Garage Conversion Cost Calculator — UK Prices 2025
Garage Conversion Cost Calculator
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Include insulation?
Include plumbing?
For en-suite or utility room
Electrical upgrade?
Urgent?
Adds ~20% to labour
Prices automatically adjust for your region
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How much does garage conversion cost in the UK?
Use our calculator above to get an accurate estimate based on your specific requirements. Prices are based on real quotes from UK tradespeople and updated quarterly.
What affects the cost of garage conversion?
- Location: London and the South East are 15–40% more expensive than the national average.
- Size and complexity: Larger or more complex jobs cost proportionally more.
- Material quality: Budget, mid-range and premium specifications can vary by 2–3x.
- Time of year: Demand peaks in spring and summer — book in winter for better availability and pricing.
- Access: Difficult access (scaffolding, confined spaces) adds to labour costs.
How to save money on garage conversion
- Get at least 3 quotes from different tradespeople.
- Book during quieter periods (January–March for most trades).
- Be flexible on start dates — tradespeople often discount for convenient scheduling.
- Supply your own materials where possible (but confirm with your tradesperson first).
- Combine jobs — having multiple trades on site at once can reduce overall costs.
How to find a good tradesperson
Always check reviews on Checkatrade, Rated People or MyBuilder. Ask for references from recent similar jobs. Ensure they are appropriately qualified and insured. Never pay the full amount upfront — a deposit of 10–25% is standard.
Frequently asked questions
How much does a garage conversion cost in the UK?
A basic garage conversion costs £6,000–£12,000. A conversion with plumbing (e.g. bedroom with en-suite) costs £10,000–£20,000. A high-spec conversion with underfloor heating and premium finishes can cost £20,000+.
Do I need planning permission for a garage conversion?
Most garage conversions are permitted development and do not require planning permission. However, you will need Building Regulations approval for insulation, structural work, fire safety and ventilation.
How long does a garage conversion take?
A straightforward garage conversion takes 3–6 weeks. A conversion with plumbing and complex electrical work takes 6–10 weeks.
Does a garage conversion add value?
Yes. A garage conversion typically adds 10–15% to a property's value. It is one of the most cost-effective ways to add living space, as the structure already exists.
Can I convert a detached garage?
Yes, but a detached garage conversion is more complex and expensive than an integral or attached garage, as it requires connecting services (electricity, heating, potentially plumbing) from the main house.