As of September 10, 2016 due diligence is required to be performed. Due diligence is their right to investigate the physical location and the area around it.This is used to prevent potential buyers from ending contracts. Contractors in PA are only required to have 50k personal injury and 50k property damage insurance. You cannot cancel bids or back out of a sale after the auction, so please complete your due diligence before you bid. The amount of due diligence required varies for every deal. Due Diligence: Due diligence requires the buyer to investigate and discover various information about the commercial property.