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Development Services

From Concept to Construction

Phone: 503-823-7300


1900 SW 4th Ave, Portland, OR 97201

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Getting Started

A building permit is required to build an accessory dwelling unit. Depending on the scope of work, your project will most likely also require electrical, plumbing and/or mechanical permits. For new construction, your permit will be reviewed under provisions of the current Oregon Residential Specialty Code. View more information on building codes

It is recommended that you visit the Development Services Center to talk with staff about your project while in the planning stages. Staff can help you determine if an ADU is allowed on your property and to discuss zoning standards that are applicable to your project. They can also help answer questions about the building code and applicable construction standards, and utilities.