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Development Services

From Concept to Construction

Phone: 503-823-7300

TTY : 503-823-6868

1900 SW 4th Ave, Portland, OR 97201

Residential Permits

This page offers links to additional information for new construction and improvements to houses, duplexes and two-unit townhouses. For more information about the permit process and related requirements, select the project type that applies to you.


Accessory Dwelling Units (ADUs)

Information on Accessory Dwelling Units (ADUs) and adding a dwelling in an existing structure.

Conversion to Living Space

Information on converting your attic, basement or garage into additional living space.

Dormer or Second Floor Additions

Information on adding onto your house or duplex, when the scope includes expanding the upper story or attic outside of the existing roof or envelope.

Enlarging the Building Footprint

Information related to adding onto your house or duplex, when the scope of work includes new living area outside of the existing walls.

Garage, Shed, Accessory Structures

Information related to small, non-habitable structures on the same property such as a house or duplex.

Manufactured Homes

Information related to manufactured homes: putting one in a new location or altering an existing home.