Costa Mesa Height Limits Rules (2026): What You Need to Know

The Costa Mesa Municipal Code (CMMC) Title 13, Chapter 2 (Zoning Code) establishes fence and wall height regulations that apply to all residential zoning districts throughout the city. In the required front-yard setback area — the space between the front property line and the front building wall — fences, walls, and hedges are limited to a maximum height of 42 inches (3 feet 6 inches) in single-family and multi-family residential zones. This requirement maintains an open streetscape character consistent with Costa Mesa's established neighborhoods, many of which were developed in the 1950s and 1960s with low or no front-yard fencing. Both solid materials (block walls, wood privacy fences) and open materials (wrought iron, picket fences) must comply with the 42-inch limit within the front setback.

Along side-yard and rear-yard property lines, fences and walls in residential zones may be up to 6 feet in height as measured from the finished grade on the higher side of the fence. Costa Mesa's terrain is generally flat, but where grade differences exist between adjacent properties — particularly in areas near the Santa Ana River bluffs or the elevated neighborhoods near the Mesa — the height measurement methodology matters. For retaining walls that also serve as boundary fences, the total combined height is measured from the lower finished grade, which may reduce the allowable height of the fence portion above the retaining wall. Property owners planning combination retaining wall and fence structures should consult with the Costa Mesa Planning Division to confirm compliance before construction.

Corner lots throughout Costa Mesa are subject to a sight-line visibility triangle restriction at street intersections. Within this triangle — typically measured from the intersection of the two property lines along each street frontage — fences, walls, hedges, and other visual obstructions must not exceed 36 inches in height to ensure drivers and pedestrians have adequate visibility when approaching the intersection. Barbed wire, razor wire, concertina wire, and electrified fences are prohibited in all residential zones. In commercial and industrial zones, barbed wire may be permitted atop a 6-foot or taller fence under certain conditions. Residents seeking to construct a fence taller than the standard zoning limits must apply for a variance through the Costa Mesa Planning Division, which requires a public hearing and specific findings.