- Nation
- England
- Pricing region
- South East
- Postcode areas
- SO, RG, GU, SP
- Main towns
- Southampton, Portsmouth, Basingstoke, Gosport, Waterlooville
What do extensions for extra rooms in Hampshire involve?
- Foundations, structure and roof
- Party wall coordination where needed
- Building control completion
- Fire separation and detection extended to the new space
- Kitchen or bedroom fit-out
- Planning route check and drawings
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.
- Council standards often step up at 5 and 6 sharers, for example a separate WC at 5 and a second bathroom from 6.
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
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 extensions for extra rooms cost in Hampshire?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £39,200 – £67,200 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £2,000 – £4,500 | m² |
Typical time on site: 8–14 weeks. For a figure for your house, try the guide-price tool.
Extensions 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 extensions for extra rooms in Hampshire
Can I extend an HMO under permitted development?
Some extensions to houses are permitted development, but rules differ for HMOs and by nation and council. We check the address before design.
Is a kitchen extension worth it?
Often, when the existing kitchen limits how many people the council will allow. A bigger kitchen can unlock an extra room.
Do you carry out extensions 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
- Loft conversions for extra rooms in Hampshire
- Communal kitchen refits in Hampshire
- Layout changes and room reconfiguration in Hampshire
- Large HMO conversions (7+ sharers) in Hampshire
- Ensuite installation in Hampshire
- House to HMO conversion in Hampshire
- Void and between-tenancy refurbs in Hampshire
- Sound insulation in Hampshire