Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.61 (9 reviews)

Find affordable W3 extension builders now

Extension builders rates in W3 range from £34/hour £226/day (CHURCHWOOD MANAGEMENT LTD) to £60/hour £480/day (1st & 2nd Fix Vasconstruct). To see prices and availability now for your job click green button.

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"Loft conversion" - EALING, job posted 25/06/26

"Hi there, I'm reaching out regarding a live opportunity at Heathrow Airport for the design, manufacture, and installation of a pre-fabricated pedestrian bridge next to the Longford Link Bridge. The contract is valued between £150k–£250k and runs until Jan 2027. CAS accreditation is required. If..." - W4, job posted 12/06/25

"Loft conversion" - W12, job posted 21/04/25

"Loft conversion" - W12, job posted 20/04/25

"Loft conversion" - W12, job posted 23/10/24

"Flat roof extension for a period mews terraced house. We'd like a bedroom extension with full bathroom and a roof top terrace. Footprint is roughly 8.5m x 6m." - W6, job posted 06/10/24

"Mansard loft conversion" - SHEPHERD'S BUSH, job posted 26/09/24

"Garage" - W3, job posted 18/06/24

"Basement conversion" - W4, job posted 07/08/23

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Select your Extension Builder: Compare Extension Builders interested in working with you. You can use HaMuch to safely message local W3 Extension Builders or phone them directly - you’re in control!

Local Extension Builders in London Boroughs

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Extension Builders in Ealing
Extension Builders in Shepherd's Bush
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Extension Builders in West Ealing
Extension Builders in Harlesden
Extension Builders in Brentford
Extension Builders in Kensington
Extension Builders in Barnes

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 - £26,240

Garden office - £10,240

Granny annexe - £87,240

Build a flat roof extension - £22,240

Convert a Garage - £16,240

Hip to gable loft conversion - £42,240

Convert a bungalow loft - £29,240

Build a dormer loft conversion - £42,240

Build a swimming pool - £81,240

Build a Mansard loft conversion - £52,240

Concrete foundations - £6,490

Underpin a building - £17,740

Two storey extension - £88,360

Convert a basement - £40,200

Side return extension - £44,200

Loft conversion - £36,000

Garage - £18,740

Single storey extension - £59,800

Outbuilding - £10,240

Install an RSJ - £2,440

Build a kitchen extension - £42,240

More extensions & conversions cost guides...

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