Engineering systems of internal fire-fighting, cold and hot water supply, drainage and drains of buildings are presented. Their main schemes and elements are considered, as well as the operation of the equipment used. For each system, theoretical and practical materials are provided that are necessary for the calculation, design, construction and operation of plumbing systems and equipment. The regulatory framework for the design of engineering systems for water supply and sewerage of buildings is given, recommendations for the installation and operation of systems are given.