How much extensions cost

Rough bands people meet

These are wide bands talked about in the mid-2020s, not a price for your house and not a statistic from one council. A simple single-storey rear extension is often quoted somewhere between about £20,000 and £60,000 or more, depending on size, kitchens, structure and finish.

A loft conversion is often quoted from about £30,000 to £70,000 or more. A two-storey extension is often quoted from about £50,000 to well over £100,000. A straightforward garden room can be under £15,000, or past £40,000 if it is large and highly finished.

What moves the number

London labour, a tight site, steels, a new kitchen, underfloor heating, and a basement all push the price up. A garage conversion that stays inside the existing shell is usually cheaper than a new extension.

Get at least two builder quotes after you have drawings. Do not offer a price for a house that only works at the bottom of a range.

Check with your council. Rules change, and every house is different.

Questions