In 40 seconds
A full garage conversion typically costs £6,000–£20,000 in 2026, with most complete conversions landing around £10,000–£20,000. Planning permission is usually not needed because converting a garage within its existing footprint normally falls under permitted development — though this does not apply to flats, listed buildings or homes in conservation areas, or where permitted development rights have been removed. Building regulations, however, always apply: the work must meet standards for insulation, damp-proofing, fire safety, ventilation and the structural infill of the old garage door opening. A single garage gives roughly 13–18m² of usable living space, which can add a room and may add value. Use a garage conversion specialist who handles building control, and get at least three itemised quotes. These are typical illustrations, not quotes.