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Propello
Ali Alagoz
Propello is an established and experienced local extension builder in Walthamstow. Please contact us for a free, no obligation quote and competiti...
Bspec Ltd
Mick Singh
At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.
M Saleem Builders
Relax... you have found a reliable extension builder in Walthamstow. M Saleem Builders is a friendly and reliable company based in Walthamstow who ...
UK Drywall Ltd
UK Drywall Ltd is an established and experienced local extension builder in Walthamstow. Please contact us for a free, no obligation quote and comp...
KS Plastering SERVICE
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...
Kaseno Group
Kaseno Group are here to help customers who need an Extension Builder in Walthamstow. We offer a competitive rate to complete all your extension bu...
2nwest Builders and Decorators Ltd
Relax... you have found a reliable extension builder in Walthamstow. 2nwest Builders and Decorators Ltd is a friendly and reliable company based in...
Five Star Builder
Experienced extension builder ready to quote for your work. Five Star Builder is the best extension builder in Walthamstow. No obligation free quot...
Dakus Construction Ltd
Dakus Construction Ltd are here to help customers who need an Extension Builder in Walthamstow. We offer a competitive rate to complete all your ex...
Dragan Building Construction
Need to find an Extension Builder near you for all your extension buildering work?
Dragan Building Construction provides a local, trusted e...
Cheapest builders for loft conversion in Walthamstow
Comparing extension builders estimates for Loft conversion gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost of a loft conversion in Walthamstow by posting your job to extension builders in Walthamstow.
"Loft conversion" - E17, job posted 01/01/70
"Loft conversion Double storey extension" - E18, job posted 08/09/25
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Estimates for common extension builder jobs in Walthamstow;
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 - £17,771
Two storey extension - £88,407
Build a timber frame extension - £26,271
Build a swimming pool - £81,271
Single storey extension - £60,424
Side return extension - £44,551
Install an RSJ - £2,471
Outbuilding - £10,271
Build a Mansard loft conversion - £52,271
Loft conversion - £36,293
Build a kitchen extension - £42,271
Hip to gable loft conversion - £42,271
Granny annexe - £87,271
Garden office - £10,271
Convert a Garage - £16,271
Garage - £18,771
Build a flat roof extension - £22,271
Build a dormer loft conversion - £42,271
Concrete foundations - £6,521
Convert a bungalow loft - £29,271
Convert a basement - £40,551