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AV Home Improvements
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
Sharp Building Ltd
Sharp Building Ltd is an established and experienced local extension builder in Northwood. Please contact us for a free, no obligation quote and co...
Building Service and Support Ltd
Relax... you have found a reliable extension builder in Northwood. Building Service and Support Ltd is a friendly and reliable company based in Nor...
C S C BUILDINGS LTD
Relax... you have found a reliable extension builder in Northwood. C S C BUILDINGS LTD is a friendly and reliable company based in Northwood who co...
Frame Brickwork
Relax... you have found a reliable extension builder in Northwood. Frame Brickwork is a friendly and reliable company based in Northwood who consid...
Timeless Interiors
Personable and individual interior design service designed around what you love.
Project Squared Construction Ltd
We specialise in constructing and the refurbishment of homes for discerning clients looking for quality, excellence and design in London and the Ho...
DeHavilland Design & Build Limited
DeHavilland Design and Build have more than 12 years of experience working on major refurbishments, extensions and renovations in Central & West Lo...
J B S Development & Construction Ltd
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Adams Build and Design LTD.
Northwood Greater London, HA6
Need to find an Extension Builder near you for all your extension buildering work?
Adams Build and Design LTD. provides a local, trusted ex...
Flat roof extension cost in Northwood
A flat roof extension ranges from the cheapest of £21,960 (J B S Development & Construction Ltd based in HA5) to the dearest of £22,464 (AV Home Improvements based in WD19), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Northwood by posting a job with HaMuch. We'll send it to extension builders in Northwood.
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Estimates for common extension builder jobs in Northwood;
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 - £17,774
Two storey extension - £88,412
Build a timber frame extension - £26,274
Build a swimming pool - £81,274
Single storey extension - £60,488
Side return extension - £44,587
Install an RSJ - £2,474
Outbuilding - £10,274
Build a Mansard loft conversion - £52,274
Loft conversion - £36,323
Build a kitchen extension - £42,274
Hip to gable loft conversion - £42,274
Granny annexe - £87,274
Garden office - £10,274
Convert a Garage - £16,274
Garage - £18,774
Build a flat roof extension - £22,274
Build a dormer loft conversion - £42,274
Concrete foundations - £6,524
Convert a bungalow loft - £29,274
Convert a basement - £40,587