Marion, OH Building Setbacks & Zoning: Lot Coverage Limits (2026)

Chapter 1151 of the Marion Codified Ordinances sets lot coverage for the office districts. Section 1151.02 says lot size, lot coverage, floor area ratio, yard and building height requirements for all office and institutional districts are set in the sections that follow. The coverage rule itself is one sentence in § 1151.022: principal and accessory buildings together shall not occupy more than 25% of the area of a lot. It counts buildings only. The section says nothing about driveways, parking areas or paving.

Lot size works backward from coverage. Section 1151.021 sets no minimum lot size or dimensions, but the lot must be adequate to comply with the maximum coverage and minimum yard requirements. Intensity is also capped by floor area ratio under § 1151.023: the ratio of floor area to lot area shall not exceed 0.5, rising to 1.0 where an O-I lot adjoins land in the R-3 Multi-family District along 1/2 or more of its total perimeter. Section 1151.03 gives the O-I-A Office-Institutional-Apartment District the same lot coverage requirements as O-I and lets the ratio reach 1.4 for buildings exclusively for elderly housing limited to that use by legally binding agreements or other documents.

Residential districts use a different set of controls. The § 1151.011(A) schedule lists minimum lot size, lot area per dwelling unit, maximum floor area ratio, minimum yards and maximum building height, and § 1159.01(B)(4) separately limits coverage of a rear yard by accessory buildings to 25%.

Coverage is checked at the zoning permit stage. The § 1177.02 application must show the actual shape and dimensions of the lot and the exact location, size and height of each building, drawn to scale, and the Safety/Service Director can require the lot dimensions to be based on an actual survey. For a non-residential project the § 1183.011 permit fee is a minimum of $25.00 plus $1.50 per additional $1,000 or fraction thereof, with a maximum of $1,000.