But, they are called estimates for a reason, as we cannot always determine the full extent of the damage until the vehicle is in the auto body shop. Once the vehicle has been disassembled, we will likely need to prepare a supplement. The primary reason for a supplement is hidden damage that is not visible at the time of the estimate. Repair methodology may sometimes change, and parts price increases are very common. We will need approval from the responsible party before we can proceed with supplemental repairs. Both you and the insurance company will be notified. If your repairs are covered under one of our many direct repair programs, any delays should be minimal. However, there can be substantial delays associated with a supplement. It all depends on the responsiveness of your insurance company and supplemental parts availability.