House to HMO conversion

In short: A house to HMO conversion turns a single-family home into a house in multiple occupation: a shared home for unrelated people with private bedrooms and shared kitchen or bathroom space. The works usually cover layout changes, fire separation and detection, extra bathrooms or ensuites, a larger kitchen, electrics, and the paperwork that licensing and building control will ask for.

What does house to HMO conversion include?

Measured survey and room-size check against the licensing standards
Layout drawings showing bedrooms, kitchens, bathrooms and the escape route
New stud walls, door openings and room splits
Fire doors, fire-rated linings and an interlinked fire alarm
Extra bathrooms, shower rooms or ensuites
A communal kitchen sized for the number of sharers
Rewiring or upgrades, with an electrical certificate
Decoration, flooring and a handover pack for licensing

When do landlords need it?

You have bought, or are buying, a house to let to sharers
A family let is moving to room-by-room letting
A council has said an existing shared house needs works before a licence

What rules apply in each UK nation?

The law differs between England, Wales, Scotland and Northern Ireland, and councils publish their own HMO standards on top. These are the points that usually matter for this work.

England

Mandatory HMO licence for 5 or more people in 2 or more households (since October 2018); councils can add additional licensing for smaller HMOs.
Licensed HMOs must meet national minimum bedroom sizes: 6.51 m² for one person aged 10 or over, 10.22 m² for two, and 4.64 m² for a child under 10.
National rules ask for an adequate number of bathrooms, WCs and basins and suitably located kitchens; numeric ratios are set by each council.
3–6 unrelated sharers is use class C4; changing from a family house is usually permitted development unless an Article 4 direction applies.

All HMO rules for England

Wales

Mandatory licence for HMOs with 3 or more storeys and 5 or more people in 2 or more households; Wales did not adopt England’s 2018 change.
England’s national room sizes do not apply in Wales; councils set their own room standards.
Kitchen and bathroom ratios are set in each council’s HMO standards.
3–6 sharers is use class C4, and in Wales changing a house to C4 always needs planning permission; only C4 back to C3 is permitted development.

All HMO rules for Wales

Scotland

Every HMO needs a council licence: 3 or more people who are not all from one or two families, sharing basic amenities. Licences last up to 3 years.
Room sizes are set by each council; East Lothian, for example, uses 6.5 m² for a single room with a shared lounge and kitchen, and 10 m² without.
Kitchen, WC and bathroom ratios come from council standards; one WC and one bath or shower per 5 people is a common figure.
Scotland has no C4 use class: up to 5 residents can fall within Class 9 (houses), and HMO planning policy is set by each council, some of which require permission at lower numbers.

All HMO rules for Scotland

Northern Ireland

A licence is needed where 3 or more people forming more than two households live as their main home and pay rent; the NI HMO Unit at Belfast City Council licenses for every council.
Space and amenity standards come from the HMO (Living Accommodation Standard) Regulations (NI) 2019 and the licence conditions.
Kitchens, bathrooms and WCs must meet the 2019 living accommodation standard regulations and licence conditions.
All new HMOs need planning permission; councils such as Belfast apply HMO policy areas and limits on concentration.

All HMO rules for Northern Ireland

How much does house to HMO conversion cost?

UK typical budget ranges. See local pages for regional guides.
Item	UK typical	Per
Typical 3–4 bed house to a 5–6 bed HMO, all-in	£30,000 – £75,000	project
Conversion works per letting room (walls, linings, electrics, decoration; excludes kitchens, bathrooms and fire systems; our estimate)	£3,500 – £6,500	letting room
Ensuite shower room added to a bedroom	£4,000 – £10,000	ensuite
Communal HMO kitchen with extra cooking and sink capacity (our estimate from domestic ranges)	£8,000 – £18,000	kitchen
Interlinked mains alarm system (Grade D type), small HMO (our estimate from installer guides)	£800 – £2,000	house

Typical time on site: 6–14 weeks. Your fixed price follows a site visit; use the guide-price tool for a figure for your house.

How the job runs

Free site visit and measured survey.
Itemised written quote and programme.
Works with one point of contact and photo updates.
Handover with certificates, drawings and photos.

Questions about house to HMO conversion

Do I need planning permission to turn a house into an HMO?

It depends on the nation, the council and the number of sharers. In England, three to six unrelated sharers is use class C4, and moving from a family house is usually permitted development unless the council has an Article 4 direction; seven or more normally needs permission. In Wales a change to an HMO always needs permission, in Northern Ireland all new HMOs need it, and in Scotland council policy decides. We check the address before drawings start.

How long does a house to HMO conversion take?

Most conversions of a three or four-bedroom house take six to fourteen weeks on site, after drawings and any approvals. Bigger layout changes, extensions or loft rooms add time.

Will the house pass licensing once the works are done?

We build to the standards your council publishes and give you the certificates and drawings an inspection asks for. The licence decision belongs to the licensing authority, so we never promise approval, but we design to meet the written standards from day one.

Can you work to a council’s HMO standards document?

Yes. Councils publish their own amenity and space standards. We read the one for your address and work to it, including kitchen and bathroom ratios.

What does house to HMO conversion include?

When do landlords need it?

What rules apply in each UK nation?

England

Wales

Scotland

Northern Ireland

How much does house to HMO conversion cost?

How the job runs

Questions about house to HMO conversion

Related services

Where we work

England

Wales

Scotland

Northern Ireland

Planning HMO works?