The project included complete refurbishment, renovation, rehabilitation, and waterproofing of the existing building. Parts of the roof were replaced and re-waterproofed, in most cases this was done using applications such as lead, as it would have been when the building was originally built. The interior of the building required extensive refurbishment. Ceilings and timber floors were replaced; as well as all electrical reticulation and plumbing. A new air-conditioning system was installed, along with extensive steel shelving and archive rooms, all in line with the requirements of the new tenants, the Master of the High Court and Justice Department.
Colonial Building is a fine example of 19th century Victorian architecture. Many of the impressive sculptures on the façade of the building had been damaged over the years. Using traditional methods and systems many of these sculptures were re-created and restored to their original splendour. Where possible, original materials were re-used, where this was not possible, elements were replaced using similar materials as close as possible to the original.