expensive, but they will know what to do, how to do it, and make sure the company you choose, guaruntee's their work! Be aware that there are several standard treatments that company's use. And they dont all work. RESEARCH on the web what works, then research the pest company's in your area for the best choice. In the end the time and effort AND expense, will be worth it! Otherwise, you will never be free of them! This is not idle chatter, I have ben in your shoes! But the pest control company got the job done! Good luck!