Cost guide
How much does a loft conversion cost?
Published industry ranges by conversion type, so you can budget sensibly before getting a quote.
Our own rates for a loft conversion run £750-£2,500 per m² excluding VAT, depending on conversion type and specification tier - see the cost calculator for an estimate based on your loft. For general UK market context: a rooflight (Velux) conversion typically runs £22,500-£30,000, a dormer £40,000-£60,000 and a hip-to-gable £50,000-£70,000, according to Checkatrade and HomeOwners Alliance industry cost guides. Mansard conversions are priced at a flat £1,800 per m² excluding VAT, regardless of specification tier.
Last updated 17 August 2026
| Range | ||
|---|---|---|
| Our rate (all conversion types, all specification tiers) - our confirmed rate, excl. VAT | £750-£2,500 | Per m² |
| Rooflight (Velux) conversion - typical 30m² loft | £22,500-£30,000 | Total project |
| Dormer conversion - typical 30m² loft | £40,000-£60,000 | Total project |
| Hip-to-gable conversion - typical 30m² loft | £50,000-£70,000 | Total project |
| Mansard conversion - typical 30m² loft - general market figure; our own mansard rate is a flat £1,800/m² excl. VAT | £50,000-£80,000 | Total project |
| Per m² rate (all types, general market) | £1,250-£2,500 | Per m² |
Sources: Checkatrade (updated March 2026, figures verified by CIOB & RICS member estimators per Checkatrade), HomeOwners Alliance (2026 guide)
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
- The type of conversion your roof structure allows - a hip-to-gable or mansard involves more structural work than a rooflight conversion, and generally costs more as a result.
- Head height and whether the existing roof structure needs raising or restructuring to meet building regulations.
- Whether you're adding an en-suite bathroom, which brings in new plumbing runs.
- Roof window and dormer window specification.
- Structural work to strengthen the floor to take habitable-room loading.
These are general published ranges, not a quote. Get an estimate based on your own project.
Start Your ProjectWant a price based on our own rates, not a market average? Take the cost calculator quiz →
Want to understand what drives this cost, not just the numbers? Read how long does a loft conversion take? →
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Common questions
How much does a loft conversion cost? FAQs
Is this a fixed quote for my loft conversion?
No. The figures above are published UK industry ranges from Checkatrade and HomeOwners Alliance, 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?
The type of conversion your roof structure allows - a hip-to-gable or mansard involves more structural work than a rooflight conversion, and generally costs more as a result. Head height and whether the existing roof structure needs raising or restructuring to meet building regulations.
What's a typical our rate (all conversion types, all specification tiers) in per m² terms?
Our rate (all conversion types, all specification tiers) typically runs £750-£2,500 (per m²), for a our confirmed rate, excl. VAT, based on the sources cited above.
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