Trevi - Help Center Installation and renovation In-ground, Europea, Futura and Harmony Can I change my plan at any time? 06 June 2022 14:25 Updated It is critical that you review the plan with the designer to approve everything. No revisions will be possible 48 hours after the first plan is issued. See the Drawing section of the Work Description Requirements Document. In-ground Harmony 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.