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Select your affordable Forest Gate extension builder
From £17,380
Erald Kanani
Member since August 2025
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Relax... you have found a reliable extension builder in Forest Gate. Major Building Contractors Ltd is a friendly and reliable company based in For...
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
Experienced extension builder ready to quote for your work. Render is the best extension builder in Forest Gate. No obligation free quotes and many...
From £17,676
MIHAI Martolea
Member since September 2026
Fedora and sons Ltd is a trusted extension builder serving customers in Forest Gate and the surrounding area. Contact us to today to get a competit...
Catalin CIOBANU
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in Forest Gate. No obligation free quot...
Relax... you have found a reliable extension builder in Forest Gate. M Saleem Builders is a friendly and reliable company based in Forest Gate who ...
UK Drywall Ltd is an established and experienced local extension builder in Forest Gate. Please contact us for a free, no obligation quote and comp...
Sampson Essien
Thistle Bonding Coat: Ideal for use on low-suction backgrounds such as brick or concrete blocks, this product provided a solid foundation, Thi...
Trusted and professional extension builder in Forest Gate. Experienced in all extension buildering work and keeping within budget and on quote. GNB...

Underpinning ranges from £17,380 (Can design and Construction based in Ig11) to £18,212 (Render based in IG1), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in Forest Gate by posting a job with HaMuch and we will send it to extension builders in Forest Gate.
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 - £17,679

Two storey extension - £88,269

Build a timber frame extension - £26,179

Build a swimming pool - £81,179

Single storey extension - £58,584

Side return extension - £43,516

Install an RSJ - £2,379

Outbuilding - £10,179

Build a Mansard loft conversion - £52,179

Loft conversion - £35,430

Build a kitchen extension - £42,179

Hip to gable loft conversion - £42,179

Granny annexe - £87,179

Garden office - £10,179

Convert a Garage - £16,179

Garage - £18,679

Build a flat roof extension - £22,179

Build a dormer loft conversion - £42,179

Concrete foundations - £6,429

Convert a bungalow loft - £29,179

Convert a basement - £39,516