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 South Glamorgan?
In South Glamorgan, a garage conversion typically costs £16,500–£27,500 for a single integral garage, including VAT at 20% (standard rate). Building costs in Wales run about 8% below the UK average, and the figures for South Glamorgan are adjusted to reflect that. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A single integral garage | £16,500–£27,500 |
| Higher specification | £27,500–£34,500 |
What moves the price most:
- Single or double garage
- Bathroom or kitchen
- Heating and flooring
- 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 South Glamorgan?
Whether you need planning permission depends on your house and its location in Wales. In Wales converting a garage usually does not need planning permission unless rights have been removed by a planning condition; building regulations approval is always needed.
The Party Wall etc. Act 1996 applies in Wales, so notices must be served before work on a shared wall, on the boundary, or excavation close to a neighbour’s foundations.
We check this for your address before design work starts, so there are no surprises later.
What we handle
From survey to sign-off, the job normally involves:
- Drawings and building control application
- Wall and ceiling insulation
- Building control completion
- Foundation check under the garage door opening
- Planning check for removed permitted development rights
- New wall and window to replace the garage door
How long does it take?
Expect 3 to 6 weeks on site. Before that, surveys, drawings and approvals usually take 6 to 12 weeks, longer if the council asks for changes.
Building in South Glamorgan
Wales has many terraced valley streets, stone cottages and post-war estates, so extension designs are shaped by slopes, materials and local character.
Towns we cover in South Glamorgan include Cardiff, Barry and Penarth.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Drawings and written quote
We prepare the design and give you a written, itemised quote with inclusions and exclusions.
- 03
Approvals in place
We handle planning, building control and neighbour notices before work starts.
- 04
Build and sign-off
We run the build to a written programme and hand over the completion certificate.
Questions about garage conversions in South Glamorgan
How much does a garage conversion cost in South Glamorgan?
In South Glamorgan, a garage conversion typically costs £16,500–£27,500 for a single integral garage, including VAT at 20% (standard rate). Your fixed price depends on the survey and drawings.
How long does it take?
Typically 3 to 6 weeks on site.
Do I need planning permission for a garage conversion in South Glamorgan?
In Wales converting a garage usually does not need planning permission unless rights have been removed by a planning condition; building regulations approval is always needed.
Who approves a garage conversion in South Glamorgan?
Planning matters in South Glamorgan 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.
Can the floor be level with the house?
Yes. The garage floor is raised and insulated to match the house floor level.