Retaining Walls: Fullerton vs Mission Viejo

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

Retaining walls over 4 feet in height (from footing to top) require a building permit and engineered plans. Walls 4 feet or under may be exempt if they do not retain a surcharge.

Can I put a fence on top of a retaining wall in Fullerton?

Yes, but the combined height of the retaining wall and fence is measured from the lower finished grade and must comply with zoning district fence height limits.

Do hillside retaining walls have extra requirements?

Yes. Retaining walls in hillside areas of northern Fullerton may require geotechnical investigations and drainage plans in addition to standard building permits.

Do I need a permit for a retaining wall in Mission Viejo?

A building permit is required for retaining walls over 4 feet high, including any surcharge. Walls supporting slopes or structures may require permits regardless of height.

What drainage is required for retaining walls?

Retaining walls must include drainage systems such as weep holes or French drains to relieve hydrostatic pressure behind the wall. This is part of the engineering requirements.

Can I build a retaining wall on my property line?

Retaining walls must comply with setback requirements. Walls near property lines may require neighbor notification and additional review. Check with the Building Division for specific setback rules.