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Peter Rourke
Harpenden, AL5
Trusted and professional extension builder in Harpenden. Experienced in all extension buildering work and keeping within budget and on quote. Peter...
Elena nuta Radu
Plumbing, painting exterior, interior, extensions, plastering, skiming, carpeting, Flooring, you can ask us ..
Need to find an Extension Builder near you for all your extension buildering work?
Greg-Bud provides a local, trusted extension buildering ...
Top Notch Tradesmen is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and c...
A.J Builders is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and competit...
Amarjeet Gill
Architecture and Construction all in one place.
FREE DRAWINGS for all projects we build.
Buyerz Trading is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and compet...
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...
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
A1 Home Care Building Maintenance are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete al...

A flat roof extension ranges from the cheapest of £21,936 (Bacan's cleaning painting and decorating based in LU1) 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 Harpenden by posting a job with HaMuch. We'll send it to extension builders in Harpenden.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Harpenden | £45 | £282 |
| Build A Flat Roof Extension near St Albans | £43 | £272 |
| Build A Flat Roof Extension near Luton | £42 | £279 |
| Build A Flat Roof Extension near Hatfield | £42 | £266 |
| Build A Flat Roof Extension near Hemel Hempstead | £43 | £276 |
| Build A Flat Roof Extension near Welwyn Garden City | £42 | £269 |
| Build A Flat Roof Extension near Dacorum | £42 | £275 |
| Build A Flat Roof Extension near Hitchin | £43 | £283 |
| Build A Flat Roof Extension near Dunstable | £41 | £274 |
| Build A Flat Roof Extension near Stevenage | £44 | £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 - £17,760

Two storey extension - £88,390

Build a timber frame extension - £26,260

Build a swimming pool - £81,260

Single storey extension - £60,200

Side return extension - £44,425

Install an RSJ - £2,460

Outbuilding - £10,260

Build a Mansard loft conversion - £52,260

Loft conversion - £36,188

Build a kitchen extension - £42,260

Hip to gable loft conversion - £42,260

Granny annexe - £87,260

Garden office - £10,260

Convert a Garage - £16,260

Garage - £18,760

Build a flat roof extension - £22,260

Build a dormer loft conversion - £42,260

Concrete foundations - £6,510

Convert a bungalow loft - £29,260

Convert a basement - £40,425