All accessory structures require a building permit. This may include gazebos, outdoor fireplaces, fountains with plumbing, wind turbines, solar panels, radio towers, swimming pools, retaining walls, etc. there are additional zoning requirements associated with the location, maximum height and square footage depending on lot size. For more information, refer to Chapter 5 Supplemental Use Standards, Article 5.301 of the Zoning Ordinance.