Is it permissible to take a loan from the Jordanian Islamic Bank for construction, where the bank pays the value of material invoices agreed upon by the buyer and the merchant directly to the merchant, with a profit margin for the bank, even though the bank does not own these materials?

As long as banks do not own the commodities before selling them, it is not permissible to deal with them. It is permissible to obtain materials through a Murabaha system that adheres to Sharia (definition) guidelines, provided there is a non-binding promise from the client to the bank to purchase the materials. The bank then acquires and truly owns them, and subsequently sells them to the client in fixed installments, without any prohibited conditions such as usurious increases upon delay or the requirement of commercial insurance. If these conditions are not met, the transaction is not permissible, even if the bank is Islamic.