On June 11, 2024, the United States House of Representatives passed HR 6543, the so-called “No Hidden FEES Act of 2023” which introduces federal regulations aimed at enhancing transparency and fairness in the advertising of hotel room and short-term lodging prices. A critical component of this Act is its preemption clause, found in Section 4(a), which establishes a national standard prohibiting states from enforcing any laws that conflict with the federal mandate. This provision has significant implications for state regulations, such as California’s SB 478, which also aims to protect consumers from hidden fees in various transactions. The scope and application of this preemption clause are essential for assessing how state laws will be affected and ensuring compliance with the new federal standards.