Can I avoid permits by calling my home temporary or accessory?

No label by itself removes code or permit requirements. Under the IBC, temporary structures are limited to 180 days unless extended, still require a permit from the building official, and must meet safety requirements. Philadelphia's code bulletin, for example, does not allow temporary certificates of occupancy for residential occupancies. Accessory structure is usually a zoning term defined in each local ordinance, and whether a building used for sleeping or living qualifies, and what it needs, depends on that ordinance and the adopted building code. Ask your planning and building offices in writing how they would classify your exact use before you buy or place it.

Check your local rule. This varies by state, county or city. Your permitting office has the final word; the official lookup pages below show you who that is.

Sources

• IBC Section 108 Temporary Structures (BCAC)International Code Council
• Code Bulletin A-1501 R1: Temporary Uses and StructuresCity of Philadelphia L&I
• Significant Changes to the IBC 2021 Edition: Section 3103.1International Code Council