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 £87,184
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,080
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 £87,312
Passionate about creating special, unique property renovations.

Building a granny annexe ranges from £86,376 (Glencroft Builders Ltd based in G81) to £87,312 (KFM Developments LTD based in G52), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in Johnstone by posting a job with HaMuch. We will send it to extension builders in Johnstone who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Johnstone | £52 | £381 |
| Granny Annexe near Renfrewshire | £54 | £398 |
| Granny Annexe near Paisley | £34 | £259 |
| Granny Annexe near Barrhead | £35 | £255 |
| Granny Annexe near Erskine | £34 | £258 |
| Granny Annexe near Renfrew | £35 | £264 |
| Granny Annexe near Clydebank | £35 | £265 |
| Granny Annexe near Newton Mearns | £35 | £263 |
| Granny Annexe near Giffnock | £35 | £260 |
| Granny Annexe 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