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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...
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 £10,088
Need an Extension Builder in St Austell? DAVEY CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering job...
From £9,784
HAM & PEARCE CONSTRUCTION LTD is a trusted extension builder serving customers in St Austell and the surrounding area. Contact us to today to get a...
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 £9,808
Need to find an Extension Builder near you for all your extension buildering work?
Pendragon Builders Ltd provides a local, trusted extensi...

Garden offices range from the cheapest of £9,784 (HAM & PEARCE CONSTRUCTION LTD based in PL23) to the dearest of £10,104 (Refresh Renovations Cornwall based in PL25), 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 - £17,464

Two storey extension - £87,946

Build a timber frame extension - £25,964

Build a swimming pool - £80,964

Single storey extension - £54,280

Side return extension - £41,095

Install an RSJ - £2,164

Outbuilding - £9,964

Build a Mansard loft conversion - £51,964

Loft conversion - £33,413

Build a kitchen extension - £41,964

Hip to gable loft conversion - £41,964

Granny annexe - £86,964

Garden office - £9,964

Convert a Garage - £15,964

Garage - £18,464

Build a flat roof extension - £21,964

Build a dormer loft conversion - £41,964

Concrete foundations - £6,214

Convert a bungalow loft - £28,964

Convert a basement - £37,095