ADU and middle housing pre-approved design plans
ADUniverse 2.0: Pre-approved plans for ADUs and middle housing, Solicitation 265217, issued by City of Seattle.
At a glance
Seattle is seeking pre-approved architectural designs for accessory dwelling units and middle housing to feature on its ADUniverse 2.0 website. Architects, designers, and homebuilders can submit up to three designs that meet Seattle's residential zoning criteria; submissions close July 16, 2026.
Key facts
- Issuing agency
- City of Seattle
- Solicitation number
- 265217
- Type
- purchase
- Posted
- May 12, 2026
- Response deadline
- Jul 16, 2026, 2:59 AM EDT
- Pre-bid meeting
- May 21, 2026, 2:00 PM EDT
- Place of performance
- King County, WA
Official description
Solicitation #2025-061. Issued by Office of Planning and Community Development. The City of Seattle is updating its ADUniverse website with new pre-approved plans for accessory dwelling units (ADUs) and middle housing now allowed throughout Seattle's residential zones. We invite designers, architects, and homebuilders to submit ADU and middle housing designs that fulfill the criteria and follow the requirements outlined in our Submission Guide. We welcome multiple submissions. After entering information for the first submission, it will ask if you have a second one (and, after that, if you have a third). This form will accept up to three submissions. If you wish to submit more than three designs, package the information as a PDF and send it to (on the official posting). Submissions on OpenGov ask for an employee identification number (EIN). Individuals submitting a design who do not have an EIN should enter their SSN in that field. For technical issues with this form, email (on the official posting).
Respond to this bid
This solicitation is administered by the issuing agency through its OpenGov procurement portal. The official documents, any addenda and updates, and the procurement officer’s contact information are all posted there, and bid submission happens there, not on SledAtlas.
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