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 St Austell?
In St Austell, a garage conversion typically costs £18,500–£30,500 for a single integral garage, including VAT at 20% (standard rate). Building costs in the South West are close to the UK average, so the figures for St Austell are close to our national guide. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A single integral garage | £18,500–£30,500 |
| Higher specification | £30,500–£38,000 |
The biggest cost drivers are:
- Single or double garage
- Heating and flooring
- Bathroom or kitchen
- Whether planning permission is needed
A guide range is only a starting point: the guide price tool gives an instant figure for your size, and a free survey turns it into a fixed quote.
Do you need planning permission for a garage conversion in St Austell?
Before anything is built in St Austell, we confirm which approvals apply 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.
We check this for your address before design work starts, so there are no surprises later.
What we handle
Handled as part of most garage conversions:
- New wall and window to replace the garage door
- Building control completion
- Floor raised with insulation and damp-proof membrane
- Foundation check under the garage door opening
- Wall and ceiling insulation
- Electrics, heating and plastering
How long does it take?
Allow 3 to 6 weeks on site. Design and approvals come first and typically take 6 to 12 weeks, depending on the approval route.
Building in St Austell
The South West mixes stone and render cottages with post-war and newer estates, and local materials matter more here when matching an extension.
We work across St Austell and neighbouring areas such as Truro, Newquay and Falmouth. Postcodes we cover in St Austell include PL25.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Permissions sorted
Applications, building control and neighbour arrangements, all before the start date.
- 04
Construction and completion
We build, put right any snags and hand over the building control certificate.
Questions about garage conversions in St Austell
Do I need planning permission for a garage conversion?
Usually not if the work is internal and the house keeps its permitted development rights. Many newer houses have planning conditions that remove those rights, in which case an application is needed.
Will losing the garage affect parking?
Councils sometimes object if on-street parking is under pressure. We check local parking standards.
How much does a garage conversion cost in St Austell?
In St Austell, a garage conversion typically costs £18,500–£30,500 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 a garage conversion take in St Austell?
Typically 3 to 6 weeks on site. Design and approvals beforehand usually take 6 to 12 weeks.