Looking at various factors such as heavy snow fall or high winds in certain areas, their local authorities decide the permit validations. If you are living in an area where carport or any building permits are necessary, they require quality standard certifications of metal buildings you are going to install. These types of buildings can be referred as Certified Metal Buildings which are designed by engineers and have specific ratings for snow load and wind. Certified Buildings include a tighter screw pattern, additional appropriate anchors depending on surface types. Please note there is no additional warranty on certified buildings. A certified building simply means the building is built to specifications and certified by a professional engineer to meet local building requirements.