Structure Height Limits: Gresham vs Portland
How do structure height limits rules compare between Gresham, OR and Portland, OR?
Gresham has fewer restrictions than Portland.
Gresham, OR
Multnomah County
Portland residential height limits are 30 feet in R5 and R7, 35 feet in R2.5 and RM1/RM2, and up to 45 feet in RM3 (PCC 33.110). Commercial and Central City zones allow 45-125+ feet. Height is measured to the midpoint of a sloped roof. Unincorporated Multnomah County RR zones cap at 35 feet. View corridors (Council Crest, Skyline) and historic districts impose additional limits.
View full Gresham rules →Portland, OR
Multnomah County
Portland's Title 33 (Planning and Zoning) establishes maximum building heights by zone. Single-dwelling residential zones generally limit height to 30 feet. Multi-dwelling and commercial zones have higher limits. Height is measured from average grade to the highest point of the structure.
View full Portland rules →Key Facts Comparison
| Fact | Gresham | Portland |
|---|---|---|
| Portland R5/R7 | 30 feet max | - |
| Portland R2.5 | 35 feet max | - |
| Portland RM3 | 45-65 feet | - |
| Central City | 325+ ft w/ bonus | 200+ feet in designated areas |
| Measurement | Grade to midpoint ridge | Average grade to highest roof point |
| Governing Code | - | Title 33 (Planning and Zoning) |
| Single-Dwelling (R5) | - | 30 feet maximum |
| Multi-Dwelling | - | 35-75 feet depending on zone |
Highlighted rows indicate differences between cities.
Gresham FAQ
How is roof height measured in Portland?
From the lower of existing or finished grade to the midpoint between eaves and ridge for pitched roofs, or to the highest point for flat roofs (PCC 33.930).
Can I exceed the height limit for solar panels?
Yes, typically up to 5 feet above the roof plane under PCC 33.110.215. Rooftop mechanical equipment has specific screening and height allowances.
Portland FAQ
How tall can I build in Portland?
Height limits depend on your zoning designation. Single-dwelling residential zones (R5, R7, R10, R20) generally allow 30 feet. Multi-dwelling and commercial zones allow more. Check Title 33 for your specific zone.
Do chimneys and antennas count toward height limits?
Some rooftop features like chimneys, antennas, and flagpoles may extend above the height limit with restrictions. Title 33 specifies allowable projections above the maximum height for each zone.
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