The restoration focused on mitigating nearly 50 years of decay. Contractors faced severe spalling and surface damage caused by chloride attacks from the nearby Sydney Harbour and carbonation from the adjacent Cahill Expressway. To stabilize the structure, crews utilized the Penetron System, applying crystalline waterproofing grout and slurry to seal deep cracks and reinforce the concrete’s internal capillary pathways against future moisture ingress.
In section Releases
Sydney's Brutalist Sirius Building Reborn as Luxury Residences
After decades of exposure to harsh harbor air and urban pollution, Sydney’s historic Sirius Building has emerged from a comprehensive structural rehabilitation. The project, which concluded in late 2025, transformed the former public housing landmark into a high-end residential complex while preserving its signature concrete geometry.
Beyond structural repairs, the project reconfigured the site to meet modern luxury standards. The total floor area increased by 27% to approximately 8,320 square meters. While the original footprint remains, the building now houses 75 high-end apartments—down from the previous 79 public units—and features new amenities including swimming pools, a gym, and restored ground-floor communal spaces. According to Jozef van Beeck, Director of International Sales & Marketing at The Penetron Group, the redevelopment successfully balanced the preservation of the building's distinct Brutalist aesthetic with contemporary functionality, ensuring the landmark remains viable for decades to come.
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