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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 £38. Extension Builder rates vary with location. For example, Fedora and sons Ltd in Ilford charges from £43 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

"Concrete foundation" - W1T, job posted 16/10/25

"Chimney opening or partial removal" - BD18, job posted 15/10/25

"Hi we’re looking for a quote into getting a small extension built We have bathroom and kitchen on back of house and wanting to open kitchen up We have a wall in between the kitchen and bathroom which needs knocking down for the extension to work otherwise it won’t be needed looking to find out..." - NE3, job posted 15/10/25

"Two storey extension" - , job posted 15/10/25

"Loft conversion" - BEACONSFIELD, job posted 15/10/25

"Loft conversion with or without a dormer" - BD4, job posted 14/10/25

"Underpinning" - , job posted 14/10/25

"2 story extension back of house extended kitchen extra 2 bedrooms" - NORTH TYNESIDE, job posted 13/10/25

"Garage conversion" - , job posted 13/10/25

from 110 to 120 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.