Retaining Walls: Fillmore vs Ojai

Do I need a permit for a retaining wall in Fillmore?

Retaining walls over 4 feet in height require a building permit with structural engineering plans. Walls supporting a surcharge (driveway, slope, or structure above) may need permits at any height.

Does a retaining wall need drainage in Fillmore?

Yes. All retaining walls should include drainage provisions such as weep holes or French drains to prevent hydrostatic pressure buildup behind the wall, which can cause failure.

Are there special requirements for hillside retaining walls in Fillmore?

Yes. Retaining walls in hillside areas north of town may require geotechnical investigation. Walls in the floodplain may need additional engineering for flood forces. Consult Community Development.

Do I need a permit for a short retaining wall?

Walls under 3 feet generally do not need a permit. Walls 3-4 feet need a grading permit. Over 4 feet requires a building permit with engineering.

What about a wall with a fence on top?

The combined height (retaining wall plus fence) is measured from the lower grade. This combined height must comply with the fence height limits for the applicable yard.

Why is engineering important for Ojai retaining walls?

Ojai's hilly terrain and clay soils create significant lateral pressure. Proper engineering prevents wall failure, especially during heavy rains.