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On February 18, Mayor Katie Wilson signed CB 121093 and CB 121135 into law, streamlining SEPA review for infill residential and mixed-use development citywide. MBAKS staff were invited to attend the bill signing and provide brief remarks — an encouraging sign of early collaboration with the new administration.

The event was recorded by Seattle Channel.

A Strong Start

As Seattle enters a new chapter of leadership, MBAKS is focused on partnering to create productive, solutions-oriented outcomes. Being included in this milestone reflects the ongoing dialogue between our association and the Mayor’s Office around housing supply, affordability, and regulatory modernization.

Housing outcomes improve when policymakers and housing providers work together. Early engagement helps ensure policy is practical, predictable, and effective.

What the Legislation Does

CB 121093 exempts qualifying residential and mixed-use development from project-level SEPA review until the City’s residential growth targets are met. After that, fallback thresholds exempt residential projects of up to 200 dwelling units citywide.

The reform reduces duplicative review while maintaining environmental protections already required under Washington’s Growth Management Act and the Shoreline Management Act, along with Seattle’s existing land use and critical areas regulations.

Continuing the Work

MBAKS testified in support of the legislation at the February 4 Land Use Committee hearing and submitted a formal letter of support.

We appreciate the Mayor and Council’s leadership and look forward to continuing our partnership with the administration to advance balanced policies that expand housing opportunities across Seattle.

Making home happen requires collaboration — and this is a strong step forward.

Event part of MBAKS’ ongoing engagement on HB 1110 & HB 1337 implementation

MBAKS recently hosted a Middle Housing Forum focusing on state law changes now being implemented that could transform the housing landscape in our region and state.

The March 25 learn-at-lunch style event drew nearly 100 attendees. It was designed to help MBAKS members navigate the coming changes related to middle housing and accessory dwelling units (ADUs) following the adoption of HB 1110 and HB 1337 in 2023.

Panelists included Lilith Vespier, Infill Housing Manager with the Department of Commerce; Adam Weinstein, Director of Planning & Building for the City of Kirkland; and Ryan Gillis, Founder and CEO of Gillis Real Estate. 

In case you missed it, members can find a copy of the presenters’ PowerPoint slides on our Middle Housing & ADU Resources page, which is part of the Resource Library on MBAKS Connect.

Following panel presentations, attendees also heard brief updates from a handful of other city representatives in attendance from Bellevue, Bothell, Kent, and Lynnwood. Many cities in our two counties are in the process of updating local codes to comply with the new middle housing and ADU state laws. Local jurisdictions have until June 30, 2025 to update their codes.

The forum ended with audience Q&A time. During this open discussion, some members reiterated a point Ryan Gillis made during his presentation--the importance of flexibility in local codes so that builders can better respond to market demand. Another member stressed the importance of ensuring floor area ratios and building heights are properly set so that more project types are feasible to build. 

Members also expressed concerns about affordable housing fees that some jurisdictions are adopting alongside middle housing codes, as they will create unnecessary barriers to adding more housing choices.

MBAKS Executive Director Jerry Hall closed by sharing MBAKS’ overarching suggestion for cities implementing middle housing and ADU changes – “keep it simple.” The easier and more cost-effective it is to build middle housing, the more likely it is to be built, and the more attainable it will be for those looking for a place to call home.

Thanks to all who attended the Middle Housing Forum! To keep up with our advocacy work and changes related to middle housing and ADUs, MBAKS members are encouraged to engage with our Builders Councils.