A retaining wall over four feet tall, measured from the bottom of the footing, needs a building permit and engineered design under Washington's building code. Benton County reviews taller and surcharged walls; shorter unloaded walls are exempt.
Retaining walls in Benton County follow the Washington-adopted International building codes, applied through the county building division. A wall four feet or less, measured from the bottom of the footing to the top, and not carrying a surcharge such as a slope or driveway above it, needs no permit. A taller wall, or any wall bearing a surcharge, requires a building permit and usually a licensed engineer's design. Zoning setbacks still apply, and on the county's sandy Columbia Basin soils and river bluffs, walls that redirect stormwater or destabilize a hillside create civil liability and may trigger grading review.
Building a regulated retaining wall over four feet without a permit can draw a stop-work order, require engineering and a retroactive permit, or an order to correct or remove it.
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