Portland, ME Accessory Structures: Carport Rules (2026)

Portland treats carports as 'detached covered accessory structures' subject to both MUBEC and the Land Use Code. Unlike sheds, a roofed parking structure is not exempt from a building permit on the basis of floor area alone if it requires footings, posts, and a roof load capable of supporting snow loads under Maine's MUBEC snow-load schedule. The structure counts toward lot coverage and must observe the side and rear setbacks of the applicable zone — typically 3-5 ft for residential zones under the ReCode Land Use Code (effective December 4, 2024). A carport may not be located within a required front yard. Maximum height for detached accessory structures in residential zones is generally 18 ft. Open-sided carports are still considered structures for setback and lot-coverage purposes — having no walls does not exempt them. The Permitting & Inspections Department evaluates the application against zoning standards (Chapter 14 — Land Use / ReCode), building code (MUBEC), and historic-preservation review where the property is in a Portland historic district (Chapter 11).