMO Mortgages

Feature	Detail
Standard buy-to-let mortgage	Not suitable for HMOs (lender consent needed)
HMO mortgage	Specialist product for licensed HMOs
Deposit	Typically 25–30% (higher than standard BTL)
Interest rates	Typically 0.5–1% higher than standard BTL
Lenders	Specialist lenders: The Mortgage Works, Paragon, Kent Reliance, Aldermore
Valuation	Lender assesses on room-by-room rental income
Rental yield	HMOs typically yield 8–15% gross (vs 4–7% for standard BTL)

Landlord Responsibilities

Responsibility	Detail
HMO licence	Obtain and maintain
Gas safety	Annual Gas Safety Certificate (CP12)
Electrical safety	EICR every 5 years (or as required by licence)
Fire safety	Risk assessment, alarms, fire doors, extinguishers
Room sizes	Meet minimum standards
Amenities	Adequate kitchen and bathroom facilities
Waste management	Provide sufficient bins and collection
Property management	Keep common areas clean and in good repair
Display licence	Some councils require this
Tenant references	Some councils require reference checks

HMO Investment: Pros and Cons

Pros	Cons
Higher yields (8–15%)	More management-intensive
Reduced void risk (one vacancy doesn’t mean zero income)	Higher setup costs (fire doors, alarms, furnishing)
Strong tenant demand (professionals, students)	Stricter regulations and licensing
Scalable income (add rooms = add income)	Higher mortgage rates and larger deposits
	More tenant turnover
	Council licensing fees and inspections