When building in existing structures, the assessment of the stability and load-bearing capacity of the components that remain in their installed state can still be carried out according to earlier design and construction standards for reasons of building preservation. With this Beuth practice volume, construction professionals receive a comprehensive compilation of historical design and construction standards from the years 1900 to 2007. The standards are printed in excerpts in connection with essential calculation examples. Additional explanations of important passages provide a solid foundation for compliant construction execution and simultaneously support the preservation of the substance of old buildings.