RESIDENTIAL BUILDER -
SURF COAST, BELLARINE & MOUNT BEAUTY
Built to
last a lifetime
RESIDENTIAL BUILDER - SURF COAST, BELLARINE & MOUNT BEAUTY
Custom homes and large-scale renovations, built by Keystone Construction for your comfort and sustainability
More than a builder
Keystone Construction and Design is a family-owned residential construction company that creates high-quality, custom homes that are built to last a lifetime.
We specialise in residential renovations and new builds along the Surf Coast, Bellarine Peninsula and Alpine regions, including Mount Beauty and surrounds. Our builds reflect a deep understanding of sustainable practices, complex design needs, and the demands of local environments.
We’re committed to delivering bespoke outcomes that are architecturally aligned, environmentally conscious, and tailored to our clients’ long-term needs.
"Keystone Construction & Design provided exceptional service throughout our renovation project. Their attention to detail and commitment to sustainability were evident in every aspect of their work."
Tom P.
RENOVATION, GROVEDALE
How we can help
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We specialise in sustainable solar passive homes designed to maximise natural light and minimise energy consumption. Our custom homes are constructed from locally sourced, energy-efficient materials including rammed earth, showcasing our commitment to eco-friendly design. Every build is tailored to create comfortable, healthy, and high-performance homes for families of all sizes.
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From well-considered updates to historic, heritage-listed homes to expansive rural properties, we bring beauty and functionality together in every renovation. Our high-end custom renovations respect the character of existing structures while incorporating modern sustainable practices and energy-efficient systems to enhance both livability and performance.
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We help guide you through the entire planning process, from initial design concepts to permit applications. Our collaborative approach includes assembling your personal team of local specialists—designers, engineers, electricians, plumbers, and energy assessors. We'll work with you to select suitable materials and fixtures, conduct comprehensive site visits, and navigate essential assessments throughout your project journey.
Who we are
At Keystone Construction, we believe in doing things properly, emphasising craftsmanship and the use of high-quality materials.
As a dedicated green builder, we love the great outdoors and strive to tread as lightly as possible on the environment. Our commitment to sustainable construction is reflected in our approach to every project, whether it’s a custom home build or a high-end renovation.
“I love to build beautiful, durable houses that are healthy, that are filled with light and that are better for the environment.”
Iain Wiebenga
Founder and Director
Trusted by homeowners across the surf coast
We had such a great experience working with Keystone Construction & Design. Iain was incredibly helpful right from the start – helping us make big decisions like choosing the right architect, weighing up knockdown vs renovation, and thinking through what made sense from both a lifestyle and investment perspective.
He walked us through different floor plan options and helped us focus on the areas that would really make an impact – both for how we live and for future resale. What really stood out was how chill, kind and understanding he was the whole way through. No pressure, just genuinely thoughtful advice that made us feel supported and confident.
Highly recommend if you’re looking for someone who actually listens, understands your vision, and gives honest, expert guidance.
ANGIE J.
LARGE RENOVATION, TORQUAY
We engaged Keystone to largely demolish and rebuild our house at Anglesea during 2024-2025. We found them to be a truly professional outfit from start to finish of the project. They provided a competitive and well researched quote. Iain Wiebenga helped refine the specifications for the project with his outstanding industry knowledge including of quality building products and suppliers. His assistance with getting the project started was invaluable including his assistance navigating building surveyor and other approvals.
The project was completed ahead of time and within budget. The quality of the work is quite simply superb. Site supervisor Peter Gordyn is a tradesman who strives for and achieves perfection and expects the same from all of the tradespeople on site.
Quite simply we could not be more pleased with the outcome and could not recommend the Keystone group more highly. They are outstanding builders and as a bonus they are very nice people to deal with.
TIMOTHY L.
LARGE RENOVATION, ANGLESEA
see our projects
Start your custom build with us
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