Large HMO conversions (7+ sharers)

In short: A large HMO is a shared house for seven or more people. In England it falls outside the C4 use class, so it normally needs planning permission, and a building this size usually needs a more extensive fire alarm, protected escape route and extra kitchen and bathroom capacity.

What do large HMO conversions (7+ sharers) include?

Feasibility review and measured survey
Planning and building control drawings, coordinated with your designer
Fire alarm and detection system sized for the building
Protected stair and landing with fire doors and fire stopping
Emergency lighting where the escape route needs it
Second kitchen or extra kitchen capacity
Ensuites or extra bathrooms
Sound insulation between rooms and floors

When do landlords need it?

A large house, three or more storeys, or a building with lots of rooms
You have planning in place, or want to apply
An existing large HMO needs works before a licence renewal

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 do large HMO conversions (7+ sharers) cost?

UK typical budget ranges. See local pages for regional guides.
Item	UK typical	Per
Conversion works per letting room (walls, linings, electrics, decoration; excludes kitchens, bathrooms and fire systems; our estimate)	£3,500 – £6,500	letting room
Panel alarm system (Grade A type), larger HMO	£1,750 – £4,500	house
Protected route upgrades: fire-resisting linings, fire stopping, lighting (three-storey house, our estimate)	£2,000 – £6,000	house
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

Typical time on site: 10–20 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 large HMO conversions (7+ sharers)

Does a seven-bed HMO need planning permission?

In England, normally yes: seven or more unrelated sharers is a sui generis use outside class C4. Wales and Northern Ireland require permission for new HMOs anyway, and in Scotland more than five residents falls outside the houses class. Councils also apply concentration policies, so we check the address first.

What fire alarm does a large HMO need?

The fire risk assessment and the council decide; alarm grades come from guidance, not statute. For larger HMOs, council guides and the NI fire service guide commonly point to a Grade A panel system covering escape routes and rooms. We fit to the specification set, and give you the commissioning certificate.

Do you handle building control?

Yes. The building work in a large HMO conversion (partitions, fire separation, drainage, electrics) needs to meet the building regulations, and the conversion can also count as a material change of use. We confirm the route with building control, coordinate inspections and give you the completion paperwork.

Can you work with my architect?

Yes. We often build from an architect’s drawings, or we can recommend a designer to prepare them.

What do large HMO conversions (7+ sharers) include?

When do landlords need it?

What rules apply in each UK nation?

England

Wales

Scotland

Northern Ireland

How much do large HMO conversions (7+ sharers) cost?

How the job runs

Questions about large HMO conversions (7+ sharers)

Related services

Where we work

England

Wales

Scotland

Northern Ireland

Planning HMO works?