​​​​​​​Home loan pre-approval is one such facility that many financial institutions make available for customers in which the bank allows the interested applicants with particulars in regards to their eligibility criteria even before they have made up their mind to purchase a house. The pre-approval is valid for a limited period. This period is usually valid for 6 months. It varies from banks to banks. The rules are set as per the internal principles and guidelines. You can get in touch with your bank for more information about pre-approval of home loan.