FOR IMMEDIATE RELEASE
Media Contact:
Sharon Couts
Master Builders Association of King and Snohomish Counties
425.499.1723

Master Builders Association Hires Kathleen Sims, Former Weyerhaeuser Executive, as its New Executive Director

Bellevue, Wash—March 1, 2018—The Master Builders Association of King and Snohomish Counties (MBAKS) announced the selection of Kathleen (Kat) Sims as its new executive director. Sims is the first woman to lead the association in its 109-year history. As the former vice president of environmental affairs, sustainability, and corporate responsibility of Weyerhaeuser Company, she is an influential leader accustomed to the building industry. She begins her new role Monday, March 5.

“Kat’s depth and breadth of experience as an executive, real estate attorney, and coalition builder will be a tremendous asset for our association,” said Erich Armbruster, the association’s board president. “She will be an excellent representative for Master Builders Association as we expand our influence with regional leaders in addressing the growth and critical housing issues facing our region. I could not be more pleased that such an exceptional leader is taking the helm.”

Sims is a seasoned attorney specializing in real estate law, with more than 10 years of in-house business management expertise. Prior to her most recent position at Weyerhaeuser, Sims worked as vice president of government affairs at Plum Creek Timber Company Inc., which merged with Weyerhaeuser in 2016. She also served as senior director of sustainability and senior director, real estate law at Plum Creek. Early in her career, Sims was a partner at Alston, Courtnage & Bassetti LLP and an associate attorney at Foster, Pepper & Shefelman LLP (now Foster Pepper), where she provided strategic legal advice to developers, landowners, and lenders.

“Developing adequate housing is vital to the health of our region and the Master Builders Association needs to be at the table as discussions are made that impact housing availability,” said Sims. “I’m looking forward to forging new partnerships and locking arms with the association’s leadership, members, and staff to help solve critical issues affecting our communities.”

“Having an opportunity to engage an experienced leader with Kathleen’s credentials is a terrific outcome for our association,” said Mike Walsh, MBAKS 2017 board president and head of the executive search committee.  “Kat has sound judgement and common sense and will be an effective voice for Master Builders Association.”

About MBAKS

Founded in 1909, the Master Builders Association of King and Snohomish Counties has grown to become the largest residential homebuilders association in the United States. With nearly 3,000 member companies, the association is dedicated to membership value, housing advocacy, community service, and financial stewardship throughout the Puget Sound region.

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MBAKS joined Governor Ferguson as he signed HB 1096 into law.

Big news for housing in Washington: Governor Bob Ferguson has signed HB 1096 into law, legalizing residential lot splitting across the state. After three years of advocacy, this landmark reform creates a straightforward, administrative process for homeowners and homebuilders to divide a single lot into two—unlocking small-scale infill, expanding homeownership, and creating new paths to affordability.

For decades, Washington law required homeowners and builders to navigate complex, costly subdivision processes that could take years—even when the existing lot already met zoning and infrastructure standards. HB 1096 finally fixes that, allowing qualifying lots to be split without major red tape, and enabling cities to review building permits alongside lot split applications.

Lot splitting won’t just create more homes—it will also allow aging homeowners to age in place, help families build wealth through multigenerational housing, increase opportunities for supplemental income, and offer first-time buyers access to starter homes in high-opportunity neighborhoods. It complements recent reforms like HB 1110 (middle housing) and supports the Growth Management Act’s goals by enabling gentle infill where it’s needed most.

HB 1096 ensures accountability by requiring clear, objective standards, displacement mitigation, and infrastructure availability before approval. Cities must implement the new policy by 2027 (or within two years for non-GMA jurisdictions), and guidance is expected from the state Department of Commerce later this year.

This is a major step toward restoring affordability and giving everyday Washingtonians more options to stay, build, and invest in their communities—one lot at a time.

View MBAKS Lot Splitting Brief for more information: Creating More Housing Through Lot Splitting.

Contact: data@mbaks.com

In September 2024, Washington's unemployment rate stood at 4.8%, with the Seattle/Bellevue/Everett area slightly lower at 4.4%. Between September 2023 and September 2024, construction employment in the state saw a boost, adding 4,700 jobs, bringing the total to 236,600.

Read the full October Builders Bulletin