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 Antrim?
In Antrim, a garage conversion typically costs £15,500–£26,000 for a single integral garage, including VAT at 20% (standard rate). Building costs in Northern Ireland run about 14% below the UK average, and the figures for Antrim are adjusted to reflect that. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A single integral garage | £15,500–£26,000 |
| Higher specification | £26,000–£32,500 |
What moves the price most:
- Foundations under the old door opening
- Whether planning permission is needed
- Bathroom or kitchen
- Heating and flooring
For a figure based on your own measurements, try the guide price tool, then book a free home visit for a fixed quote.
Do you need planning permission for a garage conversion in Antrim?
Here is how the rules work for a garage conversion in Northern Ireland. In Northern Ireland a garage conversion usually does not need planning permission if permitted development rights apply, but building control approval is needed.
Northern Ireland has no Party Wall Act. Work on shared walls relies on agreement with the neighbour and common law, so we agree the arrangements in writing before work starts.
At the survey we check your house’s planning history and any restrictions, and tell you which route applies.
What we handle
The work we manage on a garage conversion:
- New wall and window to replace the garage door
- Floor raised with insulation and damp-proof membrane
- Foundation check under the garage door opening
- Drawings and building control application
- Electrics, heating and plastering
- Wall and ceiling insulation
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 Antrim
Northern Ireland has many detached and semi-detached homes on generous plots, which suits single-storey rear extensions and garage conversions.
We work across Antrim and neighbouring areas such as Ballymena, Newtownabbey and Belfast. Postcodes we cover in Antrim include BT41.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Design and pricing
Design options, then a fixed quote based on the chosen drawings and specification.
- 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 Antrim
How much does a garage conversion cost in Antrim?
In Antrim, a garage conversion typically costs £15,500–£26,000 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.
Do you build garage conversions in Antrim?
Yes. We build garage conversions across Antrim, including postcodes BT41. Every project starts with a free home visit.
Do I need planning permission for a garage conversion in Antrim?
In Northern Ireland a garage conversion usually does not need planning permission if permitted development rights apply, but building control approval is needed.
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.