Adelphi Design & Construction Ltd is an established and experienced local extension builder in Johnstone. Please contact us for a free, no obligati...
Need an Extension Builder in Johnstone? Gman-Joinery & Builders has been helping local clients (20 mile radius) with their extension buildering job...
Experienced extension builder ready to quote for your work. Glencroft Builders Ltd is the best extension builder in Johnstone. No obligation free q...
LOCHNAGAR CONSTRUCTION LTD is a trusted extension builder serving customers in Johnstone and the surrounding area. Contact us to today to get a com...
Johnstone, PA5
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
LAKE BUILDERS LTD is an established extension buildering business in Johnstone. We come highly recommended and provide competitive quotes for your ...
From £22,184
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,080
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Abbey Services (Scotland) Ltd is a trusted extension builder serving customers in Johnstone and the surrounding area. Contact us to today to get a ...
"Great and reliable service, honest advice and competitive on price" - GLASGOW,reviewed 03/08/17, DAVID SMITH
From £22,312
Passionate about creating special, unique property renovations.

A flat roof extension ranges from the cheapest of £21,376 (Glencroft Builders Ltd based in G81) to the dearest of £22,312 (KFM Developments LTD based in G52), 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 Johnstone by posting a job with HaMuch. We'll send it to extension builders in Johnstone.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Johnstone | £52 | £381 |
| Build A Flat Roof Extension near Renfrewshire | £54 | £398 |
| Build A Flat Roof Extension near Paisley | £34 | £259 |
| Build A Flat Roof Extension near Barrhead | £35 | £255 |
| Build A Flat Roof Extension near Erskine | £34 | £258 |
| Build A Flat Roof Extension near Renfrew | £35 | £264 |
| Build A Flat Roof Extension near Clydebank | £35 | £265 |
| Build A Flat Roof Extension near Newton Mearns | £35 | £263 |
| Build A Flat Roof Extension near Giffnock | £35 | £260 |
| Build A Flat Roof Extension near Dumbarton | £29 | £232 |
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 - £17,610

Two storey extension - £88,166

Build a timber frame extension - £26,110

Build a swimming pool - £81,110

Single storey extension - £57,208

Side return extension - £42,742

Install an RSJ - £2,310

Outbuilding - £10,110

Build a Mansard loft conversion - £52,110

Loft conversion - £34,785

Build a kitchen extension - £42,110

Hip to gable loft conversion - £42,110

Granny annexe - £87,110

Garden office - £10,110

Convert a Garage - £16,110

Garage - £18,610

Build a flat roof extension - £22,110

Build a dormer loft conversion - £42,110

Concrete foundations - £6,360

Convert a bungalow loft - £29,110

Convert a basement - £38,742