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Staff outlines state middle-housing lot-division rules and pending changes; commission raises water and infrastructure concerns
Summary
Planning staff briefed commissioners on Senate Bill 458 middle-housing lot divisions (MHLDs) and recent amendments in House Bill 2138 that allow local discretion on accessory dwelling units; commissioners asked about infrastructure, SDCs, water supply and how new rules will be implemented locally.
Planning staff told the commission on Oct. 8 that state law requires cities to allow middle‑housing lot divisions (MHLDs) for certain housing types and summarized a July 2025 amendment that affects accessory‑dwelling‑unit (ADU) allowances.
Staff explained that Senate Bill 458 (often referenced by staff as SB 458) requires jurisdictions to permit lot divisions that enable individually owned ownership of middle‑housing units — duplexes, triplexes, quadplexes, townhomes and cottage clusters — when the development otherwise meets the state’s middle‑housing construction and land‑use requirements. The presenter noted that SB 458 applies to MHLDs permitted on or after June 30, 2022 and…
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