From £10,088
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,104
We are a part of the award-winning Refresh Renovation franchise network.Whether you want a simple bathroom remodel, or a large double storey extens...
From £10,064
Probuild was set up as a platform to service clients with High End affordable quality Construction & project Management with solid advice & accurat...
From £10,104
Need an Extension Builder in St Austell? Paul Clarke Architectural Builders has been helping local clients (20 mile radius) with their extension bu...
From £9,840
Aston Construction Project Management is a trusted extension builder serving customers in St Austell and the surrounding area. Contact us to today ...
From £9,936
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...
From £9,824
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...
From £10,144
Relax... you have found a reliable extension builder in St Austell. Daniel Job Building & Roofing Contractor Ltd is a friendly and reliable company...
From £9,808
Need to find an Extension Builder near you for all your extension buildering work?
Pendragon Builders Ltd provides a local, trusted extensi...
From £9,960
Pendragon Builders is a Cornwall-based business with over 40 years of experience specializing in end-to-end building solutions. We specialise in e...

Garden offices range from the cheapest of £9,808 (Pendragon Builders Ltd based in PL26) to the dearest of £10,144 (Daniel Job Building & Roofing Contractor Ltd based in PL24), but these are only estimates.
The best way to compare costs is to get actual quotes.
Get rates and quotes to build a garden office in St Austell by posting a job with HaMuch. We'll send it to extension builders in St Austell.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near St Austell | £38 | £245 |
| Garden Office near Truro | £31 | £206 |
| Garden Office near Newquay | £32 | £230 |
| Garden Office near Falmouth | £33 | £220 |
| Garden Office near Camborne | £28 | £196 |
| Garden Office 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 - £17,487

Two storey extension - £87,981

Build a timber frame extension - £25,987

Build a swimming pool - £80,987

Single storey extension - £54,744

Side return extension - £41,356

Install an RSJ - £2,187

Outbuilding - £9,987

Build a Mansard loft conversion - £51,987

Loft conversion - £33,630

Build a kitchen extension - £41,987

Hip to gable loft conversion - £41,987

Granny annexe - £86,987

Garden office - £9,987

Convert a Garage - £15,987

Garage - £18,487

Build a flat roof extension - £21,987

Build a dormer loft conversion - £41,987

Concrete foundations - £6,237

Convert a bungalow loft - £28,987

Convert a basement - £37,356