Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The bathhouse (Hammam) in a dream indicates a man's wife or his maidservant. It may also indicate worry, grief, and illness. Bathing in it is repentance, healing, and removal of worry.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The bathhouse indicates the ruler's house, prison, or the house of transgressors. Hot water in it is worry and illness, and cold water is healing and wellness.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The bathhouse is interpreted as a woman of ill repute. Whoever builds a bathhouse will fall into a matter involving strife. Exiting it is salvation from hardship.