In 2018, the excavations identified a new forepart attached to the polygonal enclosure in the north part of the site, and excavation of the gate in the outer curtain wall, at the south-eastern edge of the area, continued. The resulting evidence suggests the possible existence of a flight of steps that would have overcome the difference in height between the summit plateau and the base of the entrance.

In the area outside the tower, in correspondence with the south side, several charcoally layers were excavated, probably the result of the burning of timber elements, connected to the tower walls, evidence of which was seen in the previous campaign.
The remains of the fire overlay an abandonment layer, datable to the 14th-15th century, which had obliterated an area paved with sandstone slabs, bonded with mortar, and cobblestones. The identification of a posthole in this paved area suggests the presence of timber structures abutting the side of the tower.

Lastly, the cistern area was excavated, where together with recent activity, perhaps agricultural, wartime explosive devices were found, which indicate that the castle was reused as a deposit by the partisans.

The investigations completed thus far have identified structures mainly attributable to the refortification begun in the 1350s. This was promoted by the municipality of Pistoia that had made provision for the construction of a _ fortilitia_ sive roccha in Castrum de Muris, also restructuring some of the buildings already present in the castrum, such as the tower, the external curtain wall, the cistern, and several domus.
Information obtained from oral sources confirms the memory of the existence of an entrance on the south-eastern part of the plateau, where the gate in the external curtain wall was identified. There was also recollection of a pathway, no longer visible, which linked Monte Castello to the nearby village of Lizzano. In use during the last century, it functioned almost exclusively as the processional route on the occasion of the feast of the Assumption.