Miami-Dade has two layers of local government. Each city has its own building official, who handles permits, inspections and building recertification inside that city. Properties in unincorporated Miami-Dade are handled by the county, and you can spot them by a folio number that starts with 30 on the Property Appraiser’s site. Before you sell, find out which office has your file. A city permit will not appear in a county search, and a county violation will not show up at city hall.
For unincorporated properties, the county says sellers of residential property must disclose illegal construction and outstanding code violations. It also warns that many home inspections do not check for them. The county offers a lien search ($250 per folio, with a letter listing all violations) and an open-permit search ($43.75 per address or folio). Inside a city, ask that city for its own lien and permit letters. The City of Miami and Doral, for example, run their own recertification programs.