In 2015, the conservation activities at the theatre included work on the eastern and western wall of the central radial corridor (radial walls 13 and 14), the northern face of circular wall II, the southern face of circular wall III and the vault above the central circular corridor.

The damaged parts of deteriorated bricks and crumbling mortar at the two radial walls is 1.20 metres high, while the damaged parts of deteriorated sandstone and mortar is around 3.5 metres high at the faces of the circular walls. Similar damages of cracked stones and falling off mortar are documented at the preserved segments of the vault above the central circular corridor.

The preparation work included removal of the deteriorated material from the brick faces of the radial walls 13 and 14 and the sandstone faces of the circular walls. The walls were washed after the crumbled material was taken out. The solid stones from the removed masonry were collected for reuse and a selection of solid grey sandstone, found during the excavations at Stobi, was also done.

The next step of the process involved restoring of the damaged parts with bricks at radial walls 13 and 14, and restoring of the circular walls. The restoration was done with the useage of lime based mortar, new bricks similar to the ancient and sandstone found during excavations. As final activity at the end of the process, the crumbling mortar between the stones at all positions was replaced.

The conservation of the vault above the circular corridor started with construction of a supportive scaffold with a wooden semicircular top, placed directly under the vault. The damaged areas were cleaned and the crumbled sandstone and mortar were replaced with new. Restoration and reconstruction of the vault started from the preserved segment and extended 6 metres towards the eastern end. The restoration and reconstruction of the remaining part of the vault is planned for 2016.