St Austell is one of Cornwall's largest towns, and its story is tied closely to china clay. The landscape around it, the granite in its older buildings and even the ground beneath many homes have been shaped by centuries of mining and clay working. If you're planning an extension, renovation or new build in or around St Austell, it helps to understand a few local factors before you settle on a design. This guide walks through them.
The kinds of homes in St Austell
St Austell has a broad mix of housing, which means projects vary a lot from street to street:
Victorian and Edwardian terraces near the town centre, often stone-built with slate roofs and small rear yards.
Granite and stone cottages in the older parts of the town and in the clay villages, many with solid walls that need breathable materials.
Post-war houses, estates and bungalows, which make up a large share of the town and are often well suited to extensions, loft conversions and remodelling.
Newer developments on the edges of the town, where planning conditions sometimes restrict what can be added without permission.
The construction of your home affects everything from insulation choices to structural design, so it's worth confirming early on.
Mining, clay works and ground conditions
Much of Cornwall has a history of metal mining, and the St Austell area also has extensive china clay workings. For building work this can matter in a few ways:
Mining searches are common when buying or developing property in Cornwall, to check for recorded shafts, workings or other features. If you're planning a new build or a large extension, it's sensible to look at the search results again with your designer.
Ground investigation may be recommended where there's made ground, old workings nearby or uncertain soil conditions. This helps the engineer design suitable foundations.
Foundation design can change as a result, for example deeper footings or a different foundation type. Our page on groundworks and foundations and our groundworks guide explain the options.
None of this means building in St Austell is unusually difficult. It simply means a bit of homework at the start avoids costly changes once the digger is on site.
Charlestown and protected areas
Charlestown, with its Georgian harbour, is part of the Cornwall and West Devon Mining Landscape World Heritage Site and has its own conservation area. Other parts of the St Austell area include conservation areas and listed buildings, and some of the coast is within a National Landscape (formerly an Area of Outstanding Natural Beauty). In these places, Cornwall Council is likely to look closely at design, scale and materials, and permitted development rights may be reduced. Our guides to planning permission in Cornwall and building in an AONB or conservation area explain what to expect.
Getting more from bungalows and post-war homes
Many St Austell homeowners have a bungalow or mid-century house and want more space without moving. Common options include:
Rear or side extensions to create open-plan kitchen and living areas. See our home extensions page.
Loft conversions, including dormers, to add bedrooms and bathrooms. See our loft conversions page.
Full renovations that update layouts, insulation, heating and finishes. See our property renovations page.
Older post-war homes can also benefit from energy upgrades during building work, such as improved insulation and airtightness. Our sustainable building page has more on this.
Weather and exposure
Homes on the higher ground around the clay country can be exposed to wind and rain, while properties around St Austell Bay, Par and Carlyon Bay face coastal weather. Well-chosen renders, roofing details and windows all help new work last. Our article on weatherproofing coastal homes has practical advice.
St Austell villages we cover
As well as the town itself, we work in the surrounding area, including Charlestown, Par, Tywardreath, Mevagissey, Pentewan, Polgooth, St Blazey and the clay villages such as Roche, Bugle, Stenalees, St Dennis and Nanpean. Rural plots in these areas often suit new builds, barn conversions and garden buildings.
Building in St Austell FAQs
Do I need a mining search before extending my St Austell home?
It isn't always required for a small extension, but if you already have a search from your purchase, it's worth sharing with your designer. For new builds and larger projects, a search and possibly a ground investigation are sensible.
Can I add a storey to my bungalow?
Sometimes. It depends on the structure, foundations and planning position. Some homes can use permitted development with prior approval, but this doesn't apply in every case, including in conservation areas and National Landscapes.
How long does a typical extension take?
It varies with the size and complexity of the project, but planning, design and approvals often take longer than the build itself, so it pays to start the process early.
Talk to us about your St Austell project
Cornish Building Company works throughout St Austell and the surrounding villages. Visit our builders in St Austell page, call us on 01208 816991, or contact us to discuss your plans.
