Permit Ready ADU Program

Accessory Dwelling Unit (ADU)

Sometimes referred to as mother-in-law unit, granny shack, or backyard cottage, 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, but are smaller or "accessory" to the primary residence.  For more information, view the Accessory Dwelling Unit Handout.

The Puget Sound region continues to face significant challenges related to housing supply and affordability. State and municipal legislation continue to advance Accessory Dwelling Units (ADUs) as one way to create affordable housing options, diversify existing housing stock, and control sprawl.

To promote ADU development, the City developed a Permit Ready ADU (PRADU) Program that offers residential property owners to select from eight pre-approved, designed, and engineered ADU model base plans.  The model base plan range in size from 415 - 1,000 sq. ft. and vary in architectural styles so that property owners can select an ADU that is complementary to the existing single-family dwelling.

City of Renton Permit Ready ADU (PRADU) Program

The City is offering free ADU model base plans for residential property owners within the City's jurisdictional boundary. The model base plans and PRADU Program was designed to simplify the building permit application and review process. Applicants utilizing the City's pre-approved plans will work with staff one-on-one to design their ideal site plan and go through an expedited review process, providing the applicant with significant cost savings that can be applied toward construction.

Interested in applying for a PRADU? Please email Planning Customer Service for more information or call (425) 430-7294.

After working with our Planning Customer Service, you will be able to submit for a PRADU through the Online Permit Center.


PRADU Architectural Designs

Each floor plan has been designed with several different architectural styles to match your existing home.  Click through the drop downs below to take a look at the 22 unique models to choose from! Ask planning customer service about slab on grade models that are available.  More detailed information will be available in a PRADU Lookbook and when working with Planning Customer Service.


Adams : 1 Bed / 1 Bath, 520 sqft

Adams Models1 story structure
Bedrooms: 1
Bathrooms: 1

 




Baker : 1 Bed + Loft / 1 Bath, 418 sqft

Baker Models1 story with loft structure
Bedrooms: 1
Bathrooms: 1

Cascade : 2 Beds / 1 Bath, 650 sqft

Cascade Models1 story structure
Bedrooms: 2
Bathrooms: 1

Olympics : 2 Beds / 1 Bath, 602 sqft

Olympics Models2 story Carriage House
Bedrooms: 2
Bathrooms: 1

Helens : 2 Beds / 1 Bath, 624 sqft

Helens Models2 story Carriage House
Bedrooms: 2
Bathrooms: 1

Hood : 3 Beds / 2 Baths, 989 sqft

Hood Models1 story structure
Bedrooms: 3
Bathrooms: 2

Open House Video for PRADUs

The city held an open house on April 24, 2021, to introduce the program.

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