The award winning upgrade and refurbishment of the Sydney Town Hall combined structural innovation and major services installations all within the confines of one of Sydney’s most recognizable and important buildings. The major aspect of this project was a 5.5 metre deep excavation under Town Hall requiring exceptional technical attention, along with a major roof refurbishment. The 5.5 meter excavation required massive temporary steel trusses and underpinning works to be installed to support the building prior to the excavation work commencing. The excavation in-ground, which was once part of Sydney's first cemetery, was subject to comprehensive archaeological investigation. Refurbishment of the existing roof included the replacement of slate tiles, new lead flashings and waterproof membranes to concrete roof slabs. The works involved the unobtrusive installation of fire sprinklers and other services into the building.