AGATHĒ delivers healthy, high-performance homes in Castlecrag, combining building science, low-tox craftsmanship and North Shore expertise to create homes that support your family's wellbeing in Sydney's most architecturally distinctive bushland suburb.
Discover what it means to live in a home that actively works for your health: thoughtful material choices, ventilation design, and considered finishes where indoor air quality, thermal comfort, and low-tox living come together seamlessly with beautiful, functional design.
Castlecrag was laid out by Walter Burley Griffin and Marion Mahony Griffin to sit within the bush rather than on top of it, and the suburb's stone houses, low rooflines and unfenced bushland reserves remain unlike anywhere else in Sydney. That architectural legacy comes with particular building physics: stone and masonry that wick ground moisture, flat and low-pitched roofs that demand faultless drainage, and deep, deliberate shade that keeps homes cool in summer and damp in winter. Renovating here means respecting significant architecture while quietly correcting what decades of bush moisture have done. We bring the building science to do both: moisture control, ventilation and low-tox materials, handled with care for the original architecture.
Partial to full-scale renovations that transform your existing spaces into healthy, beautiful family living environments.
Custom extensions that integrate seamlessly with your home's design, enhancing space, comfort and value.
Start the right way with our PAC-certified process, aligning design, budget and timeline before you build.
Scandinavian-inspired homes and cabins built to a healthy, high-performance standard.
Builder-led delivery of custom homes and Passivhaus builds, managed end to end.
We build architectural and Passivhaus homes in Castlecrag, led by a Certified Passivhaus Tradesperson. Measured, tested and independently verified.
Whether you are at the early thinking stage or ready to move, we are happy to have a clear, straight conversation. No obligation. We will tell you if we are not the right fit.