What affects the cost?
Garage conversion budgets depend on whether the garage is integral, attached or detached, its floor area, insulation, structural changes, heating, electrics and whether the new room needs plumbing.
- Integral, attached or detached garage
- Single, double or partial conversion
- Insulation and damp proofing
- Windows, doors and structural work
- Heating and electrical upgrades
- Bathroom or kitchen additions
Typical cost breakdown
Regional planning examples
The examples below apply our published modelling factor to the same national benchmark. They are not claimed as observed city-wide average quotes.
Sources used for this guide
Garage Conversion Cost 2026: UK Price Guide
Published / checked: May 2026
Used for: Garage conversion totals, cost-per-m² and conversion-type benchmarks
Frequently asked questions
How much does a garage conversion cost per m²?
A current UK planning range is roughly £625–£1,250 per m², depending on garage type and specification.
Is a garage conversion cheaper than an extension?
Usually. You are adapting an existing structure rather than building a new external shell, although detached or heavily upgraded garages can cost more.
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