Is real estate financing or a bank loan considered permissible (halal), given that the banks are Islamic, and is there another solution for buying a house in Saudi Arabia?

Real estate financing is permissible if the bank first purchases the property for itself and then sells it to you at a profit, provided specific regulations and conditions are met. However, a bank loan where the price is repaid with an increment is usury (riba) and thus forbidden. As for organized tawarruq (monetization), there is a detailed ruling: regular tawarruq is permissible, but organized tawarruq is forbidden according to the more preponderant opinion. It is advisable to consult specialized scholars in your country before conducting any transaction.