Plečnik designed the oratory as a place where relatives can say goodbye to the deceased in private. This is why it is not dedicated to any saint. The oratory features a longitudinal temple-like ground plan with a three-axis facade made up of vertical window openings divided by stylised Egyptian embalming vases. The central Doric column, supporting the triangular face, conceals the entrance to the oratory. The tympanum above the entrance is borne by large volutes. A magnificent baldachin precedes the entrance to the oratory, supported by four columns with ornamental capitals featuring frieze with a stylised garland. Below the baldachin are the podium and catafalque with a similar ornamental pattern. The top of gently rising stairs with a landing is found in the northern part of the oratory along with a monumental black marble altar contrasted against the white background of the altar wall. The oratory also features simple wooden benches on massive artificial stone stands. The altar is decorated by massive brass candle holders and hanging over it is the cross with the crucified Christ. Three chandeliers are hung in the aisle; the central is ornamented with a branched out flower pattern and the one closer to the entrance is shaped like a boat. Plečnik adopted the motif from a late antique oil lamp.