House Extensions & Renovations in Cornwall

A1 Complete Builders builds house extensions and carries out home renovations across Cornwall, including the Truro area. Based in Higher Fraddon and established in 2000, our family-run company helps homeowners create more living space and improve existing properties.

Our projects include kitchen extensions, orangeries, garden room annexes and two-storey extensions. Whether you need space for a growing family, a home office or a wider refurbishment, we work with you and your architect to understand the project and coordinate the build.

The Orangery

Recent projects feature the striking Orangery Kitchen Extension in Perranuthnoe (2023), melding hardwood orangery design with bespoke kitchen spaces. We also completed a serene Garden Room Annexe in Trevissome (2022), ideal for peaceful work or leisure environments. Upstairs, the Goonvean Farm extension on The Lizard saw the addition of a first-floor bedroom and twin dormers, finished with powder-coated aluminium windows and cedar cladding, showcasing our knack for combining modern style with traditional charm.

Recent Projects

Modern house exterior with large glass doors opening onto a wooden deck surrounded by greenery.

Polventon Polventon

Laundry Cottage

Gable End Rebuild Blue Anchor, Fraddon

Damp/Mouldy Walls

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From your first enquiry to final completion, we provide a fully managed service tailored to your needs. We begin with an in-depth consultation to understand your goals, site conditions, and budget. Our experienced team can then support you through planning applications, building regulations, and structural considerations, offering clear advice at every step.

Design is a collaborative process. We work closely with clients and architects to develop practical, attractive solutions that suit your lifestyle and enhance your property’s value. Whether you need extra living space, a home office, or multigenerational accommodation, we’ll help turn your ideas into a workable, high-quality plan.

Renovating an older property? Our building conservation and restoration team can help with heritage work, while our lime and cob specialists handle traditional wall repairs and finishes.

Request a quote for your extension or renovation

Tell us where your property is, what you would like to change and whether you have drawings or approvals in place. Use the form or call 01726 883388 to discuss your extension or renovation in Cornwall.

Once the design is approved, we coordinate the building work, from groundwork and structural alterations through to roofing, insulation, electrics and finishing, keeping you informed throughout.