Mission Viejo vs Newport Beach

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.

Do I need a permit for a retaining wall in Newport Beach?

Retaining walls over 4 feet in height (measured from bottom of footing to top of wall) require a building permit and engineered plans. Walls under 4 feet may still need a permit if they support a surcharge or are combined with fencing.

Can I build a fence on top of a retaining wall in Newport Beach?

Yes, but the combined height of the retaining wall and fence is regulated. The total height may trigger permit requirements and must comply with the zoning code fence height limits for the applicable yard area.

Do retaining walls in the Coastal Zone need special permits in Newport Beach?

Yes. Retaining walls in the Coastal Zone, especially those visible from public areas or involving grade changes near the coast, may require a Coastal Development Permit in addition to a building permit.