From £21,896
Need an Extension Builder in Denham? Total Services has been helping local clients (10 mile radius) with their extension buildering jobs for many y...
From £22,400
Middlesex, UB9
Asset Lofts is an established extension buildering business in Denham. We come highly recommended and provide competitive quotes for your work.
...From £22,064
Sokhi Construction (UK) Ltd is a trusted extension builder serving customers in Denham and the surrounding area. Contact us to today to get a compe...
From £22,208
P&s Contractors are a family run business that carry out all types of roofing works. We have been working in the roofing industry for the past 29 y...
From £22,392
Sheppard Construction Ltd is a trusted extension builder serving customers in Denham and the surrounding area. Contact us to today to get a competi...
From £22,016
DeHavilland Design & Build Limited is an established extension buildering business in Denham. We come highly recommended and provide competitive qu...
From £22,344
DeHavilland Design and Build have more than 12 years of experience working on major refurbishments, extensions and renovations in Central & West Lo...
From £22,072
At CC Builders UK Development, we offer solutions for all aspects of construction for both domestic and commercial clients throughout London and th...
From £22,264
Relax... you have found a reliable extension builder in Denham. The Property Planner is a friendly and reliable company based in Denham who conside...
From £22,360
Welcome to Homeworks Roofing Services, we work on roof tops of private homes and listed buildings across Middlesex, West London and Ruislip.

A flat roof extension ranges from the cheapest of £21,896 (Total Services based in UB9) to the dearest of £22,400 (Asset Lofts based in UB9), 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 | £63 | £276 |
| Build A Flat Roof Extension near Gerrards Cross | £43 | £282 |
| Build A Flat Roof Extension near Rickmansworth | £42 | £278 |
| Build A Flat Roof Extension near Watford | £43 | £278 |
| Build A Flat Roof Extension near Harrow | £43 | £271 |
| Build A Flat Roof Extension near Slough | £42 | £272 |
| Build A Flat Roof Extension near Bushey | £42 | £276 |
| 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 - £17,702

Two storey extension - £88,302

Build a timber frame extension - £26,202

Build a swimming pool - £81,202

Single storey extension - £59,032

Side return extension - £43,768

Install an RSJ - £2,402

Outbuilding - £10,202

Build a Mansard loft conversion - £52,202

Loft conversion - £35,640

Build a kitchen extension - £42,202

Hip to gable loft conversion - £42,202

Granny annexe - £87,202

Garden office - £10,202

Convert a Garage - £16,202

Garage - £18,702

Build a flat roof extension - £22,202

Build a dormer loft conversion - £42,202

Concrete foundations - £6,452

Convert a bungalow loft - £29,202

Convert a basement - £39,768