Relax... you have found a reliable extension builder in St Austell. BUILDMARK BUILDERS is a friendly and reliable company based in St Austell who c...
Trusted and professional extension builder in St Austell. Experienced in all extension buildering work and keeping within budget and on quote. Bush...
We are a construction company that have been providing professional high quality work for 25 years.
We work mainly with listed and period...
"I would recommend Sean, he did a great job on my barn conversion." - BODMIN,reviewed 13/11/20, TREVOR JONES
M D A BUILDERS is an established extension buildering business in St Austell. We come highly recommended and provide competitive quotes for your w...
SANDSTONE BUILDERS T/A is a trusted extension builder serving customers in St Austell and the surrounding area. Contact us to today to get a compet...
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 Au...
Experienced in extensions, renovations, home improvements, patios, fencing, landscaping, carpentry, plastering and general property maintenance. Ex...
Experienced extension builder ready to quote for your work. KEAST CONSTRUCTION LTD is the best extension builder in St Austell. No obligation free ...
Elements Build SW Ltd is an established and experienced local extension builder in St Austell. Please contact us for a free, no obligation quote an...
Our building services company MS Builders (South West) Ltd has over 17 years’ experience in the industry. We have been helping customers in Liske...

Building a granny annexe ranges from £86,544 (KEAST CONSTRUCTION LTD based in TR1) to £87,184 (MS Builders (South West) Ltd based in PL14), 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 Austell by posting a job with HaMuch. We will send it to extension builders in St Austell who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near St Austell | £38 | £245 |
| Granny Annexe near Truro | £31 | £206 |
| Granny Annexe near Newquay | £32 | £230 |
| Granny Annexe near Falmouth | £33 | £220 |
| Granny Annexe near Camborne | £28 | £196 |
| Granny Annexe near Plymouth | £30 | £230 |
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 - £17,400

Two storey extension - £87,850

Build a timber frame extension - £25,900

Build a swimming pool - £80,900

Single storey extension - £53,000

Side return extension - £40,375

Install an RSJ - £2,100

Outbuilding - £9,900

Build a Mansard loft conversion - £51,900

Loft conversion - £32,813

Build a kitchen extension - £41,900

Hip to gable loft conversion - £41,900

Granny annexe - £86,900

Garden office - £9,900

Convert a Garage - £15,900

Garage - £18,400

Build a flat roof extension - £21,900

Build a dormer loft conversion - £41,900

Concrete foundations - £6,150

Convert a bungalow loft - £28,900

Convert a basement - £36,375