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Need an Extension Builder in Letchworth? R&J Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering ...
Experienced extension builder ready to quote for your work. HB Construction is the best extension builder in Letchworth. No obligation free quotes ...
Trusted and professional extension builder in Letchworth. Experienced in all extension buildering work and keeping within budget and on quote. Amce...
Letchworth, SG6
Need an Extension Builder in Letchworth? WILLMOTT DIXON CONSTRUCTION LI has been helping local clients (20 mile radius) with their extension builde...
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...
Gary Braine
Experienced extension builder ready to quote for your work. G B BUILDSTORE LTD is the best extension builder in Letchworth. No obligation free quot...
Letchworth, SG6
Need an Extension Builder in Letchworth? M SPINDLER CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension builderin...
TCL BUILDING SOLUTIONS LTD are here to help customers who need an Extension Builder in Letchworth. We offer a competitive rate to complete all your...
From £22,456
Steve Rolt Home Improvements Ltd was founded in 2016 in Buntingford, Hertfordshire, and from small beginnings, has gone from stren...
From £22,120
James Hogbourne
For more than 10 years, North Hertfordshire Construction LTD have been the name you can trust when it comes to building and development! We are kno...

A flat roof extension ranges from the cheapest of £21,848 (R&J Building Services Ltd based in SG17) to the dearest of £22,488 (M SPINDLER CONSTRUCTION LTD based in SG6), 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 Letchworth by posting a job with HaMuch. We'll send it to extension builders in Letchworth.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| 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 Hitchin | £43 | £283 |
| Build A Flat Roof Extension near Stevenage | £44 | £282 |
| Build A Flat Roof Extension near Biggleswade | £41 | £268 |
| Build A Flat Roof Extension near East Hertfordshire | £44 | £289 |
| Build A Flat Roof Extension near Mid Bedfordshire | £42 | £276 |
| Build A Flat Roof Extension near Luton | £42 | £279 |
| Build A Flat Roof Extension near Ampthill | £38 | £258 |
| Build A Flat Roof Extension near Harpenden | £45 | £282 |
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 - £17,705

Two storey extension - £88,307

Build a timber frame extension - £26,205

Build a swimming pool - £81,205

Single storey extension - £59,096

Side return extension - £43,804

Install an RSJ - £2,405

Outbuilding - £10,205

Build a Mansard loft conversion - £52,205

Loft conversion - £35,670

Build a kitchen extension - £42,205

Hip to gable loft conversion - £42,205

Granny annexe - £87,205

Garden office - £10,205

Convert a Garage - £16,205

Garage - £18,705

Build a flat roof extension - £22,205

Build a dormer loft conversion - £42,205

Concrete foundations - £6,455

Convert a bungalow loft - £29,205

Convert a basement - £39,804