The walls in the rooms of the baths in the building phase which survives today had marble revetments on their base, while the upper parts were decorated with wall paintings. The representation of the design of the revetments on the east wall of the large hall was based on the mapping of the metal supports preserved in situ and the imprints left by the marble slabs in the mortar.
The niches of the bathing tub in the large hall would have had wall mosaics, as shown by the fragments preserved in the east niche.
The floors in the halls were paved with marble slabs, remains of which survive in the vestibule and large hall. The substrate of the floor in the large hall was made of a succession of layers. The lowest one had a thickness of 4 centimeters. It consisted of natural aggregates and stone chips in places, and rested on fill 0.70 meters in height composed of earth, stones, marble and tiles. There followed two layers (6 cm. and 8 cm. thick, respectively), of which the first consisted of a very strong plaster mortar and the second of plaster mortar which contained a high percentage of crushed tiles as aggregate. The final paving was of white and colored conglomerate slabs (breccia polichroma della Vitoria), many of them reused.
During conservation and restoration work on the floor in 2003, part of a marble slab was revealed which on its rear face carried an inscription according honors to Silvanus Nikolaos II, most illustrious consul, who had his seat in Macedonia in the 3rd century AD. The missing part had been found during excavation of the building in 1971. When the two fragments were mended, it was determined that the slab came from an honorary altar that had been erected in Veria (Beroea) or Thessaloniki by the city of Veria (Beroea) in honor of its benefactor Silvanus. In the first case, the altar was transferred to Thessaloniki for use as building material in the construction of the Galerian Complex. This version is lent further support by the fact that in late antiquity Veria (Beroea) was a transit center for the marble trade.