DRUMKINNON JOINERY & BUILDING is a trusted extension builder serving customers in Helensburgh and the surrounding area. Contact us to today to get ...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,600
Craig Ross
Trusted and professional extension builder in Helensburgh. Experienced in all extension buildering work and keeping within budget and on quote. CR ...
From £87,112
Need to find an Extension Builder near you for all your extension buildering work?
Price It Cost Consultants Ltd provides a local, trusted ...
From £87,608
MARTIN POWER BUILDERS are here to help customers who need an Extension Builder in Helensburgh. We offer a competitive rate to complete all your ext...

Building a granny annexe ranges from £86,600 (CR Joiners based in G82) to £87,608 (MARTIN POWER BUILDERS based in PA16), 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 Helensburgh by posting a job with HaMuch. We will send it to extension builders in Helensburgh who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Port Glasgow | £32 | £250 |
| Granny Annexe near Greenock | £30 | £243 |
| Granny Annexe near Dumbarton | £29 | £232 |
| Granny Annexe near Erskine | £34 | £258 |
| Granny Annexe near Renfrewshire | £54 | £398 |
| Granny Annexe near Clydebank | £35 | £264 |
| Granny Annexe near Johnstone | £52 | £381 |
| Granny Annexe near Renfrew | £35 | £263 |
| Granny Annexe near Paisley | £34 | £259 |
| Granny Annexe 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 - £17,642

Two storey extension - £88,214

Build a timber frame extension - £26,142

Build a swimming pool - £81,142

Single storey extension - £57,848

Side return extension - £43,102

Install an RSJ - £2,342

Outbuilding - £10,142

Build a Mansard loft conversion - £52,142

Loft conversion - £35,085

Build a kitchen extension - £42,142

Hip to gable loft conversion - £42,142

Granny annexe - £87,142

Garden office - £10,142

Convert a Garage - £16,142

Garage - £18,642

Build a flat roof extension - £22,142

Build a dormer loft conversion - £42,142

Concrete foundations - £6,392

Convert a bungalow loft - £29,142

Convert a basement - £39,102