Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.64 (11 reviews)

Find affordable Rayners Lane extension builders now

Extension builders rates in Rayners Lane range from £31/hour £235/day (K Mccormack) to £48/hour £310/day (J B N BUILDING SERVICES LIMIT). To see prices and availability now for your job click green button.

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"Kitchen extension" - UB6, job posted 15/05/26

"Loft conversion" - HARROW, job posted 04/04/26

"I am seeking an estimate for a loft conversion. This should include structural design. Hip to gable dormer, with a toilet and sink." - UB5, job posted 01/04/26

"Loft conversion" - HARROW ON THE HILL, job posted 29/09/25

"Garden office" - HARROW ON THE HILL, job posted 20/07/25

"Loft conversion" - HARROW ON THE HILL, job posted 05/07/25

"Garage conversion" - PINNER, job posted 24/03/25

"Outbuilding" - HA4, job posted 11/03/25

"Loft conversion" - HARROW ON THE HILL, job posted 07/03/25

"Dormer loft conversion" - HARROW, job posted 14/08/24

"Loft conversion" - HARROW, job posted 09/08/24

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Local Extension Builders in London Boroughs

Local Extension Builders in London Boroughs
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Job estimates from extension builders near you

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.

Build a timber frame extension - £26,128

Garden office - £10,128

Granny annexe - £87,128

Build a flat roof extension - £22,128

Convert a Garage - £16,128

Hip to gable loft conversion - £42,128

Convert a bungalow loft - £29,128

Build a dormer loft conversion - £42,128

Build a swimming pool - £81,128

Build a Mansard loft conversion - £52,128

Concrete foundations - £6,378

Underpin a building - £17,628

Two storey extension - £88,192

Convert a basement - £38,940

Side return extension - £42,940

Loft conversion - £34,950

Garage - £18,628

Single storey extension - £57,560

Outbuilding - £10,128

Install an RSJ - £2,328

Build a kitchen extension - £42,128

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