How much does a garage conversion cost?

As a 2026 UK guide, the cost of a garage conversion for a basic room such as a home office or utility room tends to sit around £8,000 to £14,000, a mid-range room such as a bedroom or family room with an en-suite around £14,000 to £22,000, and a high-spec annexe or open-plan living area around £22,000 and upwards. The final figure depends on the size of your garage, the condition of the existing structure and how you plan to use the new living space, which is why an itemised quote is the only way to get an accurate number for turning your garage into additional living space.