Frequently asked questions about hiring a builder contractor

How much does it cost to build a house extension? 

Most UK extensions cost £1,500–£2,500 per square metre, depending on size, finish and location. A small extension might be £20,000–£40,000+, and bigger or two-storey builds cost more. A builder can give a clearer price after a site visit.

How much does it cost to build a house extension in London?

London extensions are usually £3,000–£4,500 per square metre, so a small rear extension might be £60,000–£100,000+, depending on size and finish.

How much does it cost to convert a garage into a room in the UK?

Most UK garage conversions cost £10,000–£25,000, depending on size and the level of finish.

How much does it cost to convert a garage into a room in London?

In London, a garage conversion typically costs £18,000–£35,000, depending on size and finish.

How much does a loft conversion cost in the UK?

For a regular loft conversion most homes pay around £50,000–£90,000, depending on size, conversion type and finish.

How much does a loft conversion cost in London?

In London you can expect roughly £55,000–£130,000 for a loft conversion — higher due to labour, materials & location.

How much does it cost to knock down a wall?

For a simple non-load-bearing internal wall, expect about £1,000–£2,000. For a load-bearing wall (needs a supporting beam/RSJ), typical cost is £1,500–£3,000+ depending on size and work needed.

How much does it cost to knock down a wall?

In London — because labour and materials cost more — a load-bearing wall removal can be up to £2,500–£3,500+, depending on complexity.

How much does it cost to remove a chimney breast?

It depends on what needs removing — but a typical chimney‑breast removal in the UK costs around £1,500–£3,000.

How much does it cost to remove a chimney breast in London?

In London, expect a bit more — usually around £1,500–£5,000, depending on size, complexity & whether you also remove the chimney stack.

How much does it cost to build a single‑storey extension?

Most UK single‑storey extensions cost about £2,200–£3,300 per square metre, depending on size and finish. So a 30 square metre extension might cost around £66,000–£99,000 (not including VAT or extra finishing).

How much does it cost to build a single‑storey extension in London?

In London the price is higher: roughly £3,100–£4,300 per square metre for a standard‑spec build. That means a 20–30 square metre extension might cost £60,000–£120,000+, depending on size, spec and extras.

How much does it cost to build a double‑storey extension?

In the UK most double‑storey extensions cost about £2,500–£3,500 per square metre, depending on size and finish.

How much does it cost to build a double‑storey extension in London?

In London expect roughly £3,500–£5,000 per square metre, because labour and materials tend to cost more there.

How much does a full house renovation cost?

Usually for a full renovation you might pay about £1,200–£2,800 per square metre. For example, a 100 square metre house might cost £120,000–£280,000, depending on the work and finish.

How much does a full house renovation cost in London?

In London you should expect costs to be higher. For an average full renovation, many homeowners pay in the ballpark of £180,000–£300,000+, depending on size, condition & specification. If you go for high‑end finishes or heavy structural work, the cost can go beyond that.