Cost guide
How much does a garage conversion cost?
Published UK ranges for converting a single or double garage.
Our own rates for a garage conversion run £625-£3,000+ per m² excluding VAT, depending on specification tier - use the cost calculator for an estimate based on your project. For general UK market context, a single garage conversion typically costs £7,000-£20,000 (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 | ||
|---|---|---|
| Our rate (all specification tiers) - our confirmed rate, excl. VAT - Diamond-spec runs £3,000/m² and beyond | £625-£3,000 | Per m² |
| Single garage conversion (market) - typical 16m² garage | £7,000-£20,000 | Total project |
| Per m² rate (market) | £625-£1,250 | Per m² |
| Double garage conversion (market) - 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)
Worth knowing
The market ranges below are general UK industry figures, shown for comparison. Use the cost calculator for a personalised estimate based on our own current rates.
These are general UK ranges. We build across the North West, including Darwen, Blackburn and the wider Lancashire and Greater Manchester area - site access, local trade rates and travel distance can move your actual price within (or occasionally outside) the range above.
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.
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Want to understand what drives this cost, not just the numbers? Read do you need planning permission to convert a garage? →
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Common questions
How much does a garage conversion cost? FAQs
Is this a fixed quote for my garage conversion?
No. The figures above are published UK industry ranges from Federation of Master Builders and Checkatrade and Resi, not a quote for your project. An accurate price depends on a site survey and your specific requirements - get in touch for an estimate based on your own project.
What actually drives the price up or down?
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.
What's a typical our rate (all specification tiers) in per m² terms?
Our rate (all specification tiers) typically runs £625-£3,000 (per m²), for a our confirmed rate, excl. VAT - Diamond-spec runs £3,000/m² and beyond, based on the sources cited above.
Other cost guides
More published cost ranges
How much does a loft conversion cost?
Published industry ranges by conversion type, so you can budget sensibly before getting a quote.
How much does a house extension cost?
The published UK per-m² rate for a single-storey extension, and what actually moves it.
How much does a two storey extension cost?
Published per-m² rates by build quality, and what a typical two-storey extension runs in total.
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