Segal House by Fraher & Findlay is the winner of the Environmental Leadership Prize. The extension follows the construction ideals of the original house, which was designed following architect Walter Segal's self-build methods. The Environmental Leadership prize, sponsored by Airflow, is awarded to the project that exhibits thought leadership for environmental considerations such as long-life design, sustainable materials and energy efficiency.

The design in Forest Hill looks to create a negative imprint of the building by inverting the panelled colour cladding. Profiled metal sheets form a rain screen cladding, with electric blue window apertures contrasting to the black extension. A wildflower roof caps off the building within its green setting. A dynamic staircase sits within the building, providing a studio, den, storage and reading space. The extension to the living spaces is a wedge that although narrow (1.2m wide in parts) significantly enhances the quality of the existing house.