06/09/2026
Most builders won't put a price online.
We think that leaves you guessing at 11pm with a tape measure in your hand, so here are ours.
Bristol loft conversion guide prices, 2026, ex VAT:
Dormer — £30,000 to £40,000
Hip-to-gable — £40,000 to £50,000
Mansard — £40,000 to £50,000
Velux room-in-roof — from about £40,000
What moves the number: where the staircase lands, whether there's an en-suite, the size of the steels, and how much glazing you want. A stair that has to be relocated rather than extended can be several thousand on its own.
What's always included in our quote: scaffolding, the engineer's calculations and steels, all the carpentry, insulation to current regs, the fire safety works a third storey needs, the staircase, first and second fix, plastering, building control fees through to the completion certificate, waste removal and the daily clean-down.
We don't mark up materials. The booking deposit is around 10% once you're in the diary — never a large sum up front.
Save this. Full 2026 cost guide, link in bio.
Link: https://wilsonandcoledevelopments.co.uk/loft-conversion-cost-bristol/