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Vas Constructs
RUBBERCOVER™ EPDM Permaroof rubber cover and roof system. Lead flashing. NCTS. Timber Frame Buildings. Refurbish fit out, structural ...
Need to find an Extension Builder near you for all your extension buildering work?
BELLVIEW BUILDERS LTD provides a local, trusted extensio...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Harlesden, NW10
Experienced extension builder ready to quote for your work. Khetani Builders (UK) Ltd is the best extension builder in Harlesden. No obligation fre...
Patrick Gavin
Need an Extension Builder in Harlesden? NWL Renovations Ltd has been helping local clients (5 mile radius) with their extension buildering jobs fo...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
WHIPP CONSTRUCTION LTD is an established extension buildering business in Harlesden. We come highly recommended and provide competitive quotes for ...
C & A Contractors is a trusted extension builder serving customers in Harlesden and the surrounding area. Contact us to today to get a competitive ...
Krystian Wojasiewicz
Krystian Wojasiewicz is a trusted extension builder serving customers in Harlesden and the surrounding area. Contact us to today to get a competiti...
Samuele Paolini
Need an Extension Builder in Harlesden? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for ma...

Building a granny annexe ranges from £86,928 (BPS Building based in NW6) to £88,840 (1st & 2nd Fix Vasconstruct based in W12), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in Harlesden by posting a job with HaMuch. We will send it to extension builders in Harlesden who will be happy to help 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.

Underpin a building - £17,876

Two storey extension - £88,564

Build a timber frame extension - £26,376

Build a swimming pool - £81,376

Single storey extension - £62,520

Side return extension - £45,730

Install an RSJ - £2,576

Outbuilding - £10,376

Build a Mansard loft conversion - £52,376

Loft conversion - £37,275

Build a kitchen extension - £42,376

Hip to gable loft conversion - £42,376

Granny annexe - £87,376

Garden office - £10,376

Convert a Garage - £16,376

Garage - £18,876

Build a flat roof extension - £22,376

Build a dormer loft conversion - £42,376

Concrete foundations - £6,626

Convert a bungalow loft - £29,376

Convert a basement - £41,730