Garage Conversions: Gresham vs Troutdale
How do garage conversions rules compare between Gresham, OR and Troutdale, OR?
Gresham and Troutdale have similar restriction levels.
Gresham, OR
Multnomah County
Garage conversions in Gresham require building permits and must meet building code for habitable space. Converting a garage to living space may be treated as an ADU under Oregon law.
View full Gresham rules →Troutdale, OR
Multnomah County
Converting a garage into living space in Troutdale requires a building permit under TMC Title 15. If the conversion creates a separate dwelling unit, it also must meet ADU standards in TDC 8.170 and provide replacement off-street parking under TDC 9.010.
View full Troutdale rules →Key Facts Comparison
| Fact | Gresham | Troutdale |
|---|---|---|
| Permit | Required for all conversions | Required (TMC Title 15) |
| Building Code | Must meet habitable space standards | - |
| ADU | May qualify as ADU under Oregon law | - |
| Parking | Verify replacement parking needs | - |
| ADU Path | - | TDC 8.170 if dwelling unit |
| Parking Replacement | - | 1 space (TDC 9.010) |
| Surface | - | Durable (TMC 10.12.040(B)) |
| Code Section | - | TDC 5.010, 8.170, 9.010 |
Highlighted rows indicate differences between cities.
Gresham FAQ
Can I convert my garage to living space in Gresham?
Yes, with a building permit. The conversion must meet building code for habitable space including insulation, ventilation, and egress.
Does converting a garage count as an ADU in Gresham?
If the conversion creates an independent living unit, it may be treated as an ADU under Oregon law.
Troutdale FAQ
Do I need a permit to convert my garage?
Yes. Finishing a garage into living space requires a building permit under TMC Title 15. The work is inspected for life-safety, energy, and structural code compliance.
Does the conversion count as an ADU?
If it has its own kitchen, bath, and sleeping area, yes — it must meet TDC 8.170 ADU standards (up to 800 sq ft or 50%) and pass Type I review.
What about my required parking?
TDC 9.010 still requires at least one off-street space per dwelling unit. You'll need a replacement space on a durable surface under TMC 10.12.040(B) before approval.
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