Building Setbacks & Zoning in Franklin County, WA (2026)
3 rules for unincorporated Franklin County, Washington.
Verified from official government sources
Setback Rules
In the AP-20 agricultural production zone of unincorporated Franklin County, primary buildings must sit at least 25 feet from the road right-of-way, or 55 feet from the road centerline (whichever is greater), 10 feet from each side lot line, and 25 feet from the rear lot line.
Yard Setbacks in Franklin County's AP-20 Zone
Some RestrictionsFranklin County Code § 17.10.050(C)
C.Minimum Yard Setbacks (Primary).1.Front. No building shall be located closer than twenty-five (25) feet from a road right-of-way, or fifty-five (55) feet from the centerline of the adjoining road or whichever is greater.2.Side. There shall be a side yard of not less than ten (10) feet in width on each side of a building, providing that the side yard on a corner lot shall not be less than twen...
Structure Height Limits
Franklin County caps primary and accessory structures at 35 feet in the AP-20 agricultural production zone, but exempts barns, silos, water towers and other farm buildings from the height limit entirely, along with chimneys, towers, aerials and flagpoles not meant for human occupancy.
Building Height Limit in Franklin County's AP-20 Zone
Some RestrictionsFranklin County Code § 17.10.050(E)
E.Height: thirty-five (35) feet (primary and accessory). Height limitations shall not apply to barns, silos, water towers or other farm buildings and structures. Projections such as chimneys, domes, spires, elevator shaft housings, towers, aerials, flagpoles, and other similar objects not used for human occupancy are likewise not subject to height limitations of this chapter.
Lot Coverage Limits
In the RR-1 rural residential zone of unincorporated Franklin County, buildings and structures may cover no more than 40 percent of a one-acre minimum lot. RR-5 rural residential lots carry the identical 40 percent cap, while the AP-20 and AP-40 agricultural zones set no coverage limit at all.
Max Lot Coverage in Franklin County Zones
Some RestrictionsFranklin County Code § 17.14.050(C)
In the rural residential 1 zone, the following dimensional standards shall apply: ... A.Minimum lot area: one acre.B.Density: one dwelling unit per lot/parcel.C.Maximum lot coverage: forty (40) percent.
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