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🧱 Retaining Wall permit checklist

A wall holding back soil where grade changes — height triggers engineering and permit thresholds. Print this sheet and take it to your building department.

Typical requirement. Across 20 states we reviewed, about 100% require a permit for retaining wall (verdict: conditional; typical go / no-go: allowed). Common exemption: Retaining walls 4 ft or less are often exempt; a permit is typically required above ~4 ft or if supporting a surcharge. Your city or county sets the exact rule — confirm with the permit checker.

For your specific project, use the permit checker, then open your county permit portal to start the application.