What is a garage conversion?
A garage conversion turns an integral or attached garage into habitable space, such as a study, playroom, bedroom or utility. The garage door is replaced with a wall and window, the floor is raised and insulated, and the walls and roof are brought up to building regulations.
How much does a garage conversion cost in Southampton?
In Southampton, a garage conversion typically costs £20,000–£33,500 for a single integral garage, including VAT at 20% (standard rate). Building costs in the South East run about 12% above the UK average, and the figures for Southampton are adjusted to reflect that. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A single integral garage | £20,000–£33,500 |
| Higher specification | £33,500–£42,000 |
What moves the price most:
- Whether planning permission is needed
- Integral, attached or detached
- Heating and flooring
- Bathroom or kitchen
Your exact price depends on the survey and drawings. The guide price tool gives a quick range in the meantime.
Do you need planning permission for a garage conversion in Southampton?
The approval route for Southampton is set by planning law in England. In England converting an integral or attached garage usually does not need planning permission, unless a condition on the house removed permitted development rights (common on estates built in recent decades) or the house is listed. Building regulations approval is always needed.
Building regulations approval comes from the council’s building control service or a registered building control approver. The work is inspected at key stages, such as foundations, drainage and insulation, and a completion certificate is issued at the end.
At the survey we check your house’s planning history and any restrictions, and tell you which route applies.
What we handle
On a typical garage conversion we handle:
- New wall and window to replace the garage door
- Wall and ceiling insulation
- Electrics, heating and plastering
- Foundation check under the garage door opening
- Floor raised with insulation and damp-proof membrane
- Planning check for removed permitted development rights
How long does it take?
Expect 3 to 6 weeks on site. Allow time beforehand for drawings and approvals, usually 6 to 12 weeks.
Building in Southampton
The South East has a broad mix of housing, from Victorian terraces in the towns to post-war semis and newer estates, so extension types vary street by street.
We work across Southampton and neighbouring areas such as Hythe, Totton and Eastleigh. Postcodes we cover in Southampton include SO15.
How it works
- 01
Free visit
We look at the property, talk through what you want and measure up. There is no charge and no obligation.
- 02
Design and pricing
Design options, then a fixed quote based on the chosen drawings and specification.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Construction and completion
We build, put right any snags and hand over the building control certificate.
Questions about garage conversions in Southampton
Who approves a garage conversion in Southampton?
Planning matters in Southampton go to the council covering your address, and the work needs building control approval. We prepare and submit the applications for you.
Can a detached garage be converted?
Yes, but using it as separate living accommodation may need planning permission.
How much does a garage conversion cost in Southampton?
In Southampton, a garage conversion typically costs £20,000–£33,500 for a single integral garage, including VAT at 20% (standard rate). Your fixed price depends on the survey and drawings.
Do I need building regulations approval?
Yes. Converting a garage to a habitable room needs building control approval for insulation, ventilation, fire safety and the new wall.
How long does it take?
Typically 3 to 6 weeks on site.