Like the other responders said.....check with your building department or on-line public records to see if there are open permits. However I don't support one of the responders idea of finding a lender who will accept a property with open permits. The whole idea of getting a permit is to protect the owner and insure that the contractor built the room or additon to "Code" and withing village zoning ordinances. If there are open permits, the building dept. will arrange to inspect the work done and then if the work complies with existing codes, they will send you the "CC" (Certificate of Completion). It's that simple. If the work does not comply with codes, then the seller would be responsible to correct any work deemed unacceptable by the building dept codes. Then you, the buyer will be protected and not adopt problems for when you want to sell. Permits are necessary for a good reason!