Project Information

Bid Title

ADUniverse 2.0: Pre-approved plans for ADUs and middle housing

Issuing Agency

City of Seattle

Location

Washington

Published Date

May 12, 2026

Closing Date

Jul 3, 2026

Government Level

State & Local

Status

Closed

Ref. #

2025-061

Original Source

Join to Access Full Details

Bid Inquiries

Join to Access Full Details

Bid Documents

Join to Access Full Details

Project Description

Project ID: 2025-061

Title: ADUniverse 2.0: Pre-approved plans for ADUs and middle housing

Addenda: 0

Release Date: 5/12/2026

Due Date: 7/3/2026

Follow

ADUniverse 2.0: Pre-approved plans for ADUs and middle housing

Request For Qualification

Office of Planning and Community Development

Project ID: 2025-061

Release Date: Tuesday, May 12, 2026

· Due Date: Friday, July 3, 2026 11:59pm

Posted Tuesday, May 12, 2026 11:22am

All dates & times in Pacific Time

Draft Response Events RSVP No Bid52 days, 5 hours, 42 minutes

Post Information

Posted At:Tue, May 12, 2026 11:22 AM
Sealed Bid Process:No
Private Bid:No

Overview

Summary

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.

Background

In January 2026, new legislation took effect for residential areas in Seattle that expands options for accessory dwelling units (ADUs) and other middle housing types. As required under Washington House Bill 1110, all residential properties can now have at least four homes, with greater flexibility for how these homes are designed, configured, and sold. These changes primarily affected Seattle’s Neighborhood Residential (NR) zoning, which has been updated with new standards (see Seattle Municipal Code Chapter 23.44 or this summary of key changes).

We enter this new chapter of housing in Seattle following several years of growth in the production of ADUs after liberalizing our ADU rules in 2019 and launching ADUniverse in 2020. From 2021 to 2025, the City issued permits for nearly 1,000 ADUs each year, a fourfold increase over pre-2019 activity and evidence of high demand for housing choices in residential areas near parks, schools, and quiet, safe streets. Among other resources, ADUniverse includes a gallery of pre-approved ADU plans that offer a faster and more predictable permitting pathway. Since 2020, several hundred permits have been issued for these pre-approved plans.

To support implementation of new NR zoning, catalyze creation of middle housing, and boost housing production, the City of Seattle is updating ADUniverse with a refreshed and expanded catalog of pre-approved plans that reflect the diverse typology of middle housing now allowed throughout our residential zones.

Timeline

Solicitation Release:

May 12, 2026

Pre-Submittal Conference (Non-Mandatory):

May 21, 2026, 11:00am

https://events.gcc.teams.microsoft.com/event/a2c36958-ee68-4e07-bdc1-7655cad9b91a@78e61e45-6beb-4009-8f99-359d8b54f41b

Deadline for Questions:

May 22, 2026, 5:00pm

Response Submission Deadline:

July 3, 2026, 11:59pm

Interviews if Conducted (estimated):

Add date range

Commodity Codes

• NAICS 236220Commercial and Institutional Building Construction
• NAICS 541611Administrative Management and General Management Consulting Services

* Disclaimer: Government BidHub provides information on bids, RFPs (Requests for Proposals), and RFQs (Requests for Qualifications) solely for convenience and informational purposes. This site is not an official public notice board. For official details, responses, or inquiries, please contact the relevant government agency directly.