Need an Extension Builder in SG18? R&J Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering jobs f...
TCL BUILDING SOLUTIONS LTD are here to help customers who need an Extension Builder in SG18. We offer a competitive rate to complete all your exten...
From £22,168
Relax... you have found a reliable extension builder in SG18. Imogen Jack is a friendly and reliable company based in SG18 who consider no job as t...
From £22,136
Trusted and professional extension builder in SG18. Experienced in all extension buildering work and keeping within budget and on quote. J. WATSON ...

A flat roof extension ranges from the cheapest of £21,848 (R&J Building Services Ltd based in SG17) to the dearest of £22,192 (TCL BUILDING SOLUTIONS LTD based in SG18), 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 SG18 by posting a job with HaMuch. We'll send it to extension builders in SG18.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Biggleswade | £41 | £268 |
| Build A Flat Roof Extension near Letchworth | £44 | £283 |
| Build A Flat Roof Extension near North Hertfordshire | £44 | £283 |
| Build A Flat Roof Extension near Kempston | £44 | £273 |
| Build A Flat Roof Extension near South Bedfordshire | £45 | £278 |
| Build A Flat Roof Extension near Bedford | £45 | £278 |
| Build A Flat Roof Extension near Mid Bedfordshire | £42 | £276 |
| Build A Flat Roof Extension near Ampthill | £38 | £258 |
| Build A Flat Roof Extension near St Neots | £51 | £318 |
| Build A Flat Roof Extension near Hitchin | £43 | £283 |
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 - £17,586

Two storey extension - £88,129

Build a timber frame extension - £26,086

Build a swimming pool - £81,086

Single storey extension - £56,720

Side return extension - £42,468

Install an RSJ - £2,286

Outbuilding - £10,086

Build a Mansard loft conversion - £52,086

Loft conversion - £34,556

Build a kitchen extension - £42,086

Hip to gable loft conversion - £42,086

Granny annexe - £87,086

Garden office - £10,086

Convert a Garage - £16,086

Garage - £18,586

Build a flat roof extension - £22,086

Build a dormer loft conversion - £42,086

Concrete foundations - £6,336

Convert a bungalow loft - £29,086

Convert a basement - £38,468