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TR1 Construction Ltd is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles around St Ag...
Dave Paull
At peninsula refurbishment we provide a service from start to finish with minimal hassle for the customer. The workmanship is always high priority,...
Trusted and professional extension builder in St Agnes. Experienced in all extension buildering work and keeping within budget and on quote. D & S ...
Experienced extension builder ready to quote for your work. KEAST CONSTRUCTION LTD is the best extension builder in St Agnes. No obligation free qu...
From £86,632
J C MITCHELL BUILDERS LTD is a trusted extension builder serving customers in St Agnes and the surrounding area. Contact us to today to get a compe...
From £86,784
Need to find an Extension Builder near you for all your extension buildering work?
KPK Builders Ltd provides a local, trusted extension bui...
From £86,704
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,704
From start to finish, your project will be undertaken by one of the family, providing the utmost care and quality of workmanship. We’ll work with...
From £86,816
Rock Construction is a trusted extension builder serving customers in St Agnes and the surrounding area. Contact us to today to get a competitive q...
From £86,672
A Collins Building Contractor is a trusted extension builder serving customers in St Agnes and the surrounding area. Contact us to today to get a c...

Building a granny annexe ranges from £86,528 (D & S Builders based in TR15) to £86,904 (Peninsula Property Refurbishments based in TR15), 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 St Agnes by posting a job with HaMuch. We will send it to extension builders in St Agnes who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Truro | £31 | £206 |
| Granny Annexe near Camborne | £28 | £196 |
| Granny Annexe near Newquay | £32 | £230 |
| Granny Annexe near Falmouth | £33 | £220 |
| Granny Annexe near St Ives, Cornwall | £27 | £188 |
| Granny Annexe near St Austell | £38 | £245 |
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 - £17,185

Two storey extension - £87,527

Build a timber frame extension - £25,685

Build a swimming pool - £80,685

Single storey extension - £48,696

Side return extension - £37,954

Install an RSJ - £1,885

Outbuilding - £9,685

Build a Mansard loft conversion - £51,685

Loft conversion - £30,795

Build a kitchen extension - £41,685

Hip to gable loft conversion - £41,685

Granny annexe - £86,685

Garden office - £9,685

Convert a Garage - £15,685

Garage - £18,185

Build a flat roof extension - £21,685

Build a dormer loft conversion - £41,685

Concrete foundations - £5,935

Convert a bungalow loft - £28,685

Convert a basement - £33,954