From £21,752
Need an Extension Builder in L1? ARGYLE BUILDING AND MAINTENANCE has been helping local clients (20 mile radius) with their extension buildering jo...
From £21,968
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,016
Art Henry's are here to help customers who need an Extension Builder in L1. We offer a competitive rate to complete all your extension buildering j...
From £21,792
J J Nuttall Specialist Roofing Ltd are here to help customers who need an Extension Builder in L1. We offer a competitive rate to complete all your...
From £21,800
Experienced extension builder ready to quote for your work. Oxygen Property Partners is the best extension builder in L1. No obligation free quote...
From £21,672
J.M.C Building Services is a trusted extension builder serving customers in L1 and the surrounding area. Contact us to today to get a competitive q...
From £21,816
DK Building is an established extension buildering business in L1. We come highly recommended and provide competitive quotes for your work.
From £21,904
Glassrooms is an established extension buildering business in L1. We come highly recommended and provide competitive quotes for your work.
From £21,872
Relax... you have found a reliable extension builder in L1. Britannia Builders is a friendly and reliable company based in L1 who consider no job a...
From £21,736
Trusted and professional extension builder in L1. Experienced in all extension buildering work and keeping within budget and on quote. MA Roofing &...

A flat roof extension ranges from the cheapest of £21,672 (J.M.C Building Services based in L4) to the dearest of £22,016 (Art Henry's based in L8), 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 L1 by posting a job with HaMuch. We'll send it to extension builders in L1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Liverpool | £31 | £222 |
| Build A Flat Roof Extension near Birkenhead | £31 | £219 |
| Build A Flat Roof Extension near Wallasey | £33 | £224 |
| Build A Flat Roof Extension near Bootle | £32 | £223 |
| Build A Flat Roof Extension near Bebington | £31 | £222 |
| Build A Flat Roof Extension near Wirral | £31 | £219 |
| Build A Flat Roof Extension near Crosby | £34 | £223 |
| Build A Flat Roof Extension near Kirkby | £31 | £222 |
| Build A Flat Roof Extension near Huyton with Roby | £31 | £225 |
| Build A Flat Roof Extension near Knowsley | £31 | £221 |
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 - £17,333

Two storey extension - £87,749

Build a timber frame extension - £25,833

Build a swimming pool - £80,833

Single storey extension - £51,656

Side return extension - £39,619

Install an RSJ - £2,033

Outbuilding - £9,833

Build a Mansard loft conversion - £51,833

Loft conversion - £32,183

Build a kitchen extension - £41,833

Hip to gable loft conversion - £41,833

Granny annexe - £86,833

Garden office - £9,833

Convert a Garage - £15,833

Garage - £18,333

Build a flat roof extension - £21,833

Build a dormer loft conversion - £41,833

Concrete foundations - £6,083

Convert a bungalow loft - £28,833

Convert a basement - £35,619