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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 £30. Extension Builder rates vary with location. For example, Moores Roofing in Eye, Peterborough charges from £35 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

"Kitchen extension" - , job posted 03/09/25

"Build a dormer loft conversion" - SR3, job posted 02/09/25

"Loft conversion" - STOCKTON-ON-TEES, job posted 02/09/25

"Loft conversion" - , job posted 02/09/25

"RSJ installation 5.2 mx 300 wide to kitchen extension in Littlehampton" - LITTLEHAMPTON, job posted 01/09/25

"Basic 3 metre by 4 metre single extension to back of house" - COLCHESTER, job posted 01/09/25

"Basement conversion" - EDINBURGH, job posted 01/09/25

"Dormer loft conversion" - BRADFORD, job posted 31/08/25

"Single storey extension" - WELWYN, job posted 31/08/25

"Outbuilding" - , job posted 31/08/25

from 120 to 130 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.