vHH were commissioned by Urban & Civic PLC in 2015 to design the first primary school for their Houlton development. A key requirement of the brief was that it could be expanded as the community grows. Our design provided one form-of-entry in the first phase, which opened in 2018, including the key communal spaces and facilities. In 2020, at our suggestion, Urban & Civic commissioned a POE of Phase 1. This demonstrated that whilst the various users appreciated the layout, rooms and daylighting of the building, there was significant variability in CO2 levels and comfort, and relatively high energy bills. Consequently, our design for Phase 2’s new classroom block utilises hybrid ventilation with MVHR, has a much more energy efficient envelope, and is fully electric. It is AECB Carbonlite certified, with the whole life carbon of phase 2 is c.50% of phase 1.