From £22,408
Laurdan Building LTD is an established and experienced local extension builder in AL6. Please contact us for a free, no obligation quote and compet...
From £21,920
Need an Extension Builder in AL6? MA Gower has been helping local clients (20 mile radius) with their extension buildering jobs for many years. Get...
From £21,960
Relax... you have found a reliable extension builder in AL6. Interior Installations is a friendly and reliable company based in AL6 who consider no...
From £21,320
Complex Construction is an established extension buildering business in AL6. We come highly recommended and provide competitive quotes for your wor...
From £22,400
J&R Property is an established and experienced local extension builder in AL6. Please contact us for a free, no obligation quote and competitive ra...
From £21,944
Ross Taylor Homes is an established extension buildering business in AL6. We come highly recommended and provide competitive quotes for your work.<...
From £22,424
Wiemy jak wa?n? decyzj? dla naszych Klientów jest budowa kupno czy remont domu, dlatego stawiamy na nowoczesne i ekonomiczne rozwi?zania , a ca?? ...
From £22,480
We offer an extensive building service including a turnkey solution. We are experts in residential extensions, alterations and new builds in the He...
From £22,168
LBH Building & Property Services are here to help customers who need an Extension Builder in AL6. We offer a competitive rate to complete all your ...
From £21,944
STYLE BUILDING SERVICES LTD are here to help customers who need an Extension Builder in AL6. We offer a competitive rate to complete all your exten...

A flat roof extension ranges from the cheapest of £21,320 (Complex Construction based in AL7) to the dearest of £22,480 (Herts Premier Builders based in AL7), 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 AL6 by posting a job with HaMuch. We'll send it to extension builders in AL6.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Welwyn Garden City | £42 | £268 |
| Build A Flat Roof Extension near Hertford | £46 | £289 |
| Build A Flat Roof Extension near Hatfield | £64 | £283 |
| Build A Flat Roof Extension near Stevenage | £44 | £282 |
| Build A Flat Roof Extension near Harpenden | £86 | £315 |
| Build A Flat Roof Extension near Hitchin | £43 | £283 |
| Build A Flat Roof Extension near East Hertfordshire | £44 | £289 |
| Build A Flat Roof Extension near Ware | £47 | £296 |
| Build A Flat Roof Extension near St Albans | £63 | £288 |
| Build A Flat Roof Extension near North Hertfordshire | £44 | £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 - £17,597

Two storey extension - £88,145

Build a timber frame extension - £26,097

Build a swimming pool - £81,097

Single storey extension - £56,936

Side return extension - £42,589

Install an RSJ - £2,297

Outbuilding - £10,097

Build a Mansard loft conversion - £52,097

Loft conversion - £34,658

Build a kitchen extension - £42,097

Hip to gable loft conversion - £42,097

Granny annexe - £87,097

Garden office - £10,097

Convert a Garage - £16,097

Garage - £18,597

Build a flat roof extension - £22,097

Build a dormer loft conversion - £42,097

Concrete foundations - £6,347

Convert a bungalow loft - £29,097

Convert a basement - £38,589