We just had a house built and opted to go with a single sink in the masterbath in a granite countertop. The plans did call for the second sink but we didn't think we needed 2. Well, we now wish we had the second sink. Is is possible to add the second sink after the granite is in or does the granite counter have to come out? The single sink is an undermount. The counter is 7 feet long. The vanity is under the single sink, there is open space under where the second sink could go so access to get under the counter is no problem.