The extension of the Regenbogenschule Stolberg adjoins at the northern end of the existing main building facing west and fits into the slope via two standard floors arranged on a basement. Via a forecourt on Pommernstraße, the building receives a second entrance to the west. This access leads to the central foyer on level -2. The internal access of the new building takes place via a necessary staircase. Via a connecting building in level 0 and -1, the extension connects to the existing building.

20 pieces of root stub clearing, 2,000 m² of bushes cleared, 240 m³ of soil for trenches above shafts loosening/loading/descending, 53 m³ of soil for trenches above shafts/storage, 165 m² of trench wall shoring, 3 pieces of shafts, 30 m of RW lines outside the excavation, 40 m of SW pipes outside of the excavation, 90 m of temporary RW lines, 120 m³ of soil for trenches under floor slabs, 60 m RW pipes under floor slabs, 175 m SW pipes under floor slabs, 1 piece rainwater pumping station, 1,150 m² topsoil loosening/loading/dismoving, 6,850 m³ excavated excavation pit, 1,720 m² foundation cushion, shoring work 170 m boreholes for 190 m shoring carrier, 360 m drainage pipe, 14 control shafts

145 m³ soil for trenches above shafts loosening/loading/descending, 310 m³ soil for trenches above loosening/storing, 240 m² shoring for trenches and shafts, 18 pieces shafts, 1 piece grease trap, 475 m rainwater and waste water pipes in the backfill area of the excavation, 290 m³ foundation cushion, 1,780 m² fine level, 1,365 m² perimeter insulation under floor slab, 1,735 m² floor slabs, 890 m² formwork exterior walls SB3, 1,660 m² formwork exterior wall without SB requirement, 1,665 m² formwork inner wall SB3 on both sides, 556 m² formwork inner wall SB3 one-sided, 277 m² formwork inner wall without SB requirement, 410 m² in-situ concrete WU exterior wall SB3, 380 m² in-situ concrete exterior wall, 210 m² in-situ concrete WU exterior wall, 1,050 ² in-situ concrete interior walls SB3, 100 m² in-situ concrete interior walls without SB requirement, 1,630 m² slab formwork SB2, 840 m² slab formwork without SB requirement, 2,290 m² in-situ concrete ceiling slabs, 240 m² precast TT ceiling tiles with concrete, 4 pieces of prefabricated staircases, 140 tons of reinforcing bar steel, 112 tons of reinforcing mat steel, 1,785 m² fresh concrete composite film, 2,070 m² working and protective scaffolding, 155 m² exterior and interior wall masonry, 1,440 m² facing masonry