Roof Tune-Up Service business. Business Overview A roof tune-up service should not to be confused with a roof repair service or roof replacement contractor. Roof tune-ups are a proactive maintenance measure as opposed to reactive measure, such as repairing a leaking roof. The average roof now costs in excess of $5,000 to replace, and roof repairs can cost as much as $1,000 to correct a leakage problem, not including the costs to repair any interior water damage that may have...