The cost of treatment varies from state to state and also depends on the type of cockroach and the size of the home. For example, german cockroaches are typically more expensive then american or australian roaches to treat because of the level of difficulty involved. As a very general rule of thumb, I would plan on a couple hundred dollars for an initial treatment. Most companies will offer ongoing plans, which should be considered, as the goal is to kick out the roaches and keep them out, which is an ongoing process.