Renton Unveils Permit-Ready Program To Construct Accessory Units

RENTON, WA — Renton homeowners will soon be able to build accessory dwelling units, sometimes called "mother-in-law apartments," on their properties, with minimal fees and a streamlined permitting process under a new city program.

Renton's permit-ready ADU program is designed to shorten the construction timeline and reduce the barriers to adding more livable space on properties. City officials said they found accessory units to be a viable option to address regional population growth and the increasing demand for housing, providing an easy way to add new residences to existing neighborhoods.

City officials define ADUs as:

• 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.

In finalizing the program, Renton contracted architects to create eight pre-approved design plans that complement the city's existing styles. Designs include single-story and two-story options, and architectural styles like contemporary, Victorian, craftsman and rambler. Each model includes a kitchen, sleeping area and bathroom, along with one to three bedrooms.

In constructing the units, either for family use or to rent out, homeowners can expect most fees to be waived or reduced, including those for building permits and various impact fees.

Homeowners interested in adding an ADU to their property are invited to participate in a virtual open house event scheduled for Saturday, April 24.

Learn more about permit-ready ADUs on the city of Renton website.