The refurbishment and interior redesign of the Palace of the Commonwealth in Warsaw is underway. Preparatory work has already begun, including the protection of elements not planned to be modernised (among these, windows, radiators, parts of doors and walls). 

In addition, the old floors are being dismantled (in the Knights’ Hall on the ground floor, fragments of the floor are being removed in order to install floorboxes with electrical and telecommunication connections for various devices), and work is being carried out on the insulating layers and floor joists on the first and second floors. Parts of the existing sanitary and electrical installations are also being dismantled. 

Excavation of the underfloor layer under the parquet floor in the Hall of the Caryatids (located on the first floor) has also been carried out in order to assess the quality of the ceiling structure. 

Elsewhere in the Palace, conservation work has begun on the interior plaster, stuccoes and bas-reliefs. Plaster has been cleaned and loose layers of paint and mortar removed. Many rooms have micro-cracks in the plaster, most likely resulting from faulty workmanship during the renovation of the palace during the 1950s. After properly treated, these damaged areas are being filled with fresh mortar. Steel reinforcements are also being installed in the areas with wall cracks. Sculptures, bas-reliefs and stuccoes are being carefully cleaned, including the removal of the old painting layers.