Getting pre-approved is one of the most important first steps in the home buying process. Many buyers assume that once they receive a pre-approval letter, they are set until they find a home. In reality, pre-approvals are only valid for a limited period of time, and allowing one to expire can create delays, additional paperwork, and even changes to your borrowing power. Understanding how pre-approval timelines work can help you stay prepared when the right home becomes available.