What does a loft conversion cost?
As a national mid-range guide: £45,000 to £60,000 for a Dormer version and £24,000 to £32,000 for a Velux (rooflight), including 20% VAT. Budget finishes start around £20,400 (Velux (rooflight)), premium runs to £87,500 (Hip to gable), and London adds a quarter. Set your finish level and region below for an instant estimate, no email required.
- Dormer: £45,000 to £60,000 mid-range
- Velux (rooflight): £24,000 to £32,000 mid-range
- Hip to gable: £55,000 to £70,000 mid-range
Loft conversion (Dormer), mid-range, Midlands
£45,000 to £60,000
Including 20% VAT. An indication, not a quote: prices vary per trade and property.
Take it further
Prices include 20% VAT. New builds and some energy-saving works can qualify for 0% or reduced VAT; ask your installer.
Got quotes in already? Check if they are fair. Want to know when the money leaves? See the phase-by-phase plan.
Extensions and loft conversions often fall under permitted development. Check before you budget.
What drives the price
- The type: a Velux conversion keeps the roof; a dormer or hip-to-gable rebuilds part of it.
- The stairs: fitting a compliant staircase is often the hardest puzzle of the project.
- Structure: new floor joists and steels are non-negotiable building regulations work.
- A bathroom up top: adds plumbing runs and a share of the boiler's capacity.
- Why no size input? UK guides price lofts per project: the type and the structure drive the bill far more than a metre of floor either way.
All figures come from the same validated 2026 price data as the calculator above (sources: Checkatrade, MyJobQuote and comparable national 2026 cost guides, checked August 2026; see how we price), so this page and your estimate can never disagree. Planning this in London? See the London guide, or compare every region in the regional overview. Planning an extension or loft? Check permitted development first.
Frequently asked questions
Which loft conversion type should I price first?
Start with the cheapest that fits your headroom: a Velux conversion if the ridge is high enough, a rear dormer when you need the headroom, hip-to-gable only when the roof shape demands it. The calculator prices all three; a mansard, the fourth type, usually tops even the hip-to-gable range and is not covered here. The planning check tells you which types stay within permitted development.
Do these prices include VAT?
Yes, all ranges include 20% VAT. New builds and some energy-saving works can qualify for 0% or reduced VAT; ask your installer whether your project applies.
How much does the region matter?
A lot: London typically runs 20 to 35 percent above the national average (this site plans with +25%, the quarter mentioned above), and the North of England, Scotland and Northern Ireland sit 10 to 20 percent below. The calculator adjusts for your region automatically, and the regional overview shows every factor.
How accurate is this range?
It is a guide range from national 2026 cost guides, adjusted for finish level and region. Real quotes vary per trade, property and specification; treat it as a starting point, budget 10 to 15 percent contingency, and always get at least three itemised quotes.