From £87,160
Kenmure Joinery Services are here to help customers who need an Extension Builder in West Dunbartonshire. We offer a competitive rate to complete a...
From £87,080
Adelphi Design & Construction Ltd is an established and experienced local extension builder in West Dunbartonshire. Please contact us for a free, n...
From £87,296
Need an Extension Builder in West Dunbartonshire? Gman-Joinery & Builders has been helping local clients (20 mile radius) with their extension buil...
From £86,952
Relax... you have found a reliable extension builder in West Dunbartonshire. DS Builders is a friendly and reliable company based in West Dunbarton...
From £86,928
J & J Property Services is an established extension buildering business in West Dunbartonshire. We come highly recommended and provide competitive ...
From £86,808
Boyle Construction Glasgow Ltd is a trusted extension builder serving customers in West Dunbartonshire and the surrounding area. Contact us to toda...
From £86,856
Need to find an Extension Builder near you for all your extension buildering work?
Montgomery Wet Trades provides a local, trusted extensio...
From £87,016
Trusted and professional extension builder in West Dunbartonshire. Experienced in all extension buildering work and keeping within budget and on qu...
From £86,376
Experienced extension builder ready to quote for your work. Glencroft Builders Ltd is the best extension builder in West Dunbartonshire. No obligat...

Building a granny annexe ranges from £86,376 (Glencroft Builders Ltd based in G81) to £87,296 (Gman-Joinery & Builders based in G13), 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 West Dunbartonshire by posting a job with HaMuch. We will send it to extension builders in West Dunbartonshire who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Dumbarton | £29 | £232 |
| Granny Annexe near Erskine | £34 | £258 |
| Granny Annexe near Greenock | £30 | £243 |
| Granny Annexe near Port Glasgow | £32 | £250 |
| Granny Annexe near Clydebank | £35 | £264 |
| Granny Annexe near Renfrew | £35 | £263 |
| Granny Annexe near Renfrewshire | £54 | £398 |
| Granny Annexe near Bearsden | £34 | £263 |
| Granny Annexe near Johnstone | £52 | £381 |
| Granny Annexe near Paisley | £34 | £259 |
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 - £17,386

Two storey extension - £87,830

Build a timber frame extension - £25,886

Build a swimming pool - £80,886

Single storey extension - £52,728

Side return extension - £40,222

Install an RSJ - £2,086

Outbuilding - £9,886

Build a Mansard loft conversion - £51,886

Loft conversion - £32,685

Build a kitchen extension - £41,886

Hip to gable loft conversion - £41,886

Granny annexe - £86,886

Garden office - £9,886

Convert a Garage - £15,886

Garage - £18,386

Build a flat roof extension - £21,886

Build a dormer loft conversion - £41,886

Concrete foundations - £6,136

Convert a bungalow loft - £28,886

Convert a basement - £36,222