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The City of Portland, Oregon

Development Services

From Concept to Construction

Phone: 503-823-7300


1900 SW 4th Ave, Portland, OR 97201

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Residential Permits

The structural requirements for residential projects may be either prescriptive or engineered. In prescriptive design, the ORSC (Oregon Residential Specialty Code) defines a conservative method of construction to resist vertical and lateral loads. In engineered design, an engineer licensed in the State of Oregon prepares engineering calculations and drawings that demonstrate how the structure resists vertical and lateral loads.

View the current State Building Codes and Rules. Refer to Commercial Permits, above, for information regarding engineered residential design.

The following are design values may be used for prescriptive residential design:

Wind: Applicable design wind pressure is 18 psf (ASD).
Seismic: Applicable Seismic Design Category is D1.

Solar Installations:

Residential Non-Prescriptive Solar:

Underpinning using Slender piles: