Alchemilla Architects are pleased to announce that their office building for the Devon Business and Education Centre in East Devon has just been granted the seal “Certified Passive House”. The building passed its final air-test with a result of less than 0.6 air changes per hour. The heating demand is limited to 15kWh per square meter of living area and the total primary energy demand is less than 120kWh per square meter of floor area per year. The main source of heat in addition to the sun is a small wood-burning stove, with some complementary heaters for the teaching rooms for particularly cold, overcast days.