Franklin County, KY Building Setbacks & Zoning: Lot Coverage Limits (2026)

Lot coverage in unincorporated Franklin County, Kentucky is set district by district in the zoning chapter adopted by the Fiscal Court as Ord. 8 on 10-23-1987. For the RB Rural Residential B District, § 155.138(D) lists the Bulk, density and height standards: Minimum lot area 9,000 sq. ft., Minimum lot frontage 65 ft., Minimum front yard 25 ft., Minimum street side yard 15 ft., Minimum side yard 8 ft., Minimum rear yard 25 ft., Maximum lot coverage 25% and Maximum height 35 ft. RB is a medium density single dwelling district that requires a full range of community facilities, including public sewers or approved sewage treatment facilities.

The percentage rises as lots shrink and density grows. RR Rural Residential (§ 155.136), the very low density district with 1-1/2 acre minimum lots, prints Maximum lot coverage 10%. RA (§ 155.137) prints 20% on a 15,000 sq. ft. minimum lot. RC (§ 155.139) prints 30% on a 6,000 sq. ft. minimum lot, and RD Rural Two Dwelling (§ 155.141) also prints 30%. The RS Special Residential District (§ 155.140) prints 40%.

The tables use the term lot coverage and the code text read for this page does not define it as impervious surface, so the percentage is the figure to apply, not a separate impervious limit. The AG Agricultural District table in § 155.135(E) has no lot coverage row, and § 155.135(G) says land used solely for agricultural purposes has no building permit, certificate of occupancy, height, yard, location or courts requirements for agricultural buildings. Relief from a district table goes to the Board of Zoning Adjustments.