Alkimos Beach

Alkimos Beach is an award-winning, masterplanned coastal community located 40km north of the Perth CBD. A joint development between DevelopmentWA and Stockland, the project spans an expansive 224-hectare landholding and includes approximately 2,200 residential lots.

Since its launch, Alkimos Beach has rapidly evolved into a vibrant, sustainable urban community offering a wide range of amenities including multiple schools, safe beach access, a surf life-saving club, a bustling town centre with shops and cages, and an extensive network of parks and community spaces.

Since construction began in 2012, Cossill & Webley has played a central role in delivering the engineering components of the project. The team has designed and superintended earthworks and subdivision works for the entire estate. Bulk earthworks have been completed in undulating coastal terrain, with 3 million cubic metres of earth moved to establish levelled development platforms while preserving the site’s unique character and maximising views to the coast and surrounding bushland.

The engineering design has responded to both complex topography and sustainability targets. Cossill & Webley worked closely with the developer to design sloping lots that reduced reliance on retaining walls, replacing traditional limestone treatments with landscaped rock batters that enhanced the visual appeal of the streetscape. Collaborative workshops during construction also led to the use of drone technology to track progress, which proved highly valuable for both the developer and local authorities. In addition, 3D modelling was used to visualise earthworks across future precincts, improving communication and aiding decision-making.

Cossill & Webley has also been heavily involved in the integration of Water Sensitive Urban Design strategies throughout the development. These were carefully embedded from the early planning stages and included verge and median swales, tree pits, trapped infiltration pits, and bio-retention systems within road reserves and public open spaces.

Nationally recognised for its sustainability leadership, Alkimos Beach was the first WA project to achieve all six leaves under the UDIA EnviroDevelopment program and become Australia’s first 6-star Green Star community. It continues to lead the way as the first greenfield community to trial a large-scale community energy storage system, with a centralised battery network designed to support households with solar PV while avoiding the need for individual on-site systems.

Cossill & Webley is proud to be a long-standing engineering partner in this landmark development, helping to shape a community that sets a new benchmark for sustainable coastal living in Australia.