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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	£68
Average hourly rate of 9082 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 £40. Extension Builder rates vary with location. For example, Northern Garage Conversion in Westwood 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

"Single storey extension" - KINGS LYNN, job posted 01/01/26

"Single storey extension" - LU4, job posted 01/01/26

"Attic is already converted, but looking to alter to make space more useable. Potentially consider dormer or dormer windows and fitted storage." - NP18, job posted 30/12/25

"Loft conversion" - MK46, job posted 30/12/25

"Kitchen extension" - HARLOW, job posted 30/12/25

"Loft dorma conversion" - M45, job posted 29/12/25

"Hip to gable loft conversion" - , job posted 28/12/25

"Loft conversion" - RH10, job posted 27/12/25

"Kitchen extension" - HP21, job posted 27/12/25

"Kitchen extension" - MK40, job posted 27/12/25

from 90 to 100 of 9082

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.