The short answer is that most ADU projects in Portland take between 4 and 10 months from first consultation to move-in, depending on design complexity, permitting timelines, and construction scope.

However, the construction portion itself is typically much shorter. The majority of time in an ADU project happens during the design and permitting phases before construction begins.

While both an accessory dwelling unit (ADU) and a home addition expand your living space, they serve different purposes. In Portland, the decision often comes down to how you want to use the space: multigenerational living, rental income, or simply a larger home for yourself.

Accessory Dwelling Units (ADUs) have become very popular with homeowners in Portland, Oregon. Many people want to improve their homes and increase property value. Others want to earn rental income or provide space for family members, like aging parents. If you want to convert your garage or build a new unit, you need to know about ADU development.