In the RA Low Density Residential Zone, no main building may exceed 3 stories or 35 feet, and accessory buildings are capped at 18 feet. Farm buildings, chimneys, spires, flagpoles, and similar projections are exempt from the height limits.
Maximum building height is set per district. In the RA Low Density Residential Zone, Section 5.11.11 states no main building shall exceed three stories or 35 feet in height, and accessory buildings shall not exceed 18 feet; the 18-foot cap may be exceeded only to match the pitch of the principal building's roof. Section 3.20.03 exempts certain structures from district height limits entirely, including agricultural buildings, barns, silos, windmills, chimneys, smokestacks, spires, flagpoles, ventilators, and radio, television, and communication towers. A habitable basement or attic counts as a story. Height limits differ in the RB and commercial districts, so check the applicable zone.
Exceeding the height limit violates the Zoning Ordinance, carrying a $10-$500 civil penalty under Section 6.20.02, each day a separate offense; compliance may also be enforced by injunction.
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See how Knox County's structure height limits rules stack up against other locations.
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