From £22,160
Kenmure Joinery Services are here to help customers who need an Extension Builder in Dumbarton. We offer a competitive rate to complete all your ex...
From £22,080
Adelphi Design & Construction Ltd is an established and experienced local extension builder in Dumbarton. Please contact us for a free, no obligati...
From £22,296
Need an Extension Builder in Dumbarton? Gman-Joinery & Builders has been helping local clients (20 mile radius) with their extension buildering job...
From £21,952
Relax... you have found a reliable extension builder in Dumbarton. DS Builders is a friendly and reliable company based in Dumbarton who consider n...
From £21,928
J & J Property Services is an established extension buildering business in Dumbarton. We come highly recommended and provide competitive quotes for...
From £21,808
Boyle Construction Glasgow Ltd is a trusted extension builder serving customers in Dumbarton and the surrounding area. Contact us to today to get a...
From £21,856
Need to find an Extension Builder near you for all your extension buildering work?
Montgomery Wet Trades provides a local, trusted extensio...
From £21,376
Experienced extension builder ready to quote for your work. Glencroft Builders Ltd is the best extension builder in Dumbarton. No obligation free q...
From £21,968
RADICAL CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in Dumbarton. We offer a competitive rate to complete all you...

A flat roof extension ranges from the cheapest of £21,376 (Glencroft Builders Ltd based in G81) to the dearest of £22,296 (Gman-Joinery & Builders based in G13), 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 Dumbarton by posting a job with HaMuch. We'll send it to extension builders in Dumbarton.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Dumbarton | £29 | £232 |
| Build A Flat Roof Extension near Greenock | £30 | £243 |
| Build A Flat Roof Extension near Port Glasgow | £32 | £250 |
| Build A Flat Roof Extension near Erskine | £34 | £258 |
| Build A Flat Roof Extension near Clydebank | £35 | £264 |
| Build A Flat Roof Extension near Renfrewshire | £54 | £398 |
| Build A Flat Roof Extension near Renfrew | £35 | £263 |
| Build A Flat Roof Extension near Johnstone | £52 | £381 |
| Build A Flat Roof Extension near Paisley | £34 | £259 |
| Build A Flat Roof Extension near Bearsden | £34 | £263 |
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 - £17,382

Two storey extension - £87,822

Build a timber frame extension - £25,882

Build a swimming pool - £80,882

Single storey extension - £52,632

Side return extension - £40,168

Install an RSJ - £2,082

Outbuilding - £9,882

Build a Mansard loft conversion - £51,882

Loft conversion - £32,640

Build a kitchen extension - £41,882

Hip to gable loft conversion - £41,882

Granny annexe - £86,882

Garden office - £9,882

Convert a Garage - £15,882

Garage - £18,382

Build a flat roof extension - £21,882

Build a dormer loft conversion - £41,882

Concrete foundations - £6,132

Convert a bungalow loft - £28,882

Convert a basement - £36,168