Sparks requires a building permit for retaining walls over four feet, measured from the bottom of the footing to the top, and for any wall supporting a surcharge such as a driveway or slope. Drainage and setbacks apply.
Sparks follows the International Residential Code adopted in Title 15. Retaining walls up to four feet, measured from the bottom of the footing to the top of the wall, need no building permit, while taller walls, or any wall retaining a surcharge load such as a slope, driveway, or structure above, require a permit and engineered plans stamped by a licensed engineer. Drainage behind the wall must be addressed in design. In cooperative-planning hillside areas, Section 20.04.003 limits rockery walls used for benching to six feet in height. Verify setbacks and easements before building near a property line.
Building an unpermitted or over-height retaining wall triggers a stop-work order, required engineering review, and possible removal. Fines apply until the wall is corrected or permitted.
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