Quality Construction and Renovation Experts

Welcome to Build Cornwall

Build Cornwall is a well-established construction and renovation company based in St Austell, proudly serving Mid Cornwall and its surrounding coastal areas. Over the years, we’ve built a strong reputation as one of the region’s leading construction firms, known for our commitment to exceptional workmanship and attention to detail. In partnership with trusted plumbing and electrical specialists, we offer a seamless, first-class contracting service - guiding each project from initial concept through to final completion.

Extensions & Renovations

Build Cornwall specialises in high-quality building extensions, expertly expanding your property to create more space tailored to your needs. We also deliver expert renovations that transform your property, enhancing its style, functionality, and value with quality craftsmanship.

New Builds

Build Cornwall provides professional new build services, creating bespoke homes designed to your needs with exceptional quality and precision. We deliver properties that reflect your vision, enhancing their style, functionality, and value with expert expertise.

Contact Form

Our skilled local team puts you first delivering quality workmanship with honesty care and professionalism

We communicate clearly at every stage offering honest advice and tailored solutions without the confusing jargon

We take pride in every project building with care integrity and attention to lasting quality and detail craftsmanship

We provide fair upfront quotes with no hidden fees offering real value for your investment

Don't just take our word for it - read our client testimonials.

"I’ve known James since moving to Cornwall, after he was recommended by a satisfied neighbour. He and his team have since completed various projects for us, including electrical work, plumbing, building, and general maintenance.
They’re always polite, professional, friendly, reliable, and good value for money. Jobs are done with care and attention to detail, and they always turn up on time, clean as they go, and communicate clearly about progress or any unexpected issues. We’ve built a great relationship with James, and he’s always our first call. I highly recommend Build Cornwall."
Julie, Carlyon Bay
"Having purchased a holiday cottage in Cornwall in need of renovation I started the search for a local builder. We live in Hertfordshire and the renovation would have to be completed by somebody I could trust as we would only be able to visit once a month at the most. I asked locally for names of contractors and was recommended a few including James Smithson of Build Cornwall. My wife and I felt at ease with James from our first meeting. He knew what he was talking about (as a retired professional I could sense this) and the price was right."
Mr & Mrs Sherwood
Build Cornwall has been dependable, skilful, enthusiastic and throughout realistically priced and I could not have asked for more. I initially engaged them to build a large rear extension and double garage and they did an excellent job, so much so that I retained them for additional contract work outside which once again was finished to an excellent standard. James and his team were at all times professional and courteous and at each stage of the project made sure that they left things clean and tidy. A real find".
Mr Daniels, St Austell.