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 Monmouth?
In Monmouth, a garage conversion typically costs £16,500–£27,500 for a single integral garage, including VAT at 20% (standard rate). That range is adjusted for Wales, where domestic building work typically costs around 8% below the national average. 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 |
Your quote will depend mainly on:
- Single or double garage
- Heating and flooring
- Bathroom or kitchen
- Integral, attached or detached
Use the guide price tool to see how size and specification change the figure, then ask for a written, itemised quote.
Do you need planning permission for a garage conversion in Monmouth?
The approval route for Monmouth is set by planning law 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.
If the answer is not clear-cut, we can apply for formal confirmation before you commit to the build.
What we handle
From survey to sign-off, the job normally involves:
- Building control completion
- Drawings and building control application
- Wall and ceiling insulation
- Planning check for removed permitted development rights
- New wall and window to replace the garage door
- Electrics, heating and plastering
How long does it take?
Allow 3 to 6 weeks on site. Allow time beforehand for drawings and approvals, usually 6 to 12 weeks.
Building in Monmouth
Terraced houses in Welsh towns often have narrow plots, which suits rear and side return extensions and rear dormers.
Projects in Monmouth (NP25) are surveyed in person before we quote, so the price reflects your actual property.
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
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 Monmouth
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.
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 Monmouth?
In Monmouth, 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.
Do I need planning permission for a garage conversion in Monmouth?
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.
Do you build garage conversions in Monmouth?
Yes. We build garage conversions across Monmouth, including postcodes NP25. Every project starts with a free home visit.