Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Prison in a dream indicates the grave, illness, worry, or debt. Getting out of it is relief, healing, and payment of debt. Choosing prison indicates protection from strife.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Prison indicates wellness for the sick, or travel, or the marital home for a woman. Entering an unknown prison indicates the grave. A known prison is worry and grief.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Prison is interpreted as worry, grief, and hardship. Getting out of it is salvation from distress. Whoever sees himself building a prison will meet a misguided leader who calls people to heresy.