A professional cabin for wellbeing treatments such as saunas and the like, comprising an access wall (2) fitted with a door (3), allowing access to the inside of the cabin (1), a plurality of lateral walls (4) coupled to each other and to the access wall (2), and a roof (5) in turn being coupled to the lateral walls (4) and to the access wall (2) at least one of the lateral walls (4) comprises a plurality of prefabricated modules (14) mounted on top of each other, each module forming a horizontal band in the wall and substantially forming the entire thickness of the related wall each module also comprises a first finishing layer (9) at a first face of it which is towards the inside of the cabin (1) the roof (5) in turn comprises a plurality of prefabricated components (27) which are drawn near each other, each substantially forming the entire thickness of the roof (5) and comprising a second finishing layer at a lower face of it which is towards the inside of the cabin (1).
