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Commission backs uniform ADU size limits, considers 600-sq-ft by-right and SUP up to 1,500
Summary
Commissioners discussed aligning ADU square-footage allowances across zoning districts and proposed a framework of 600 sq ft allowed by right with an SUP pathway to reach 1,500 sq ft; staff will draft ordinance language and return for a public hearing.
Commissioners debated whether ADU size limits should vary by zoning district or be standardized citywide. Staff noted previous rules set different caps by district (R1, R1.5, R2), and the draft under review would make the same caps apply across districts. Joe Hilborn summarized the proposed standardization: "Specific regulations for ADU square footage based on zoning district is 600 square feet still allowed by right with a maximum of 1,500 square feet in any zoning district." (Joe Hilborn)
Several commissioners favored a two-tier approach: a modest unit permitted by right (discussed as 600 sq ft) with an SUP review for larger standalone accessory buildings up to 1,500 sq ft. One commissioner summarized the compromise: "600 by right and 601 to 1,500 by SUP." That approach is intended to allow modest expansions while reserving discretionary review for larger structures that could affect neighbors.
Staff also recommended clarifying which ancillary areas count toward the square-foot calculation (closets, porches, utility spaces, covered vehicle storage), and commissioners asked staff to include ‘‘utility spaces’’ and similar areas to align with IRC definitions. The item will be redrafted and returned as a public hearing.
