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Trusted, recommended Extension Builders
Prices for extension builders in the UK
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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 £31. Extension Builder rates vary with location. For example, Griffiths Construction in Devon charges from £32 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

"Garden self contained annex" - B68, job posted 10/11/25

"Loft conversion" - COVENTRY, job posted 08/11/25

"RSJ installation also I will need help with the cost of theses below IRS extension either the following measurements. L-3m w-3.5m H-Item Site Preparation Groundworks & Foundations Floor Construction Superstructure Roof Construction Windows and External Doors Internal Works Electrical ..." - CR3, job posted 08/11/25

"Two storey extension, to square off the back of the house. This will open up the existing house for a new kitchen, utility and dining room downstairs. Upstairs will open up to create a larger master bedroom, dressing room and en suite." - MORAY, job posted 08/11/25

"Single storey extension" - STEVENAGE, job posted 08/11/25

"Loft conversion" - LEICESTER, job posted 08/11/25

"Side return extension" - REDBRIDGE, job posted 08/11/25

"Loft conversion" - BELFAST, job posted 08/11/25

"Loft conversion" - BELFAST, job posted 07/11/25

"Erection of a single-storey side and rear extension and a rear dormer extension. Alterations to include the installation of rooflights to the front roof slope and the conversion of an existing lean-to and WC into habitable space." - WILMSLOW, job posted 05/11/25

from 90 to 100 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.