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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 £41. Extension Builder rates vary with location. For example, Pro-Tec Roofing & Building Services Ltd in 18 Beverley Ave, Sidcup, KENT charges from £41 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

"Underpinning - Soil test, engineer and designed drawings and Traditional underpinning" - TN24, job posted 13/08/25

"RSJ installation" - GU3, job posted 13/08/25

"I would like to do a loft in my 3 bedroom house." - BS10, job posted 12/08/25

"Two storey extension" - STOKE-ON-TRENT, job posted 12/08/25

"Swimming pool" - , job posted 12/08/25

"Build a mansard loft conversion" - S5, job posted 12/08/25

"New toilet extension" - NEWCASTLE-UNDER-LYME, job posted 10/08/25

"Kitchen extension" - , job posted 10/08/25

"Build a dormer loft conversion" - SO17, job posted 10/08/25

"Cost of a loft conversion" - SO17, job posted 10/08/25

from 130 to 140 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.