- Nation
- England
- Pricing region
- South East
- Postcode areas
- SO, RG, GU, SP
- Main towns
- Southampton, Portsmouth, Basingstoke, Gosport, Waterlooville
What do loft conversions for extra rooms in Hampshire involve?
- Building control sign-off
- Planning or permitted development check
- Structural design and steelwork
- Feasibility and head-height check
- Ensuite where space allows
- Dormer or roof windows
Which rules apply in Hampshire?
- 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.
- Smoke alarms on every storey with living accommodation and CO alarms by fixed combustion appliances (other than gas cookers) are required by law.
- Floor area under a ceiling lower than 1.5 m does not count towards the room size, and many councils set larger sizes.
- Mandatory HMO licence for 5 or more people in 2 or more households (since October 2018); councils can add additional licensing for smaller HMOs.
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 do loft conversions for extra rooms cost in Hampshire?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Dormer loft conversion, about 30 m² | £40,000 – £60,000 | £44,800 – £67,200 | project |
| Rooflight loft conversion, about 30 m² | £22,500 – £30,000 | £25,200 – £33,600 | project |
Typical time on site: 6–10 weeks. For a figure for your house, try the guide-price tool.
Loft conversions for extra rooms by town in Hampshire
- Southampton
- Portsmouth
- Basingstoke
- Gosport
- Waterlooville
- Farnborough
- Eastleigh
- Winchester
- Havant
- Andover
- Fareham
- Fleet
- Totton
- New Milton
- Bordon
- Hythe
- Yateley
Questions about loft conversions for extra rooms in Hampshire
Does adding a loft room change the HMO planning position?
It can. Going from six to seven sharers moves a house into a large HMO in England, which normally needs planning permission. We check before design.
Will the loft room count for licensing?
Only the floor area with at least 1.5 metres of headroom counts towards the room size in England.
Do you carry out loft conversions for extra rooms across Hampshire?
Yes, across the whole of Hampshire, including Southampton, Portsmouth, Basingstoke.
Who licenses HMOs in Hampshire?
HMOs in Hampshire are licensed by the local council for the address. Where an area has several councils, each runs its own licensing and planning policies.
Other HMO services in Hampshire
- Extensions for extra rooms in Hampshire
- Large HMO conversions (7+ sharers) in Hampshire
- Escape routes, emergency lighting and fire stopping in Hampshire
- Ensuite installation in Hampshire
- Layout changes and room reconfiguration in Hampshire
- Fire alarm and detection systems in Hampshire
- Void and between-tenancy refurbs in Hampshire
- HMO fire safety upgrades in Hampshire