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Experienced extension builder ready to quote for your work. Glencroft Builders Ltd is the best extension builder in Dumbarton. No obligation free q...
LOCHNAGAR CONSTRUCTION LTD is a trusted extension builder serving customers in Dumbarton and the surrounding area. Contact us to today to get a com...
DRUMKINNON JOINERY & BUILDING is a trusted extension builder serving customers in Dumbarton and the surrounding area. Contact us to today to get a ...
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 Dumbarton. Experienced in all extension buildering work and keeping within budget and on quote. CR Jo...

Building a granny annexe ranges from £86,376 (Glencroft Builders Ltd based in G81) to £87,288 (GH BUILDING SERVICES LTD based in PA14), 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 Dumbarton by posting a job with HaMuch. We will send it to extension builders in Dumbarton who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Dumbarton | £29 | £232 |
| Granny Annexe near Greenock | £30 | £243 |
| Granny Annexe near Port Glasgow | £32 | £250 |
| Granny Annexe near Erskine | £34 | £258 |
| Granny Annexe near Clydebank | £35 | £265 |
| Granny Annexe near Renfrewshire | £35 | £278 |
| Granny Annexe near Renfrew | £35 | £264 |
| Granny Annexe near Johnstone | £35 | £276 |
| 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 - £17,428

Two storey extension - £87,892

Build a timber frame extension - £25,928

Build a swimming pool - £80,928

Single storey extension - £53,560

Side return extension - £40,690

Install an RSJ - £2,128

Outbuilding - £9,928

Build a Mansard loft conversion - £51,928

Loft conversion - £33,075

Build a kitchen extension - £41,928

Hip to gable loft conversion - £41,928

Granny annexe - £86,928

Garden office - £9,928

Convert a Garage - £15,928

Garage - £18,428

Build a flat roof extension - £21,928

Build a dormer loft conversion - £41,928

Concrete foundations - £6,178

Convert a bungalow loft - £28,928

Convert a basement - £36,690