The tower is a Category A listed building,[1] and all work was carried out in consultation with the Scottish Development Department (Ancient Monuments).

The repairs were completed in 2018 and on 1 April 2018, Gilnockie Tower and the Clan Armstrong Centre were opened to the public.

The building now consists of an authentic clan leaders house complete with furnished Grand Hall and Master Bedroom.

The tower also houses the Clan Armstrong Museum, previously located in the Episcopal Church in Langholm.

During the repair programme carried out between 2015 and 2018, the walkway was sympathetically brought up to date to meet safety standards.

[citation needed] The oldest part of the tower is thought to be the large stone by the doorway into the basement.

[1] Carvings of spirals and a key-like symbol are believed to date from the 2nd millennium BC, with the slab having been reused in the building.