Starting a house extension in London can be exciting at the same time when it comes to the cost of building it, is the real challenge. The costs of house extension in Chiswick are very competitive and are at affordable prices. You need to have a rough idea of how much does house extension in Chiswick would cost before you start. Lets us see how much the different kinds of house extension costs.

Single storey:

The cost of building a single storey can differ from building in London and building in Chiswick. To do a house extension in Chiswick is cheaper compared to doing a house extension in London. Cost of living in London is more so the material price also increases because of this the house extension companies in London also charge more.
House extension in chiswick can cost anywhere around £1,300 – £1,600 per m2
House extension in London can cost anywhere around £1,600 – £2,100 per m2
This approximate estimation is excluding VAT, building regulation, planning permission and so on.

Double storey:

Double storey is similar to single storey extension, if you want the same exact model as the single storey then just double that cost of single storey.
Double storey in Chiswick can cost anywhere from £35,000 – £75,000
Double storey in London will be more costly compared to that in Chiswick.

Loft conversion:

Compared to single storey and double storey extension, loft conversion work can be done faster and a bit cheaper. In some cases it may cost more.
Loft extension in Chiswick can be from £20,000 minimum to maximum £50,000 depending on the size of the house.


Basement extension can cost more in London because it involves a lot of digging work that increases the labour charges.
Basement extension can cost minimum £50,000; maximum it can go up to £140,000.

Hope this information was useful to you. Get different quotes and choose the best.