Davidson County follows Tennessee state licensing law, and the county or its cities issue the building permit for the job. Below: the state rule, the places inside the county, and live local coverage.
Tennessee requires a contractor licence at $25,000 and above and a separate Home Improvement licence for $3,000-$24,999 jobs in nine named counties; there is no garage-door classification, the closest being BC-6 Glass, Window and Door Construction.