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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, Combined Building Services in Norfolk charges from £26 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

"Loft conversion" - HARROW ON THE HILL, job posted 07/03/25

"Quote to extended our house front out and up. To Match next doors" - EX12, job posted 07/03/25

"Side return extension" - , job posted 07/03/25

"Build a Single Storey Rear kitchen extension. 5.3m x 2.6m" - BS41, job posted 07/03/25

"Loft conversion" - BD22, job posted 06/03/25

"Swimming pool with swim jet with Jacuzzi circa 6x3 depth 1.2-1.6, steam and sauna room, changing room, toilet, bar area. building circa 6m W x 16m L x 4m H with frontage Bi fold windows. Please contact for more information" - DN7, job posted 06/03/25

"Loft conversion" - NEWPORT, job posted 06/03/25

"Swimming pool" - DN7, job posted 06/03/25

"Single storey extension" - SHEPPERTON, job posted 06/03/25

"TV aerial install" - B11, job posted 05/03/25

from 220 to 230 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.