Port Townsend, WA Fence Regulations: Retaining Walls (2026)
Key Facts
- Structure threshold
- Retaining wall 4 feet or taller
- Permit trigger
- Walls over 4 ft may need a permit
- Adopted building code
- International Building Code (PTMC 16.04.020)
- Reviewing department
- Planning and Community Development (PCD)
- Enforcement
- PTMC 16.04.100 / Chapter 1.20 penalties
Summary
Port Townsend's zoning code exempts retaining walls under four feet from structure regulations; at four feet and taller, a wall becomes a regulated structure and needs a building permit under the city's adopted building code.
“Structure” means a combination of materials constructed and erected permanently on the ground or attached to something having a permanent location on the ground. Not included are residential fences less than six feet in height, common roof-top residential television antennas, retaining walls less than four feet in height, rockeries and similar improvements of a minor character less than three feet in height.
“Structure, historic” means any structures individually listed on the National Register of Historic Places, or identified as pivotal, primary, or secondary on the map which accompanied the certification of the Port Townsend National Register Historic District on May 17, 1976.
“Structure, nonhistoric” means any structure not identified as an “historic structure” pursuant to this section.
“Subdivision, unit lot” means a subdivision process by which boundary lines and use areas are defined within a larger “parent” lot to establish individual sellable lots, allowing for the creation of fee simple lots for attached homes or subdivisions comprised of both attached and detached homes.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 3364, passed May 18, 2026).
Full Breakdown
PTMC 17.08.060 defines 'structure' to exclude retaining walls under four feet, rockeries under three feet, and fences under six feet: a taller retaining wall counts as a regulated structure citywide, not just in commercial or park zones. The commercial (PTMC 17.20.030) and public/park (PTMC 17.24.030) bulk tables spell out the consequence directly: fences over six feet and retaining walls may require a building permit. Port Townsend adopts the International Building Code through PTMC 16.04.020, and the Department of Planning and Community Development reviews the permit application; a wall over four feet or holding back a surcharge needs a stamped engineered design.
Violations & Fines
Building without a required permit is enforced by the PCD director under PTMC 16.04.100, subject to Chapter 1.20 PTMC abatement, civil, and criminal penalties.
Frequently Asked Questions
Does a short retaining wall need a permit in Port Townsend?
What height triggers a building permit for a retaining wall?
Who reviews retaining wall permits in Port Townsend?
Sources & Official References
Other rules in Port Townsend
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