A full scan of the plantroom and 3D modelling of existing services was carried out to ensure duct, AHU and Chiller plant installation were 100% detailed, eliminating the need for site measurements. Working collaboratively with BAC and their stakeholders, VAE have demolished and replaced thirteen AHUs, decommissioned, and demolished two existing (1600kW) Chillers, installing one new (3200kW) Chiller in its place. Redundant plant was removed via a louvred façade and prefabricated pipework for the new plantroom equipment was installed. These works were completed during the airports 12-hour shutdown window between 1800 – 0600hrs minimising the impact of construction work on the operational airport.