The core activity of defors GmbH is in building technology, particularly in the areas of: Water Engineering: planning and design of drinking water and wastewater systems, including ensuring drinking water hygiene and integrating energy-efficient solutions. Fire protection and building technology: developing sustainable solutions for building technology, including planning and design of fire protection systems and HVAC systems. Heat treatment plants (RWB): planning and design of heat treatment plants. Consulting and training: the company offers consulting services to customers and conducts training programs for professionals in building technology. The company is also active in standardization and guideline work and has employees who work as technical lecturers and members of working groups of SIA and DIE PLANER, SWKI.