Retaining Walls: Fillmore vs Port Hueneme

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 retaining wall in Port Hueneme?

Retaining walls over 3 feet tall or supporting a surcharge require a building permit and engineered plans. Walls 3 feet or less generally do not need a permit.

Are there special requirements near the coast?

Retaining walls in the Coastal Zone may need a Coastal Development Permit in addition to a building permit. Contact Community Development at (805) 986-6559.

What about drainage behind retaining walls?

All retaining walls must include proper drainage (weep holes, french drains, or gravel backfill) to prevent hydrostatic pressure buildup that can cause wall failure.