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Planning staff outlines adopted administrative-exception rules and new accessory-structure limits
Summary
Planning staff reviewed administrative-exception language and new accessory-structure and setback rules adopted in 2024, explaining measurement methods, notification procedures, and maximums including a 5,000-square-foot per-structure cap and a 25-foot height limit for detached accessory structures in residential zoning districts.
Linn County planning staff briefed the Board of Adjustment on administrative-exception language and recent changes to accessory-structure limits and setbacks that the county adopted in 2024.
Staff said the newly adopted administrative-exception process allows the zoning administrator or designee to grant small deviations from bulk standards — such as front, rear, corner side or side yard setbacks, lot frontage, accessory-structure sizes, building heights and sign limitations — provided the request meets defined thresholds and is not otherwise prohibited. The process includes notification to contiguous property owners; staff will mail notice and wait 10 business days for comments. If contiguous property owners file written consent the administrator may issue the exception sooner; written protests will block issuance and the applicant may pursue a special exception or variance with the Board of Adjustment.
Staff also reviewed changes to setbacks and detached-accessory-structure limits. For agricultural and critical-natural-resource districts the rear yard setback was changed from 50 feet to 35 feet. For rural residential districts, front, corner and rear yard setbacks were set at 35 feet. Detached accessory-structure size limits for residential zoning districts are now based on maximum lot coverage and are cumulative across all detached accessory structures; the rules exclude principal structures, ground-mounted solar arrays, roads, driveways, parking lots and swimming pools from the accessory-structure lot-coverage calculation. There is a per-structure cap of 5,000 square feet for detached accessory buildings in residential districts; accessory dwelling units remain limited to 1,200 square feet. Staff said there is no lot-coverage limitation for residential parcels of 3 acres or greater, but the 5,000-square-foot per-structure cap still applies.
Staff clarified measurement rules: lot coverage is measured along the outside/exterior wall at ground level as viewed from above; the first two feet of a roof overhang are excluded from the calculation. Height for detached accessory structures is limited to 25 feet and is measured per the county definition in the code. Planning staff said the building official was consulted in drafting the changes and that staff will monitor applications and adjust the rules if implementation issues emerge.
Board members raised questions about language that uses "or" and "and/or" in one table and about how the lot-coverage and structure-footprint provisions interact. Staff said the language as adopted is being enforced and that the board may send written comments for staff to consider; staff recommended addressing any interpretive issues at the staff level and bringing changes to the Planning Commission and Board of Supervisors if revisions are necessary. No formal board action occurred; the briefing was informational.
Staff encouraged board members to submit written detailed comments if they had concerns about interpretation so staff can consider changes and, if appropriate, propose amendments through the Planning and Zoning Commission and Board of Supervisors.
