From £22,536
Are you looking for resin driveways in North London? We are a leading builder of driveways and patios in North London. We have expertise in various...
From £22,216
Ebro Construction Group are here to help customers who need an Extension Builder in AL4. We offer a competitive rate to complete all your extension...
From £22,528
Billy Homan set up Grain Property to provide high-quality design, seamless project delivery, and a commitment to excellent communication throughout...
From £22,232
Buyerz Trading is an established and experienced local extension builder in AL4. Please contact us for a free, no obligation quote and competitive ...
From £22,024
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...
From £21,984
Abalon is Western Canada’s leading foundation repair and basement waterproofing company, operating in the Edmonton area for over 40 years (50 yea...
From £22,480
Building services company Renospace was established in 2000. Since then we have been helping customers in Hertfordshire and the surrounding area by...
From £22,072
A1 Home Care Building Maintenance are here to help customers who need an Extension Builder in AL4. We offer a competitive rate to complete all your...
From £22,216
VALLEYCREST CONSTRUCTION LTD is a trusted extension builder serving customers in AL4 and the surrounding area. Contact us to today to get a competi...

A flat roof extension ranges from the cheapest of £21,984 (Abalon Construction based in ZZ99) to the dearest of £22,536 (R. Newman Construction based in AL4), 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 AL4 by posting a job with HaMuch. We'll send it to extension builders in AL4.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near St Albans | £63 | £288 |
| Build A Flat Roof Extension near Hatfield | £64 | £283 |
| Build A Flat Roof Extension near Harpenden | £86 | £315 |
| Build A Flat Roof Extension near Welwyn Garden City | £42 | £268 |
| Build A Flat Roof Extension near Potters Bar | £43 | £273 |
| Build A Flat Roof Extension near Borehamwood | £42 | £270 |
| Build A Flat Roof Extension near Hemel Hempstead | £42 | £270 |
| Build A Flat Roof Extension near Dacorum | £42 | £269 |
| Build A Flat Roof Extension near Bushey | £42 | £276 |
| Build A Flat Roof Extension near Hertford | £46 | £289 |
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 - £17,731

Two storey extension - £88,347

Build a timber frame extension - £26,231

Build a swimming pool - £81,231

Single storey extension - £59,624

Side return extension - £44,101

Install an RSJ - £2,431

Outbuilding - £10,231

Build a Mansard loft conversion - £52,231

Loft conversion - £35,918

Build a kitchen extension - £42,231

Hip to gable loft conversion - £42,231

Granny annexe - £87,231

Garden office - £10,231

Convert a Garage - £16,231

Garage - £18,731

Build a flat roof extension - £22,231

Build a dormer loft conversion - £42,231

Concrete foundations - £6,481

Convert a bungalow loft - £29,231

Convert a basement - £40,101