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Select your affordable Castleton extension builder
Need to find an Extension Builder near you for all your extension buildering work?
Neil Massey Roofing Contractor provides a local, trusted...
Hraham Evans
Firestone Surfacing Ltd is a trusted extension builder serving customers in Castleton and the surrounding area. Contact us to today to get a compet...
From £87,400
Castleton, DT9
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,160
Need an Extension Builder in Castleton? Morris Concrete Designs has been helping local clients (20 mile radius) with their extension buildering job...

Building a granny annexe ranges from £86,856 (Firestone Surfacing Ltd based in BA21) to £88,096 (Neil Massey Roofing Contractor based in BA21), 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 Castleton by posting a job with HaMuch. We will send it to extension builders in Castleton who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Yeovil | £34 | £294 |
| Granny Annexe near South Somerset | £62 | £270 |
| Granny Annexe near Dorchester | £30 | £230 |
| Granny Annexe near Weymouth | £33 | £260 |
| Granny Annexe near Frome | £33 | £263 |
| Granny Annexe near Bridgwater | £30 | £236 |
| Granny Annexe near Taunton | £31 | £242 |
| Granny Annexe near Bath | £32 | £249 |
| Granny Annexe near Poole | £38 | £250 |
| Granny Annexe near Trowbridge | £34 | £266 |
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 - £17,878

Two storey extension - £88,567

Build a timber frame extension - £26,378

Build a swimming pool - £81,378

Single storey extension - £62,560

Side return extension - £45,753

Install an RSJ - £2,578

Outbuilding - £10,378

Build a Mansard loft conversion - £52,378

Loft conversion - £37,294

Build a kitchen extension - £42,378

Hip to gable loft conversion - £42,378

Granny annexe - £87,378

Garden office - £10,378

Convert a Garage - £16,378

Garage - £18,878

Build a flat roof extension - £22,378

Build a dormer loft conversion - £42,378

Concrete foundations - £6,628

Convert a bungalow loft - £29,378

Convert a basement - £41,753