Particular attention is given to barrier-free equipment and furnishings to enable all individuals to use public buildings in a self-determined, independent, and autonomous manner. The commentary on the two parts of DIN 18040 ensures planning security and quality assurance. Part 1 of DIN 18040 provides the foundations for the planning of barrier-free public buildings. The commentary focuses on aspects such as accessibility, room geometry, and infrastructure. DIN 18040 Part 2 addresses the barrier-free planning, execution, and furnishing of apartments, buildings with apartments, and their outdoor facilities. It comments on the requirements for the infrastructure of the buildings to enable individuals with sensory and mobility impairments to use the apartments independently. The original versions of the DIN.