11 Buttonwood was conceived as an environmentally responsive, user-friendly, and sustainable house development project. Despite a small plot size of 5684 sqft and challenging building regulations, this remarkable residence sets a new standard by achieving both building efficiency and fine architectural aesthetics. It proudly holds the distinction of being the country's first house to obtain the Platinum SEED certification. The grand Buttonwood tree along the driveway serves as a green welcome, providing not only a visual appeal but also acting as a natural sunshade and noise buffer from the main road, ensuring privacy. The house is strategically designed with abundant south-facing windows that proliferate the interior with natural light while offering pleasing views shielded from neighboring windows and services. The movable steel panels on the front terrace not only contribute to the façade's design but also provide flexibility and variations in appearance, enhancing privacy. The interior spaces seamlessly flow into each other, enclosed by floor-to-ceiling glass doors that create captivating shadow details. Local materials with a rustic, brutalist finish are tastefully incorporated throughout the house. Every inch of the valuable land has been purposefully utilized, including a small patio that offers visual relief, and porosity. Rainwater harvesting is implemented, and the majority of the roof is dedicated to solar thermal geysers and panels, ensuring electricity production and backup. Cleverly, a portion of the rooftop is reserved for a homegrown vegetable garden, demonstrating the optimization of space. 11 Buttonwood stands as an exemplary achievement, seamlessly integrating sustainability, functionality, and captivating design in a challenging context.