Ḥarām Gains: Can a Muslim Work on Buildings Used for Sinful Activities?

Practical Laws of Islam as per the teachings of Imam Khamenei

Ḥarām Gains: Can a Muslim Work on Buildings Used for Sinful Activities?

English:

Question #1095:

What is the ruling on working in decorating buildings, especially when the place destined for such a make over could be used for committing ḥarām acts such as worshipping idols? And is it permissible to build a hall, which may eventually be used for dancing and the like?

Answer #1095:

In itself working in decoration is no problem unless the decorated places will be used for committing ḥarām acts. However, it is not permissible according to Islam to decorate a room specified for worshipping idols e.g. to set its furniture and to determine the place of idols. The same ruling is applicable to construction of a hall for ḥarām uses, but the mere likelihood is not objectionable.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Ḥarām Gains