Oregon.

Moderately to heavily regulated with seismic-zone requirements that significantly affect temporary structures. Portland adds local requirements on top of state code.

1. § 01

   Uses Oregon Structural Specialty Code (OSSC) based on IBC 2021 with seismic amendments

2. § 02

   Seismic zone requirements significantly exceed base IBC for temporary structures

3. § 03

   Home rule state — Portland and Eugene have additional local requirements

4. § 04

   State Fire Marshal requires tent permits with seismic bracing documentation for larger structures

5. § 05

   Oregon Building Codes Division handles statewide licensing and code adoption