A garage conversion is one of the cheapest ways to add living space to your home. At £10,000 to £20,000, it costs a fraction of an extension and usually does not need planning permission.

When It Works

If your garage is integral, structurally sound, and you have off-street parking, a conversion makes excellent sense. You already have four walls, a roof, and foundations.

Cost Breakdown

A basic conversion costs £10,000-15,000. A higher spec with ensuite and underfloor heating runs £15,000-25,000.

Value Added

A well-done garage conversion adds 10-15% to your property value. On a £300,000 house, that is £30,000-45,000 of added value from a £15,000 investment.

🌳 Making the most of your outdoor space too? A deck next to a garage conversion creates a seamless indoor-outdoor living area. See decking costs in 2026.

🏡 What about the garden? After a garage conversion, many homeowners build a deck to make up for lost outdoor storage. See decking costs.