I'm with Bobby on this one. Although his comparison is not much better. If you have a contract, he should continue to pay the full price because you are still coming out and performing the service. In fact, it may be a little more difficult because you will be working around the construction guys and their equipment, trucks, etc..
If he's not on a contract, then you may want to adjust your price. But like it was said, if it's already at or near your minimum price, then you need to decide how much you want to make sure you keep this customer happy.
If he's not on a contract, then you may want to adjust your price. But like it was said, if it's already at or near your minimum price, then you need to decide how much you want to make sure you keep this customer happy.