Trevi - Help Center Installation and renovation In-ground, Europea, Futura and Harmony Do I need a permit for the installation of my in-ground pool? 03 May 2022 15:24 Updated Yes. A building permit request must be made to your municipality along with the pool plan that will be provided by Trevi. See the Permit and Important Documents section of the Work Description Requirements Document. In-ground Semi-inground Still Need Help? Contact us or Place a service call Delivery or Pick-up Contact us Trevi client or Future client Installation or Renovation Contract number or In-store receipt number We will contact you within 24 hours.