When construction lot 3 was completed on 31st March 1999, the outer walls, spar-type frames and staircases had reached a height of 24.30 m. The steel structure for the five galleries had been erected and the piers built to 18.37 m. The Frauenkirche foundation noted that thanks to the great commitment of all people involved, construction work was progressing much faster than scheduled (completion scheduled for the end of 1999).  

The first stage of construction lot 4 began with scaffolding and carpentry work. A roofed drawing floor was mounted in front of the west side where the lagging for the arches between the piers was assembled. 

When the piers had reached a height of 21.40 m, work began on the arches between the piers and the arches to the spar-type frames. Four arches spring from each of the piers. The work was literally ‘cut out’ for the stone planners. The height of the layers, joint covers and geometrical form of the stone had to harmonise. Spatial representation with the computer was a great help. The laggings for the arches which the carpenters created were true works of art. One arch lagging set up on steel girders between the piers was curved in itself because it adjoined conically diverging lines of the piers.  

The building did not grow as fast in this and the next year since the amounts of sandstone in cubic meters increased per running metre and complicated laggings had to carry the newly-placed arches and vaults.