Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.65 (10 reviews)

Find affordable Chiswick extension builders now

Extension builders rates in Chiswick range from £38/hour £241/day (True Linear) to £60/hour £480/day (1st & 2nd Fix Vasconstruct). To see prices and availability now for your job click green button.

HaMuch is Excellent

How HaMuch saves you money

Post your job for free

We send your job to ALL Chiswick extension builders

Compare quotes

Available extension builders in Chiswick reply

Save Money

Select your affordable Chiswick extension builder

Post your job

Sort by

"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

"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

"Side return extension" - SW13, job posted 24/08/23

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

Quickly find an Extension Builder in Chiswick

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

Post your job: Click "Get quotes" and briefly describe your job.
Enter your details: We’ll match you with Extension Builders in Chiswick. 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 Chiswick Extension Builders or phone them directly - you’re in control!

Local Extension Builders in London Boroughs

Local Extension Builders in London Boroughs
Borough in London
Extension Builders in Chiswick
Extension Builders in Acton
Extension Builders in Barnes
Extension Builders in Hammersmith
Extension Builders in Mortlake
Extension Builders in Shepherd's Bush
Extension Builders in Brentford
Extension Builders in Kew
Extension Builders in Ealing
Extension Builders in West Kensington

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 - £26,224

Garden office - £10,224

Granny annexe - £87,224

Build a flat roof extension - £22,224

Convert a Garage - £16,224

Hip to gable loft conversion - £42,224

Convert a bungalow loft - £29,224

Build a dormer loft conversion - £42,224

Build a swimming pool - £81,224

Build a Mansard loft conversion - £52,224

Concrete foundations - £6,474

Underpin a building - £17,724

Two storey extension - £88,336

Convert a basement - £40,020

Side return extension - £44,020

Loft conversion - £35,850

Garage - £18,724

Single storey extension - £59,480

Outbuilding - £10,224

Install an RSJ - £2,424

Build a kitchen extension - £42,224

More extensions & conversions cost guides...

People in Chiswick searching for a Extension Builder also viewed...

Painter and Decorator

The Largest Database of UK Trade Rates

At HaMuch we know what tradespeople charge because we have the largest database of rates anywhere in the UK. If you want quotes for jobs at the right price for you, post your jobs with HaMuch and get your home improvements kickstarted straight away!

Appliance Repair Specialist

Conservatory Specialist