Green roofs are not only aesthetically pleasing: they create valuable biotopes in the city, improve air quality, and offer significant construction and physical advantages. They cool in the summer, warm in the winter, and extend the lifespan of a roof. Additionally, they can be easily and cost-effectively installed, even as a retrofit. This construction guide provides practical and easily understandable instructions on how residential and office buildings, as well as garages and carports, can be equipped with a green roof. The author provides detailed information, supported by numerous photos and drawings, on what to consider during planning and the various roof structures that are possible. He presents proven systems for greening flat and sloped roofs, including all important construction details, discusses costs and economic viability, and offers tips for DIY construction.