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Mick Singh
At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.
Ali Alagoz
Propello is an established and experienced local extension builder in Leyton. Please contact us for a free, no obligation quote and competitive ra...
From £17,676
MIHAI Martolea
Member since September 2026
Fedora and sons Ltd is a trusted extension builder serving customers in Leyton and the surrounding area. Contact us to today to get a competitive q...
Catalin CIOBANU
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in Leyton. No obligation free quotes an...
Relax... you have found a reliable extension builder in Leyton. M Saleem Builders is a friendly and reliable company based in Leyton who consider n...
UK Drywall Ltd is an established and experienced local extension builder in Leyton. Please contact us for a free, no obligation quote and competiti...
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 Leyton. Experienced in all extension buildering work and keeping within budget and on quote. GNB Cons...
Relax... you have found a reliable extension builder in Leyton. G HAMID CONSTRUCTION LTD is a friendly and reliable company based in Leyton who con...
Kaseno Group are here to help customers who need an Extension Builder in Leyton. We offer a competitive rate to complete all your extension builder...

Underpinning ranges from £17,420 (G HAMID CONSTRUCTION LTD based in E6) to £19,084 (Propello based in E17), 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 Leyton by posting a job with HaMuch and we will send it to extension builders in Leyton.
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 - £17,781

Two storey extension - £88,421

Build a timber frame extension - £26,281

Build a swimming pool - £81,281

Single storey extension - £60,616

Side return extension - £44,659

Install an RSJ - £2,481

Outbuilding - £10,281

Build a Mansard loft conversion - £52,281

Loft conversion - £36,383

Build a kitchen extension - £42,281

Hip to gable loft conversion - £42,281

Granny annexe - £87,281

Garden office - £10,281

Convert a Garage - £16,281

Garage - £18,781

Build a flat roof extension - £22,281

Build a dormer loft conversion - £42,281

Concrete foundations - £6,531

Convert a bungalow loft - £29,281

Convert a basement - £40,659