The Annexe is the games area at the Southern end of the main building. It is approximately 14m x 9m with a vinyl clad wooden floor in very good condition.
Facilities include male and female toilets, a kitchen sink and fan heating.
The Annexe has been used by the Mount Stuart Scout Group since its formation in 1959.
This area is suitable for games, Zumba, fitness activities, boot camps, martial arts, dancing, sporting activities Tai Chi and many other activities.