Commission backs code changes tightening retaining‑wall standards, inspection and submittal requirements

City engineer Vinsoke Hogue presented a comprehensive rewrite of the city's retaining‑wall construction standards (Municipal Code 17.61.30) intended to address safety gaps and clarify permit triggers. The new approach differentiates prescriptive gravity walls (decorative boulder/timber walls up to 4 feet) from engineered retaining walls; Hogue said engineered design and geotechnical review would be required for anything over 4 feet or for walls with surcharge loading.

Hogue summarized major changes: walls under 4 feet with no surcharge remain permit‑exempt, walls with surcharge must be engineered, building permits will be tied to risk, tiering distances are increased to two times wall height to reduce surcharge interactions, mechanical stabilized earth walls will have stricter submittal and inspection requirements, and the code clarifies how walls near property lines and public utility easements are handled. "Those can only be up to 4 feet tall. And then an engineered retaining wall is anything over 4 foot tall has to now be, engineered," Hogue said. He also noted the proposed new maximum for commercial, industrial and multifamily engineered walls would be 10 feet with appropriate engineering and inspections.

Commissioners asked technical questions about the meaning and application of 'surcharge' and inspection triggers; staff said engineers and inspectors will apply professional judgment and that the code includes definitions and inspection authority. Commissioner DeCourcy moved to forward a positive recommendation to council; Commissioner Strong seconded and the motion passed 5–0. The suggested code rewrite will now be transmitted to City Council for consideration.