Residential Additions in Portland: Permits and Application Requirements
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Source: Residential Additions in Portland: Permits and Application Requirements ↗ Last modified: Sun, 19 Apr 2026 20:05:50 GMT
Do you need a permit for an addition?
Yes, a building permit is required for an addition to one or two-family dwelling units.
If you're making structural changes, like adding a dormer, a second floor, or expanding the footprint, you need a permit.
Depending on your project, you may also need an electrical permit, a mechanical permit, and a plumbing permit.
Your project needs to comply with zoning requirements. Find out what you can do on a site. ↗