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The April 2023 population estimates have been released, highlighting a 1.1% growth since April 2022 in Washington. According to estimates from the Office of Financial Management, Washington's total population has surpassed 7.9 million residents, with a total of 4,437,100 just in the Puget Sound region. King County has witnessed the largest influx, with an addition of 30,100 individuals since last April. Snohomish County follows closely with a growth of 12,500 over the same time period.

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The Bellevue City Council has adopted an ordinance implementing residential lot splitting, creating another tool to help increase housing opportunities through more efficient land division. The ordinance was adopted on July 28 as part of a larger package of land use code amendments. MBAKS supported adoption and submitted this July 28 letter to the City Council. 

Bellevue deserves recognition for being one of the first jurisdictions in King and Snohomish counties to implement Washington’s new lot splitting law, HB 1096 (now codified in RCW 58.17.145). The City has taken an important step by establishing a local process and ensuring its code is consistent with the intent of state law. MBAKS also appreciates Bellevue staff's collaborative approach and willingness to work through implementation issues before adoption.

One important caveat is that Bellevue's new residential lot splitting provisions will not take effect until July 27, 2027. The City chose to delay implementation to allow time to establish a new, streamlined permit type and complete the work needed to administer the new process. While MBAKS would have preferred an earlier effective date, we appreciate Bellevue's thoughtful approach to implementation and its commitment to creating a permitting process that is as efficient and user-friendly as possible.

What Is Residential Lot Splitting?

HB 1096, passed by the Legislature in 2025, requires cities planning under the Growth Management Act to allow qualifying residential lots to be administratively divided into two lots without requiring a traditional short plat or subdivision process.

The goal is to create a simpler, faster path to divide eligible residential lots while maintaining local development standards, infrastructure requirements, and environmental protections. Once divided, each lot can be developed consistent with local zoning and the middle housing requirements adopted under state law.

Read the new residential lot splitting provisions: Ordinance 6933 beginning at the bottom of page 37. 

By MBAKS Senior Policy Analyst Allison Butcher

June housing data from the Northwest Multiple Listing Service show a growing inventory of homes for sale, with 1.34 months’ supply available in both King and Snohomish counties. This marks the first time the housing measure has exceeded one month’s supply since September 2020 in King County and May 2020 in Snohomish County. While this moves us toward greater balance in the market, many analysts consider a four-to-six-month level as an indicator of a healthy market.

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