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Commission backs zoning change to limit size and materials of accessory buildings
Summary
The Planning & Zoning Commission recommended approval of a text amendment to §405.460 that limits detached accessory building footprint to 50% of the primary residence, requires matching exterior materials for detached structures of 400 sq ft or larger, and clarifies height rules; the change moves to City Council for final action.
The Creve Coeur Planning & Zoning Commission on Feb. 18 voted to recommend that City Council amend §405.460 of the zoning ordinance to set new limits and design standards for detached accessory buildings in single‑family residential districts.
Staff said the amendment would cap any single detached accessory building at 50% of the main house footprint and require that detached accessory buildings of 400 square feet or larger use exterior materials similar to the primary structure. The proposal also clarifies height standards so that a detached accessory structure cannot be taller than the principal residence; certain zoning districts retain a maximum allowed accessory height (12 or 15 feet) subject to that overall limit.
Jason Jagievert, director of community development, said the 50% cap replaces a prior 60% proposal after council feedback and that the 400‑square‑foot threshold was chosen because it roughly equals a 20‑by‑20 two‑car garage. He explained the height is measured from average existing grade and that the amendment aims to keep detached structures visually subordinate to houses.
Commissioners discussed edge cases, such as lots with steep slopes or corner‑lot setbacks, how height would be calculated, and the policy tradeoffs related to accessory dwelling units. Following discussion, the commission motioned and voted to forward a positive recommendation to City Council with a minor editorial correction to the total‑height sentence.
The ordinance amendment will go to City Council for final action. Staff said council members had previously reviewed earlier iterations and that the council will continue reviewing the language as it advances through its process.
