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Trusted, recommended Extension Builders
Prices for extension builders in the UK
Find a local builder who can convert your loft or build a side return extension at a great price
Find out how much extension builder jobs cost

Low	Average	High
£13	£34	£86
Average hourly rate of 9110 extension builders in the UK excluding VAT or callout charge

Extension Builders in the UK. The average hourly rate of the 10 Extension Builders listed is £35. Extension Builder rates vary with location. For example, Ali & Sons Builders in LONDON charges from £42 per hour.

When hiring Extension Builders in the UK get multiple quote to compare prices and services.

Basement Garage House extension Loft Side return

Trusted, recommended Extension Builders

"Want to build a outbuilding 6meters by 4 meters with brick fibre roof 1 double glazing door 1 glazing window will need to do electrics to the outhouse fit in lighting and plug sockets" - HESTON, job posted 08/05/25

"Need an extension builder" - CV4, job posted 08/05/25

"Need an extension builder" - RG30, job posted 08/05/25

"RSJ installation" - SLOUGH, job posted 07/05/25

"Granny annexe" - THANET, job posted 07/05/25

"Loft conversion" - TW14, job posted 07/05/25

"Garage conversion" - ME7, job posted 07/05/25

"Need an extension builder" - LIVERPOOL, job posted 06/05/25

"Single storey extension" - HOVE, job posted 06/05/25

"Double Garage conversion, separate to the house. French Bifold doors, 2 offices at the back with bricked up garage doors and tall windows put in with double glazed panels for walls to get natural light in. Storage space for bikes etc at the side with current door entrance, living space at the front...." - CT18, job posted 06/05/25

from 180 to 190 of 9110

Find out how much extension builder jobs cost

Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.