Price range
Low£27,500
Typical£50,000
High£75,000
Per project · VAT not stated · UK figures · Usually takes 6–10 weeks (our estimate)
What changes the price
- Type (rooflight/velux, dormer, hip-to-gable, mansard)
- Head height
- Stairs
- En-suite
- Steels
- Design and building control fees
Get a real price for your job
Every job is different. Get a written quote, ideally from 2 or 3 trades, before any work starts.
About these prices
Typical UK prices from published price guides, March 2026, VAT not stated. We check every figure against its source before it goes on this page. We haven't found reliable published figures for Greater Manchester alone, so local prices may be higher or lower. Once enough homeowners have shared real quotes with us, we'll show local figures here.