Lexington, KY Building Safety: Fire Sprinkler Requirements (2026)

Section 5-5's restrictions for District 1, the inner fire zone, state that no building or structure of frame, ordinary, heavy-timber or unprotected limited-combustible construction may be increased in height or remodeled unless a sprinkler system is added, and that no such building may be extended on any side unless the extension conforms to the Code's new-construction requirements, with the addition itself also triggering the sprinkler-system requirement if it increases the building's size or involves remodeling. The rule sits alongside a related restriction that a frame or unprotected-metal building cannot be moved into the inner fire limits, or from one location to another within them, and a building counts as being inside the inner fire limits once more than a third of its floor area sits within the described boundary.

The inner fire zone runs through downtown Lexington along a metes-and-bounds description anchored on West High Street, the Jefferson Street Viaduct, West Main Street and North Limestone, so the sprinkler trigger applies specifically to older frame and heavy-timber buildings being expanded or remodeled in that historic core rather than to construction city-wide. Section 5-29's fee schedule separately prices fire-suppression system plan review, from one hundred fifty dollars for four to twenty-five sprinklers up to three hundred seventy-five dollars plus thirty cents per head above seven hundred fifty, a fee owners triggering this sprinkler mandate should expect to pay alongside the building permit itself.