Sample ADU

Accessory Dwelling Units

Accessory Dwelling Units (ADUs) are small, independent residential units located on the same lot as a stand-alone single-family home. ADUs provide the same essential functions as a typical single-family residence, complete with a kitchen, sleeping area, and bathroom facilities, but are smaller or “accessory” to the primary residence.

The local jurisdiction’s development regulations determine the exact definition of an ADU and its associated provisions. In other words, requirements for eligibility, location, size, and design in Renton might differ from what is allowed in neighboring cities. In Renton, we allow detached ADUs up to 1,000 sq. ft. These ADUs can be a new detached structure or by converting an existing accessory building, such as a garage.

In short, ADUs are:

  • Accessory dwellings that share a lot with a single-family home.

  • Significantly smaller than the average home in the United States, typically ranging from 400 – 1,000 sq. ft.

  • Flexible housing options that create opportunities for aging adults who want to “age in place” and for others who want the option of living in a smaller space.

  • Ideal are deal for multi-generational households, allowing family members to live on the same property but in separate living spaces.

The city has developed pre-approved ADU plans which will allow for expedited review and significant cost savings for applicants through the city’s Permit Ready ADU (PRADU) program.

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