AGATHĒ builds quality granny flats in Castle Hill, bringing expert craftsmanship and a genuine appreciation for this vibrant, family-loved suburb to create spaces that add real value and work beautifully for the way your family lives.
At AGATHĒ, a granny flat is never a budget afterthought in the backyard. It's a Scandinavian-designed, high-performance home in miniature — built with the same building science, natural light, low-tox materials, and considered craftsmanship as our Scandi homes. Beautiful, healthy, and built to last.
We turn generous backyard spaces into beautiful, self-contained homes — thoughtfully designed, carefully finished, and built to sit naturally alongside the character of your existing home. The result is a practical, elegant space for ageing parents, adult children, a quiet home office, or quality rental income.
Castle Hill is widely regarded as the crown jewel of Sydney's Hills District — and it's not hard to see why. With leafy streets, a strong sense of community, outstanding schools, and Castle Towers on the doorstep, it offers a lifestyle that genuinely has something for everyone. Generations of families have put down roots here, and with the Castle Hill Metro now making city access easier than ever, it continues to attract people looking for the best of both worlds — a relaxed, family-friendly neighbourhood without giving up urban convenience. Homes in Castle Hill tend to have solid backyards well suited to a thoughtfully designed granny flat. Whether you're looking to create a comfortable, independent space for ageing parents, a private retreat for adult children, a quiet home office away from the main house, or a quality rental in one of Sydney's most in-demand suburbs — we'll design and build something that fits beautifully into Castle Hill and adds genuine, lasting value to your property.
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 certified Passive House builds, managed end to end.
From design to delivery, we manage every detail for a smooth, on-time, on-budget build.
Whether you are at the early thinking stage or ready to move, we are happy to have an honest conversation. No obligation. We will tell you if we are not the right fit.