The erection of the outer structure was the most important task in 1995. Covering an area of 1,300 m², the new structure houses the functional rooms required to meet the needs of contemporary usage such as cloakrooms for visitors, sanitary facilities, and dressing-rooms for artists, lounges, service rooms for ventilation, energy supply and emergency power generation as well as a transformer substation. The reinforced concrete structure that was designed as a ‘white tank’ encircles the east side of the church in a ‘U’-shape and nestles against George Bähr's foundations leaving just a settlement joint. The masonry of the foundation could be inspected and stabilized at the same time. 

Another essential task was the reconstruction of the historic basements. The original historic structure was partly dismantled and rebuilt so that is was strong enough to bear the new building. Existing masonry was grouted, cracks were bridged through spikes, large compound units braced with anchors. Exposed wall surfaces that had been heavily damaged by the fire were repaired. A reinforced concrete floor and ducts for the ventilation and heating systems as well as for laying the cables were placed in the main basement. Furthermore, a damp course was installed. All preparatory work necessary for building the vault was now finished.  

Another trial section was erected at entrance C in 1995. A canopy had been built as protection against sun and rain. The use of a tower slewing crane in connection with the first trial lot did not work out well. A better solution thus had to be found for laying work. An overhead travelling crane with trolley proved to be a good alternative. Nevertheless, the transport process still took too much time. Further improvements were however made.