The possibility remains that an infestation may be hidden inside a wall void or beam. The company will recommend and usually propose appropriate treatment to control the pest. For termites, a treatment may be warranted for a year or longer, usually meaning if an infestation is found while the warranty is in effect, the company will retreat at no charge to you. It may be superficial or quite extensive. Damage is evidence of infestation, but evidence might not include damage.
Some companies make estimates on the repair of the damage if they feel it is necessary.
Most companies do not have the expertise and will recommend a qualified building contractor. However, in some states it is common for companies to make the repairs. Recommendations from people who have had satisfactory experiences with a pest control company in the past is one method of selecting a firm. If you must select a company at random, you can check with your local Better Business Bureau, Chamber of Commerce, or your state agency governing pesticide regulation. Companies belonging to the national Pest Management Association or state pest control associations have joined together in an effort to promote professionalism.