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Lee Townsend
Need to find an Extension Builder near you for all your extension buildering work?
Lp Townsend Brickwork provides a local, trusted extensio...
Need an Extension Builder in Denham? Ava Constructions & Decors Ltd has been helping local clients (10 mile radius) with their extension buildering...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Bill Matharu
Matharu Buildings is an established extension buildering business in Denham. We come highly recommended and provide competitive quotes for your wor...
J Wijayamohan
JJSR Construction Ltd is an established and experienced local extension builder in Denham. Please contact us for a free, no obligation quote and co...
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 is an established and experienced local extension builder in Denham. Please contact us for a free, no obligation quote and compe...
Mario Prajar Building Services is an established and experienced local extension builder in Denham. Please contact us for a free, no obligation quo...
Need to find an Extension Builder near you for all your extension buildering work?
MAX CONSTRUCTION LTD provides a local, trusted extension...
RLC Construction are here to help customers who need an Extension Builder in Denham. We offer a competitive rate to complete all your extension bui...

A flat roof extension ranges from the cheapest of £21,880 (MAX CONSTRUCTION LTD based in HA4) 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 Denham by posting a job with HaMuch. We'll send it to extension builders in Denham.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Hillingdon | £43 | £276 |
| Build A Flat Roof Extension near Gerrards Cross | £43 | £283 |
| Build A Flat Roof Extension near Rickmansworth | £43 | £282 |
| Build A Flat Roof Extension near Watford | £43 | £280 |
| Build A Flat Roof Extension near Harrow | £43 | £270 |
| Build A Flat Roof Extension near Slough | £42 | £272 |
| Build A Flat Roof Extension near Bushey | £43 | £278 |
| Build A Flat Roof Extension near Windsor & Maidenhead | £42 | £272 |
| Build A Flat Roof Extension near Windsor | £41 | £271 |
| Build A Flat Roof Extension near Ealing | £44 | £275 |
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 - £17,627

Two storey extension - £88,191

Build a timber frame extension - £26,127

Build a swimming pool - £81,127

Single storey extension - £57,544

Side return extension - £42,931

Install an RSJ - £2,327

Outbuilding - £10,127

Build a Mansard loft conversion - £52,127

Loft conversion - £34,943

Build a kitchen extension - £42,127

Hip to gable loft conversion - £42,127

Granny annexe - £87,127

Garden office - £10,127

Convert a Garage - £16,127

Garage - £18,627

Build a flat roof extension - £22,127

Build a dormer loft conversion - £42,127

Concrete foundations - £6,377

Convert a bungalow loft - £29,127

Convert a basement - £38,931