House to HMO conversion across Cornwall

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. We carry this out across Cornwall, priced against the HMO rules for England and the council’s own standards.

Nation: England
Pricing region: South West
Postcode areas: PL, TR, EX
Main towns: Redruth, Falmouth, St Austell, Truro, Camborne

What does house to HMO conversion in Cornwall involve?

New stud walls, door openings and room splits
Measured survey and room-size check against the licensing standards
Layout drawings showing bedrooms, kitchens, bathrooms and the escape route
Extra bathrooms, shower rooms or ensuites
Decoration, flooring and a handover pack for licensing
A communal kitchen sized for the number of sharers

Which rules apply in Cornwall?

Mandatory HMO licence for 5 or more people in 2 or more households (since October 2018); councils can add additional licensing for smaller HMOs.
Floor area under a ceiling lower than 1.5 m does not count towards the room size, and many councils set larger sizes.
Council standards often step up at 5 and 6 sharers, for example a separate WC at 5 and a second bathroom from 6.
3–6 unrelated sharers is use class C4; changing from a family house is usually permitted development unless an Article 4 direction applies.
A conversion can be a material change of use under the building regulations, so confirm with building control before work starts.

Councils in England can add additional licensing and Article 4 directions on top of the national rules. Check the council’s website for the exact address before you buy or start work.

How much does house to HMO conversion cost in Cornwall?

Regional adjustment for South West. Planning budgets: see our prices page.
Item	UK typical	Local guide	Per
Typical 3–4 bed house to a 5–6 bed HMO, all-in	£30,000 – £75,000	£31,200 – £78,000	project
Conversion works per letting room (walls, linings, electrics, decoration; excludes kitchens, bathrooms and fire systems; our estimate)	£3,500 – £6,500	£3,650 – £6,750	letting room
Ensuite shower room added to a bedroom	£4,000 – £10,000	£4,150 – £10,400	ensuite
Communal HMO kitchen with extra cooking and sink capacity (our estimate from domestic ranges)	£8,000 – £18,000	£8,300 – £18,700	kitchen
Interlinked mains alarm system (Grade D type), small HMO (our estimate from installer guides)	£800 – £2,000	£830 – £2,100	house

Typical time on site: 6–14 weeks. For a figure for your house, try the guide-price tool.

House to HMO conversion by town in Cornwall

Questions about house to HMO conversion in Cornwall

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.

Do you carry out house to HMO conversion across Cornwall?

Yes, across the whole of Cornwall, including Redruth, Falmouth, St Austell.

Who licenses HMOs in Cornwall?

HMOs in Cornwall are licensed by the local council for the address. Where an area has several councils, each runs its own licensing and planning policies.