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Mountlake Terrace planning commissioners review engineering manual updates; staff to recommend council action
Summary
City staff presented proposed changes to the Engineering Development Manual and related municipal code updates — including new stormwater billing for ADUs, clarified driveway and driveway-approach standards, a three-year stormwater lookback, and narrower local street cross-sections — and recommended forwarding the package to the City Council for review.
The Mountlake Terrace Planning Commission on Dec. 22, 2025 reviewed proposed updates to the city’s Engineering Development Manual (EDM) and related sections of the Mountlake Terrace Municipal Code and heard staff’s recommendation to forward the package to the City Council for action.
Lucas Crot, who presented the EDM and accompanying code changes, told commissioners the packet had been distributed later than planned and that this session was intended as a high-level review. "Staff recommend we recommend approval to the planning or to city council," Crot said, and outlined a schedule that includes additional commission review on Jan. 12 and Council consideration in the first quarter of 2026.
Why it matters: staff said the changes are intended to remove outdated or conflicting regulations, consolidate standards into a single reference (MTMC chapter references to the EDM), and clarify application thresholds so applicants and staff rely on consistent criteria. Key proposed changes highlighted in the presentation would affect driveways, street dimensions, stormwater billing and permitting thresholds.
Major proposed changes and details
- ADU stormwater billing: The draft would define accessory dwelling units (ADUs) as one-half of an Equivalent Residential Unit (ERU) for stormwater…
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