Cost guide
How much does a garage conversion cost?
Published UK ranges for converting a single or double garage.
A single garage conversion typically costs £7,000-£20,000 in the UK (averaging around £13,500-£15,000 for a standard 16m² garage), according to the Federation of Master Builders and Checkatrade - working out at roughly £625-£1,250 per m². A double garage conversion runs £12,000-£30,000, according to Resi.
Last updated 20 August 2026
| Range | ||
|---|---|---|
| Single garage conversion - typical 16m² garage | £7,000-£20,000 | Total project |
| Per m² rate | £625-£1,250 | Per m² |
| Double garage conversion - based on 15-30m² | £12,000-£30,000 | Total project |
Sources: Federation of Master Builders (typical range and 16m² average, checked August 2026), Checkatrade (per m² rate, checked August 2026), Resi (single and double garage figures, checked August 2026)
Key points
- Whether the garage is integral/attached or detached - a detached garage often needs more work to insulation and services to match the house.
- Whether the garage door opening is bricked up and rendered to match the existing elevation.
- Plumbing and electrics, if the new room includes a bathroom, kitchenette or dedicated heating circuit.
- Insulation and damp-proofing needed to meet Building Regulations for habitable space.
These are general published ranges, not a quote. Get an estimate based on your own project.
Start Your ProjectWant to understand what drives this cost, not just the numbers? Read do you need planning permission to convert a garage? →
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