Garage Conversion Cost UK 2026
Single and double garage conversions — costs, building regulations and what to expect.
Converting a garage into living space is one of the most cost-effective ways to add a room to your home. Most single garages in UK homes are too small to fit a modern car comfortably but provide enough space for a home office, bedroom, gym, or playroom. A well-done garage conversion can add 10 to 15 percent to your property value.
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What the work involves
A typical garage conversion includes replacing the garage door with a brick wall and window (or French doors), insulating the walls, floor and ceiling, installing electrics and heating, plastering, flooring, and decoration. The existing garage floor is usually lower than the house floor, which means either raising the floor with insulation and a new screed, or accepting a small step down.
Building regulations
Garage conversions do not usually need planning permission (they are permitted development) but they always need building regulations approval. Key requirements include thermal insulation (walls, floor and roof must meet current U-value standards), fire safety (fire doors, smoke alarms), structural adequacy (the existing walls and roof must be suitable), damp proofing, ventilation, and drainage if adding a bathroom. Building regulations fees are typically £400 to £800.
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Our AI estimator gives you a full materials and labour breakdown for your specific project in under 60 seconds. Free, no signup needed.