New Detached ADU

What a detached ADU is

A detached ADU is a fully independent dwelling on the same lot as your primary home, with its own entrance, kitchen, and bathroom. Because it stands on its own, it offers the most design freedom of any ADU type, and it keeps the new unit physically separate from the main house.

Typical uses

• Long-term rental income from a separate backyard unit.
• Multigenerational living, such as housing for aging parents or adult children.
• A guest house, home office, or studio that can later become a rental.
• Added long-term property value and flexibility.

What the matched builder handles

We are a matching service, not a contractor. The licensed local builder you are matched with handles design, engineering, permitting with your jurisdiction, and construction. You contract with the builder directly. We do not build, design, or pull permits.

What to consider before you start

• Your jurisdiction sets the allowed size, height, and setbacks. Confirm the current rules for your lot.
• Lot size, slope, trees, and access affect what is buildable and the cost.
• Utility connections (water, sewer or septic, power) are a major cost driver for a detached unit.
• The Washington 2023 ADU law, HB 1337, changed several local rules. See our HB 1337 guide.