From £21,720
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,784
Lancashire, BB1
Need to find an Extension Builder near you for all your extension buildering work?
D Parker Design & Build provides a local, trusted extens...
From £21,856
Lancashire, BB1
Need an Extension Builder in Lancashire? Smart building solutions Blackburn ltd has been helping local clients (20 mile radius) with their extensio...
From £21,712
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,624
WM Brickwork & Pointing are here to help customers who need an Extension Builder in Lancashire. We offer a competitive rate to complete all your ex...
From £21,928
M. Pickering Builder & Joiner is a trusted extension builder serving customers in Lancashire and the surrounding area. Contact us to today to get a...
From £21,736
Need to find an Extension Builder near you for all your extension buildering work?
East Lancs Construction Ltd provides a local, trusted ex...
From £21,816
BRYAN LEE BUILDING CONST LTD is an established and experienced local extension builder in Lancashire. Please contact us for a free, no obligation q...
From £21,728
Lonsdale Construction is a trusted extension builder serving customers in Lancashire and the surrounding area. Contact us to today to get a competi...
From £21,808
Need to find an Extension Builder near you for all your extension buildering work?
J. Grimshaw provides a local, trusted extension builderi...

A flat roof extension ranges from the cheapest of £21,624 (WM Brickwork & Pointing based in BB1) to the dearest of £21,928 (M. Pickering Builder & Joiner based in BB2), 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 Lancashire by posting a job with HaMuch. We'll send it to extension builders in Lancashire.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Blackburn | £33 | £246 |
| Build A Flat Roof Extension near Accrington | £33 | £243 |
| Build A Flat Roof Extension near Darwen | £34 | £253 |
| Build A Flat Roof Extension near Rawtenstall | £29 | £213 |
| Build A Flat Roof Extension near Bamber Bridge | £30 | £216 |
| Build A Flat Roof Extension near Chorley | £30 | £221 |
| Build A Flat Roof Extension near Burnley | £29 | £219 |
| Build A Flat Roof Extension near Preston | £30 | £218 |
| Build A Flat Roof Extension near Leyland | £30 | £223 |
| Build A Flat Roof Extension near Fulwood | £31 | £217 |
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 - £17,271

Two storey extension - £87,657

Build a timber frame extension - £25,771

Build a swimming pool - £80,771

Single storey extension - £50,424

Side return extension - £38,926

Install an RSJ - £1,971

Outbuilding - £9,771

Build a Mansard loft conversion - £51,771

Loft conversion - £31,605

Build a kitchen extension - £41,771

Hip to gable loft conversion - £41,771

Granny annexe - £86,771

Garden office - £9,771

Convert a Garage - £15,771

Garage - £18,271

Build a flat roof extension - £21,771

Build a dormer loft conversion - £41,771

Concrete foundations - £6,021

Convert a bungalow loft - £28,771

Convert a basement - £34,926