The indoor Cholargos "Antonis Tritsis" Gymnasium (capacity 1,240 spectators) has been the headquarters of KO Cholargos since 1990 and hosts all the home games of the men's team in the championship and Cup.

The indoor gym of Cholargos is located in the 'damari' of Cholargos and is also used by other local clubs active in the sports of women's basketball, volleyball and rhythmic gymnastics. On a weekly basis, it is estimated that more than 300 athletes and children exercise in the indoor gym.

The indoor gym was renovated in the summer of 2018 in the context of the participation of the men's basketball team in the A1 championship. The offices of KO Cholargos are housed very close to the closed one, in Damari behind the "balloon" and remain open on a daily basis in the afternoon hours.