The commentary "Building and Property Drainage" is a competent guide through the current requirements for the planning, construction, operation, and maintenance of drainage systems, as outlined in the relevant standards DIN 1986-100:2016-09 and DIN EN 12056-4. These are among the most important and best-selling standards. The commentary is now available in its sixth, revised edition. Both standards are quoted in their original form and interpreted section by section. Numerous solutions demonstrate how users can implement the standard requirements. The commentary is aimed at craftsmen, planners, experts, officials in wastewater authorities, and anyone involved in building and property drainage in their professional practice.