How Much Does a Garage Conversion Cost in the UK?
Converting a garage into a room is one of the most cost-effective ways to gain additional living space. Because the structure already exists, a garage conversion is significantly cheaper than building an extension.
Typical Cost (UK, 2026)
All costs are indicative estimates. Obtain at least 3 quotes from qualified builders. Prices exclude VAT (20%).
Factors Affecting the Cost
Type of garage
An integral garage (built into the house) is cheapest to convert. Attached garages cost more; detached garages are the most expensive to fully insulate and connect.
Insulation and damp proofing
The floor, walls, and roof all need proper insulation to building regulations standard.
New use
Converting to a bedroom is simpler than a bathroom or kitchen, which require plumbing work.
Structural work
Replacing the garage door with a wall and window is typically included in the basic conversion cost.
Cost Breakdown
| Item | Basic | Mid-range | High-end |
|---|---|---|---|
| Basic garage conversion (bedroom/living room) | £6,000 | £10,000 | £15,000 |
| Garage conversion with en-suite | £10,000 | £15,000 | £20,000 |
| Garage conversion to full kitchen/diner | £12,000 | £18,000 | £25,000 |
Costs are indicative and exclude VAT. Regional variations apply.
Typical Timeline
2–4 weeks
Frequently Asked Questions
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