Abstract The archeological reconstruction of the Frauenkirche in Dresden was begun immediately following the archeological removal of the rubble of the remains. In this process, four essential construction phases were realized during the time frame from May 1994 until August 1996. To start with, a small section of the wall at the southwest corner of the church was filled in Lot 0. Lot 1 was the realization of a larger wall section at the southwest corner. Further tasks were the renovation of the cellar up to the upper edge of the ground floor and the erection of a subterranean exterior structure. These tasks were preceded by comprehensive activities: review of existing documents (plans, photographs); evaluation of the existing building structure; soil investigations and material tests, preparation of a dimensioned drawing reflecting deformation of the building structure left standing as well as starting deformation measurements of the cellar walls of the ruin as well as of the ruin parts that were left standing. The objective was, in comparison to Bahr's concept, to develop an optimized concept for the support structure. In doing so, solutions had to be found which met the requirements for intended use as specified by the building's owner. The increased demand for space was satisfied with the concept of a subterranean external building, encompassing the church on three sides. One essential item within the scope of structural concept was the elaboration of a secure concept for the reinforcement of the foundations.