The Phase 1 redevelopment of Mercy Hospital in Mt Eden was subject to stringent planning constraints designed to preserve the viewshafts of the adjacent Maungawhau / Mt Eden volcanic cone. As a result, the building’s height was carefully limited to respect these cultural and environmental considerations.

To deliver over 6,500m² of clinical space within strict height limits and a compact footprint, the team undertook a complex 9-metre deep excavation immediately adjacent to a fully operational hospital. Managing settlement, noise, vibration, and the stability of variable volcanic ground conditions required meticulous engineering, contingency planning, and close collaboration with geotechnical partner Initia and construction contractor JFC. The retaining solutions included reinforced concrete secant-piled retaining walls with multi-level ground anchors, optimising constructability, ground stability during excavation, and usable space in the new building.

While the building maintains a modest presence from the street, it houses a world-class surgical facility. This includes 10 state-of-the-art operating theatres, a 17-bed post-anaesthetic care unit, and a 12-bed intensive care/high-dependency unit - setting a new benchmark for surgical care in New Zealand. Structure Design led the complete structural and seismic restraint design for the project—from concept through to completion.

The result: a landmark facility delivered with minimum disruption to existing hospital operations, no damage to surrounding structures, and zero surgical downtime—meeting the critical aspects of the client’s brief. Structure Design is proud to have helped shape a facility that sets new standards in safety, resilience, and healthcare excellence.