Lexington, KY Fence Regulations: Retaining Walls (2026)

LFUCG follows the Kentucky Residential Code as adopted, which generally exempts retaining walls 4 feet or less in height — measured from the bottom of the footing to the top of the wall — from a building permit unless they support a surcharge. A surcharge includes any additional load on the retained soil beyond simple gravity, such as a driveway, swimming pool, parking area, or structure within the influence zone behind the wall. When the wall exceeds 4 feet or supports a surcharge, the property owner must submit engineered design drawings prepared by a Kentucky-licensed professional engineer, obtain a building permit from LFUCG Division of Building Inspection, and schedule inspections during construction. Drainage is critical: retaining walls require proper backfill with free-draining material, weep holes or drain tile behind the wall, and positive drainage so that water does not saturate the retained soil and cause wall failure. Walls near the property line must respect setback and easement rules, and where a wall affects drainage to or from a neighboring property, Kentucky common law on surface water (the modified reasonable use rule) applies. Walls in the public right-of-way require additional approval from LFUCG Engineering. Historic district properties may need design review for visible portions of the wall. Small landscape timbers or decorative masonry under 2 feet generally do not raise engineering concerns but should still be built with proper drainage to prevent future failure.