Although the process of the bath determines the position of the various apartments in relation to one another, the exact disposition of the plan must be governed by the shape of the ground to be covered, the nature of the site and surroundings, and--if the bath be constructed in an existing building--the amount of space allotted to it. The _relative_ position of chamber to chamber of the sudatorium, and of the latter to the cooling rooms, must remain more or less constant; but the angle of connection with each other, their shape, proportions, and floor levels, must, together with the positions of the subsidiary apartments, be determined by the exigencies of the site, and considerations of convenience and economy. Frequently, the architect will be called upon to design a bath in a given space in the lower floors of some existing building. He may be given the ground or basement floor to make the most of as best he can. His plan is thus considerably hampered. If the site includes the basement and ground floor of an ordinary house, he may arrange the offices and cooling and dressing rooms on the ground floor; and the hot rooms, shampooing room, and bath rooms, in the basement. Where possible, the hot rooms should be pushed out beyond the back wall of the houses, and lighted from the top. In cities, the hot rooms will often have to be in the actual basement. Where space is valuable a whole house may be given up to baths if the floors be made fire and heat proof. The basement may be devoted to hot rooms and shampooing rooms, the ground floor to offices and dressing rooms, and the first floor to cooling rooms. Ladies' baths, again, can be arranged on the floors above, and both baths can be heated from one apparatus. In a bath where three floors are available, the first floor may be devoted to extra cooling and dressing rooms. In inexpensive sites the bath may be all on one level. This is the most convenient arrangement, but in large cities is generally too costly. The Hammam and Savoy baths, in London, are, however, all on one level, the former being practically all above ground, and the latter constructed in the basement of an existing building.