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 County Down?
In County Down, a garage conversion typically costs £15,500–£26,000 for a single integral garage, including VAT at 20% (standard rate). That range is adjusted for Northern Ireland, where domestic building work typically costs around 14% below the national average. 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 |
The biggest cost drivers are:
- Bathroom or kitchen
- Single or double garage
- Foundations under the old door opening
- Heating and flooring
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 County Down?
Approvals for a garage conversion in County Down follow the rules for 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.
Our first visit includes a check of your planning history, so you know the route before paying for drawings.
What we handle
The work we manage on a garage conversion:
- Building control completion
- Wall and ceiling insulation
- New wall and window to replace the garage door
- Drawings and building control application
- Floor raised with insulation and damp-proof membrane
- Electrics, heating and plastering
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 County Down
Northern Ireland has many detached and semi-detached homes on generous plots, which suits single-storey rear extensions and garage conversions.
Towns we cover in County Down include Bangor, Newtownards, Newry, Banbridge and Downpatrick.
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
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
Construction and completion
We build, put right any snags and hand over the building control certificate.
Questions about garage conversions in County Down
Will losing the garage affect parking?
Councils sometimes object if on-street parking is under pressure. We check local parking standards.
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.
Can the floor be level with the house?
Yes. The garage floor is raised and insulated to match the house floor level.
Do I need planning permission for a garage conversion in County Down?
In Northern Ireland a garage conversion usually does not need planning permission if permitted development rights apply, but building control approval is needed.
Who approves a garage conversion in County Down?
Planning matters in County Down go to the council covering your address, and the work needs building control approval. We prepare and submit the applications for you.
How much does a garage conversion cost in County Down?
In County Down, 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.