Municipalities and counties in Arizona may no longer require a stamp from a professional engineer to approve a solar system installation, which can raise the cost of a permit, unless such a certification is deemed necessary. In cases where an engineering stamp is deemed necessary, the city or county must provide the permittee with a written explanation of why the stamp is necessary.
Any building or permit fee assessed by a county or municipality for solar construction must be directly attributable to and defray the expense of the service for which the fee is charged. Rather than using the permit fee as a vehicle to increase revenue, the city or municipality may only charge the permittee exactly what it costs them to issue a permit. Further, before adopting a standard permit fee, the county or municipality must hold a public hearing with at least fifteen days of public notice.