Pierce County, WA Fence Regulations: Retaining Walls (2026)
Key Facts
- Permit-exempt height
- 4 feet or less, footing to top of wall
- Exemption void if
- Wall supports a surcharge (added load)
- Governing section
- PCC 17C.30.040, amends IRC Section R105.2
- Misdemeanor penalty
- Up to $1,000 fine or 90 days jail
- Civil penalty
- Up to $1,000 per violation, per day
- Appeal window
- 14 days to Building Official/Hearing Examiner
Summary
A retaining wall in unincorporated Pierce County needs no building permit if it stands four feet or less, measured from the bottom of the footing to the top of the wall, and does not support a surcharge, under PCC 17C.30.040. Anything taller, or any wall carrying extra load behind it, must go through the standard building permit process under Chapter 17C.10 PCC, including plan review and inspection.
Section R105.2 of the International Residential Code is amended as follows: 3. Retaining walls that are not over four feet (1219 mm) in height measured from the bottom of the footing to the top of the wall, unless supporting a surcharge. ... Exemption from the permit requirements of this Code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this Code or any other laws or ordinances of Pierce County.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 2026-515, and legislation passed through May 26, 2026).
Full Breakdown
2 of the International Residential Code for Pierce County and lists 15 categories of work exempt from a building permit; retaining walls are item 3. The exemption applies only when the wall is not over four feet (1,219 mm) tall, measured from the bottom of the footing to the top of the wall, and only if the wall is not supporting a surcharge, meaning added load behind it. 070. 040 closes by stating that an exempt wall still must meet every other Pierce County law, including the fence and retaining-wall height limits within setbacks under Title 18A PCC and any applicable critical-areas rules under Title 18E PCC where the wall sits near a wetland, stream, or steep slope.
050 let a developer avoid setting a fill or cut slope back from a property line if a professional engineer designs and constructs a retaining wall for the project instead. Because a permit-exempt retaining wall is still subject to every substantive Pierce County requirement, a homeowner who builds a four-foot wall without checking setback or critical-area rules can still be cited even though no building permit was ever required for the wall's height.
Violations & Fines
Building a retaining wall over four feet, or one supporting a surcharge, without a permit is unlawful under PCC 17C.10.050.A and can be charged as a misdemeanor: up to a $1,000 fine, 90 days in jail, or both, with each day of continued work a separate offense under PCC 17C.10.050.D.1. The county can also impose a civil penalty up to $1,000 per violation under PCC 17C.10.050.D.4, appealable to the Building Official within 14 days.
Frequently Asked Questions
Do I need a permit for a retaining wall in Pierce County?
What happens if I build a retaining wall over four feet without a permit?
Can I appeal if Pierce County requires a permit for my retaining wall?
Sources & Official References
Other rules in Pierce County
Compare Pierce County to another location·View the Washington fence regulations overview
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