Is it permissible for an architect to prepare a cost report for a project, knowing that the client will use it to obtain a loan from an interest-based bank, especially considering that banks require a building permit prepared by him, and is this considered assisting in sin?
Preparing cost reports for someone to use for a usurious loan is impermissible, because it constitutes aiding in sin. Allah, the Most High, says: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression."
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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