The core activity of "Nachhaltiges Bauen Burmeister" is to advise and support customers in the planning, construction and modernization of buildings with the goal of implementing sustainable and energy-efficient solutions. The specific activities include: energy consulting and planning, creation of energy certificates and building modernization concepts, execution of BlowerDoor tests for air tightness of the building envelope, analysis and consulting on pollutants and condensation formation, support in applying for funding, quality management and consulting on sustainable building materials and methods.