Permit Ready ADU Program

What is an 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 are 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 Civic Access Self-Service Portal.

PRADU Architectural Designs

Available models are displayed in the drop-down menus below. The floor plans are online.

More information and the PRADU Lookbook are online.

Looking for a Contractor to build your PRADU?

Property owners/applicants have the right to hire any qualified, licensed professional for the purposes of PRADU construction, but as requested by PRADU applicants, we have compiled a list of contractors with knowledge and interest in the PRADU Program. The companies listed here have self-certified that they are familiar with the City of Renton PRADU Program. The PRADU Program Professional Services Roster is open by request, and the City does not endorse, recommend, or have any involvement in selecting professionals.

PRADU Professional Services Roster (to view the list, click the link and when the page opens click the down arrow next to the printer icon to download the spreadsheet)

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

Glacier: 3 Beds / 2 Bath, 1,000 sqft

Glacier Models2 story structure
Bedrooms: 3
Bathrooms: 2

Enchantment: 2 Beds / 1.5 Bath, 800 sqft

Artist's Drawing of Enchantment2 story structure
Bedrooms: 2
Bathrooms: 1.5

Olympics: 2 Beds / 1 Bath, 602 sqft

2 story Carriage HouseOlympics ADU Model Image
Bedrooms: 2
Bathrooms: 1

Helens: 2 Beds / 1 Bath, 624 sqft

2 story Carriage HouseHelens ADU model image
Bedrooms: 2
Bathrooms: 1

Townsend: 3 Beds / 2 Baths, 989 sqft

1 story structureHoods ADU model image
Bedrooms: 3
Bathrooms: 2


Permit Ready ADU Program Professional Services Roster Sign-Up

Any professional or company wanting to be added to the Permit Ready ADU (“PRADU”) Program Roster may complete the form below. Any entity may submit their information to self-certify that they are familiar with the City of Renton’s PRADU Program.

The property owner reserves the right to hire any qualified licensed professional for the purposes of PRADU construction. The PRADU Program Professional Services Roster is open to all professionals by request, and the City does not endorse, recommend, or have any involvement in selecting professionals.

When completing the form, please provide your industry/profession, business name, preferred contact information, and business license number.

By checking the button below and submitting this form, I confirm that I have watched the PRADU online open house video posted on the PRADU webpage and am familiar with the PRADU program and its processes.

 I confirm I watched the PRADU open house video

I understand the City of Renton does not vet these requests and therefore does not endorse, recommend, or have any involvement in selecting professionals. I understand applicants are not required to hire from this list and reserve the right to hire any qualified licensed professional. If you have any questions or concerns, please contact [email protected].

Industry/Profession (REQUIRED) For example, construction, financial institution, arborist, contractor, geotechnical engineer, etc. 

Business Name (REQUIRED)

Street Address


Telephone (REQUIRED)

Renton Business License (REQUIRED)


Provide additional information related to your profession, experience, area of expertise, etc. (Maximum 255 characters)

Security Measure

Open House Video for PRADUs

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


Innovative PRADU program wins King County VISION 2050 award

Photo of the award prsentation
Mayor Armondo Pavone accepts the VISION 2050 Award from the Puget Sound Regional Council Executive Director Josh Brown. They are joined by Renton Planning Commission members, city Community & Economic Development staff, and city councilmembers.

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