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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 £40. Extension Builder rates vary with location. For example, Sperin Interiors in Birmingham charges from £45 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

"Extend out 4.5m x 6m with all materials and labour included" - KY16, job posted 23/09/25

"Loft conversion" - HARROGATE, job posted 23/09/25

"Loft conversion" - LONDONDERRY, job posted 23/09/25

"Loft conversion" - STOKE-ON-TRENT, job posted 22/09/25

"Build a hip to gable loft conversion" - KT4, job posted 22/09/25

"I would like a loft conversion with a minimum cost such as velux/skylight conversion" - S13, job posted 21/09/25

"Single storey extension" - SOUTHPORT, job posted 21/09/25

"Side return extension" - CF24, job posted 21/09/25

"Kitchen extension" - HEMEL HEMPSTEAD, job posted 21/09/25

"Two storey extension" - , job posted 20/09/25

from 110 to 120 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.