Wasp can become very annoying, once its population expands. There are two general methods used to remove wasp nests. Pest control specialists either apply a chemical directly to the wasp nest. This chemical generally takes care of the whole colony. In more difficult cases, the pest control specialist will apply special dust that is carried back by the worker wasps to the queen. In order to eliminate the whole colony you have to get rid of the queen wasp. It is common for bees to find their way to trees, roofs, and walls.
Do not seal up hole where wasps are going in and out of. This will lead them to build a nest inside your wall and gain access to your house.