Make sure that whoever you hire doesn't kill or remove the bees and leave their nest and honeycomb behind. Expect these to attract new bees. Prevent a new problem by making sure that the old one is taken care of thoroughly. If the company needed to cut into any part of your home's structure to reach the nest and didn't repair the damage themselves, do so immediately. Assume that if one bee colony found this area to be a good place to build a nest, others will, too. Seal off their access to it as soon as possible. Close any other gaps, cracks, or other points of access, too. Remember: if one bee colony set up shop within a structure, others will do the same. Assess the area and identify any points where bees could access it. Seal those points with caulk, insulation foam, or whatever the situation demands. Limit the number of places where bees can build a nest. Remove any unnecessary junk that has accumulated and now offers bees a perfect spot to build a nest. Depending on which types of bees live in your area, also consider: Blocking access to crawl spaces and underneath raised structures like outdoor sheds, porches, or decks. Filling in old rodent dens and other holes in the ground. Putting compost into a container rather than leaving it as an open pile. Removing hollowed trees and logs.

Summary:
Remove all nests and honeycombs. Make all necessary repairs immediately. Clear your property of ideal nesting spots.