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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 £37. Extension Builder rates vary with location. For example, A-Pex Building in Dover charges from £22 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

"Garage conversion" - ROCHDALE, job posted 18/06/25

"Flat roof extension" - , job posted 18/06/25

"Loft conversion" - , job posted 18/06/25

"Kitchen extension" - WOLVERHAMPTON, job posted 17/06/25

"Single storey extension" - GU1, job posted 17/06/25

"Side extension connecting to existing rear extension." - ROCHDALE, job posted 14/06/25

"Need an extension builder" - CV4, job posted 14/06/25

"Loft conversion" - PL14, job posted 14/06/25

"Extend kitchen and add conservatory with shed at the end. If possible a small room as well for downstairs toilet between conservatory and shed. Terraced house." - LA13, job posted 14/06/25

"Kitchen extension" - , job posted 14/06/25

from 160 to 170 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.