Converting the garage is one of the cheapest ways to add a proper room to a South London home — you already have the walls, the floor and the roof, so you’re mostly paying to insulate, finish and bring it up to building regs. Here’s what it typically costs, and what moves the price.
| Type of job | Guide price |
| Garage to home office or gym (simple) | £8,000 – £14,000 |
| Garage to habitable room (insulated, heated, to regs) | £13,000 – £22,000 |
| Garage to bedroom with en-suite | £18,000 – £30,000 |
| Detached garage: demolish & new garden room | £13,000 – £25,000 |
These are indicative labour-and-materials ranges for South-East London, to help you budget — not a quote. Every job is different; the only accurate figure is one from a site visit. Labour-only is less where you supply the materials.
Tell me what you’re planning and I’ll come and give you a straight, itemised quote — no pressure.
