Due diligence within real estate transactions refers to both the buyer and seller satisfying various aspects of a purchase contract before finalizing things. The inspection period is typically a 10 calendar day window provided to the buyer to research important facts and perform a physical inspection.We provide you with a FULL guide to help you find the answers to all your questions you may possibly have about your new home. The Arizona REALTORS® Residential Resale Purchase Contract Due Diligence Section: Inspection Period and Buyer Disapproval. In this report a careful inspection of title and physical condition of the premises is done before the transaction is completed. Due diligence is a critical process in real estate that involves researching and verifying information about a property before making a purchase. What should be on my due diligence checklist for real estate purchases? The purchaser must be willing to incur some up-front costs at the risk of discovering a condition that could lead to termination of the transaction. In Georgia real estate, the contingency is known as the "due diligence" period, and pretty much any inspection, or whim of the buyer is allowed.