How Much Does a Garage Conversion Cost in the UK?
Converting an integral or attached garage into a living room, office or bedroom is one of the cheapest ways to add usable floor space because the structure already exists.
A basic single-garage conversion at the low end; a double or high-spec conversion at the top.
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Cost by conversion
What affects the price
- •Replacing the garage door with an insulated wall and window.
- •Insulating and building up the floor (garage floors are usually lower than the house).
- •Insulating and lining the walls and ceiling, then plastering.
- •New electrics, heating (extending central heating) and possibly plumbing.
- •Flooring, decoration and Building Regulations approval.
Regional price variation
Labour is the biggest regional swing. London and the South East typically run 20–30% above the national average, while the North of England, Scotland and Wales tend to sit 5–15% below it. Material prices are fairly consistent nationwide — it is day rates that move the total. The ranges on this page assume South of England pricing unless stated.
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Frequently asked questions
How much does a garage conversion cost in the UK?
A garage conversion typically costs £6,000–£20,000. A basic single-garage conversion into a room is £6,000–£12,000, adding plumbing pushes it to £10,000–£16,000, and a double garage conversion is £12,000–£20,000.
Do I need planning permission for a garage conversion?
Converting a garage within the existing structure usually falls under permitted development and does not need planning permission, but it does need Building Regulations approval for insulation, fire safety, ventilation and structure.
Does a garage conversion add value?
A garage conversion typically adds around 10–15% to a property’s value if it creates a genuinely useful room, though in areas where off-street parking is scarce, losing the garage can offset some of the gain.