Small HMO conversions (3–6 sharers)

In short: A small HMO is a shared house for three to six unrelated people. Converting to a small HMO usually means making every bedroom big enough to let, adding a second bathroom or ensuites, enlarging the kitchen, and bringing fire safety up to the level the council expects for the size of house.

What do small HMO conversions (3–6 sharers) include?

Room-by-room size check before any work starts
Second bathroom, shower room or ensuites
Kitchen enlarged or refitted for the number of sharers
Interlinked smoke and heat detection
Fire doors to rooms off the escape route
Locks, door closers and thumb-turn locks on the exit route
Electrical upgrades and certificate
Decoration and durable flooring

When do landlords need it?

A three or four-bedroom house you want to let to sharers
You want a three to six sharer layout that fits the local planning rules
An existing small HMO needs bringing up to date

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 small HMO conversions (3–6 sharers) 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
Shared bathroom refit	£5,500 – £9,000	bathroom
Interlinked mains alarm system (Grade D type), small HMO (our estimate from installer guides)	£800 – £2,000	house
FD30S fire door leaf into an existing frame, with seals, closer and hinges, fitted	£300 – £600	door

Typical time on site: 4–10 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 small HMO conversions (3–6 sharers)

Does a small HMO need a licence?

In England a mandatory licence is needed when five or more people from two or more households share, and smaller HMOs can need one where the council runs additional licensing. Wales still applies a three-storey test, while in Scotland and Northern Ireland every HMO needs a licence. We check the address and tell you which applies before quoting.

How many bathrooms does a small HMO need?

National rules in England say amenities must be adequate for the number of sharers, and councils set the numbers: often a bathroom plus a separate WC at five people and a second bathroom from six. We work to the figure your council publishes.

Can I keep a lounge in a small HMO?

Yes, and many councils expect some shared living space where bedrooms are at the smaller end of the size range. We plan the layout so the house works for sharers and meets the local standard.

What is the smallest room I can let?

In a licensed HMO in England, a room for one person aged 10 or over must be at least 6.51 square metres, not counting floor under a ceiling lower than 1.5 metres. Councils can set larger sizes, and Wales, Scotland and Northern Ireland have their own standards. We measure every room before you commit to a layout.

What do small HMO conversions (3–6 sharers) include?

When do landlords need it?

What rules apply in each UK nation?

England

Wales

Scotland

Northern Ireland

How much do small HMO conversions (3–6 sharers) cost?

How the job runs

Questions about small HMO conversions (3–6 sharers)

Related services

Where we work

England

Wales

Scotland

Northern Ireland

Planning HMO works?