Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.64 (7 reviews)

Find affordable Brentford extension builders now

Extension builders rates in Brentford range from £37/hour £237/day (Elite Construction London Ltd) to £49/hour £306/day (RAID Architecture). To see prices and availability now for your job click green button.

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

"UC beam install 2.5m only (calculations done, building control notification done, no pretty boxing etc.)" - TW8, job posted 09/03/26

"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

"Underpinning a house" - TW7, job posted 06/05/25

"Basement conversion" - WEST EALING, job posted 03/05/25

"Loft conversion" - EALING, job posted 29/04/25

"Kitchen extension" - WEST EALING, job posted 24/04/25

Quickly find an Extension Builder in Brentford

Use these steps to find Extension Builders in Brentford for FREE!

Post your job: Click "Get quotes" and briefly describe your job.
Enter your details: We’ll match you with Extension Builders in Brentford. We’ll notify you via text or email when an Extension Builder is available to quote.
Select your Extension Builder: Compare Extension Builders interested in working with you. You can use HaMuch to safely message local Brentford Extension Builders or phone them directly - you’re in control!

Local Extension Builders in London Boroughs

Local Extension Builders in London Boroughs
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Extension Builders in Brentford
Extension Builders in Kew
Extension Builders in Osterley
Extension Builders in Ealing
Extension Builders in Chiswick
Extension Builders in West Ealing
Extension Builders in Hanwell
Extension Builders in Mortlake
Extension Builders in Acton
Extension Builders in Ham

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 - £26,176

Garden office - £10,176

Granny annexe - £87,176

Build a flat roof extension - £22,176

Convert a Garage - £16,176

Hip to gable loft conversion - £42,176

Convert a bungalow loft - £29,176

Build a dormer loft conversion - £42,176

Build a swimming pool - £81,176

Build a Mansard loft conversion - £52,176

Concrete foundations - £6,426

Underpin a building - £17,676

Two storey extension - £88,264

Convert a basement - £39,480

Side return extension - £43,480

Loft conversion - £35,400

Garage - £18,676

Single storey extension - £58,520

Outbuilding - £10,176

Install an RSJ - £2,376

Build a kitchen extension - £42,176

More extensions & conversions cost guides...

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