By MBAKS Senior Policy Analyst Allison Butcher

Housing inventory for sale fell between September and October to 1.74 months’ supply in King County and 1.51 months’ supply in Snohomish County. In both counties, this is down from a year ago. Meanwhile single-family and multifamily building permits were down 6% in the Seattle Metro Area (including King, Snohomish, and Pierce counties) in September compared to the same period last year.

The Builder's Bulletin is intended to provide a convenient way to track housing in our market and includes information from the Northwest Multiple Listing Service, State of the Cities Data Systems, Office of Financial Management and the Washington State Employment Security Department.

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Contact: data@mbaks.com

Housing Production Slows Across the Seattle Metro Area

Building activity across the Seattle metro has cooled this year. As of August, 4,390 single-family homes and 4,770 multifamily units have been permitted—representing year-over-year declines of 5% and 26%. In Seattle, 406 single-family and 1,700 multifamily permits have been issued to date.

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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.