The One Front Door Amendment Act of 2026 amends the Construction Codes Approval and Amendments Act of 1986 to allow for multifamily residential buildings of up to six stories to be served by a single entrance and egress stairway under specific conditions. The Department of Buildings is tasked with promulgating rules by July 1, 2027, to facilitate this change. A new definition for "multifamily residential building" is introduced, specifying it as a building containing more than two dwelling units primarily occupied on a permanent basis.

In drafting the new rules, the Department must consider various safety requirements, including fire prevention measures, safe exit strategies for occupants during emergencies, and limitations on the number of units per floor or square footage. The bill emphasizes the importance of fire-resistive construction and adequate automatic fire sprinklers. Additionally, the Department retains the authority to further amend rules regarding multifamily residential buildings beyond the initial requirements set forth in the act.