What does a garage conversion cost in London?
In London: £15,000 to £27,500 at mid-range, including 20% VAT, against £12,000 to £22,000 nationally. Budget starts around £11,300, premium runs to £41,300. Set your finish level and region below, no email required.
Garage conversion, mid-range, London
£15,000 to £27,500
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 floor: garage slabs sit lower and colder than house floors; raising and insulating it is core work.
- The door opening: replacing the garage door with an insulated wall and window.
- Heating and electrics: extending the central heating and circuits into the new room.
- Integral versus detached: an integral garage converts cheaper than a detached one.
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. Outside London? See the national guide, or compare every region in the regional overview. How to pay for it (remortgage, loan or savings) is its own guide: paying for a renovation. Planning an extension or loft? Check permitted development first.
Frequently asked questions
Does a garage conversion add value?
Usually yes when it becomes a real habitable room with building regulations sign-off, and especially where bedrooms or home offices are scarce. An uninsulated conversion without sign-off does the opposite at survey time, so budget for doing it properly.
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.
Why is London so much more expensive?
Labour is the driver: London trades charge roughly 25% above the national average, and parking, access and waste logistics add friction. Nationally this project runs £12,000 to £22,000; the calculator switches region in one click.
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.