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Garage Conversion Cost Calculator UK
Estimate the 2026 cost of converting your garage into a habitable room — by size, finish and region. Instant result, no email needed.
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Choose your garage size, finish and region for an instant 2026 estimate.
2026 Price Guide
Garage conversion prices, 2026
| Type | Typical 2026 cost |
|---|---|
| Single garage – habitable room | £8,000 – £18,000 |
| Double garage | £15,000 – £28,000 |
| With en-suite / kitchenette | £18,000 – £35,000 |
Most internal conversions are permitted development but need Building Regulations sign-off. Full detail in the garage conversion cost guide.
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FAQs · 2026
Garage Conversion cost questions
A single garage conversion typically costs £8,000–£18,000 in 2026, a double £15,000–£28,000, and one with plumbing for an en-suite or kitchenette £18,000–£35,000.
Converting an attached garage within the existing walls is usually permitted development. Conservation areas, some new-build estates and changes to the external appearance can need permission.
Yes — a conversion needs Building Regs approval covering insulation, damp proofing, ventilation and structure, even when planning permission is not required.
Most garage conversions take 2–4 weeks depending on insulation, new openings and any plumbing or electrical work.
A well-finished conversion can add around 10–15% to a home's value, provided off-street parking is not essential to local buyers.
Last reviewed June 2026. Garage conversion figures reflect 2026 building quotes across UK regions, covering insulation, floor, openings and finishes. This calculator gives a budgeting estimate, not a quote. Editorial standards: /editorial-standards. See all free calculators or the cost guide hub.