The Building Code (BauGB) is the most important legal source of urban planning law. The long-established commentary on the BauGB, known in the professional community as the "Schrödter," stands out for its strong practical relevance and scientific quality. This standard work provides information on the latest developments in legislation and explains the interconnection of building planning law with environmental law, including emissions protection law, nature conservation law, and water management law. Municipalities can learn about design options and limitations in land-use planning and the conclusion of urban development contracts. The 2018 edition takes into account the latest reforms by the legislator, such as the BauGB amendment of 2017, changes to the TA Lärm, and the 18th BImSchV.