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Mountlake Terrace council adopts updated Engineering Development Manual and code amendments
Summary
The council unanimously adopted a new Engineering Development Manual and related municipal code updates that change permit thresholds, driveway and street-width standards, and stormwater billing for accessory dwelling units. Council opened a public hearing with no public testimony and approved the ordinance by voice vote.
Mountlake Terrace’s City Council adopted an updated Engineering Development Manual (EDM) and related municipal code amendments on March 5 after a staff presentation and public hearing that produced no testimony.
Lucas Cropp, Civil Engineer II for the city, outlined the principal changes in the 2026 EDM, including defining accessory dwelling units as 0.5 of an equivalent residential unit for stormwater billing and capital facility charges; adding a common-sense permit exemption for up to 2,000 square feet of ground disturbance or 50 cubic yards of material moved; clarifying overhead utility…
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