The development involved the transformation of the listed heritage building into a modern 5 Green Star office space, with an integrated fit out for a single tenant, all new services and central plant, new core risers and toilets as well as additional lifts.
The addition of a new structure creating an additional 3,000 m² to the building’s gross floor area included the creation of a fully open 8 level atrium. Holmes Fire undertook both the Fire Engineering and Fire Protection Engineering design for the building over a 3 year period from concept design through to on-site commissioning of the smoke control systems. The design involved utilising computational fluid dynamics (CFD) smoke modelling combined with computer based occupant evacuation simulations. The fire engineering design was undertaken so as to not impose constraints upon the ability to maintain the openness of the atrium and central heritage stair and allowing for large contiguous floor plates.
An innovative far field velocity controlled smoke control system was developed for the building that leveraged the building’s HVAC design not only eliminating the need for many fire separations but critically not requiring smoke separations to the atrium nor to the central heritage stairwell, which allowed for the visual connection between floors and offering uninterrupted sea views to the upper storeys. To the best of our knowledge, we have been unable to find evidence of any similar design approaches being adopted either within or outside of New Zealand.