WBC4 is the fourth steel-framed office block at the World Business Centre (WBC) overlooking Heathrow Airport’s runways. Designed to be implemented in phases; each of the buildings is virtually identical to give the impression of a continuous terrace. Building 4 has been designed to provide a contemporary take on the first three pavilions, including sustainable design elements such as feature fins and solar glazing. The four-storey structure provides 8,000sqm of CAT A office space and 5,000sqft with reception and atrium, 161 car parking spaces with cycle spaces and electric car charging points. Constructed around a regular 9m × 7.5m grid pattern, the open plan office provides generous levels of natural daylight and views over the runway. We provided all mechanical, electrical and sustainability services for the project including overheating analysis, energy modelling, sustainability reports and ventilation strategy.