Seawalls, revetments, and bluff retaining walls in Carlsbad require a Coastal Development Permit under CMC 21.201 and California Coastal Act review. Replacement of 50% or more of an existing seawall is treated as new construction requiring a full CDP.
Under California Coastal Act Section 30235 and CMC 21.204, shoreline armoring (seawalls, revetments, bluff retaining walls) is only permitted when required to serve a coastal-dependent use or to protect an existing principal structure in danger from erosion. Routine maintenance is allowed under a Coastal Development Permit Exemption, but the replacement of 50% or more of a seawall, revetment, or bluff retaining wall, or any work that substantially alters the foundation (including pilings or subsurface structures), requires a full Coastal Development Permit. The City of Carlsbad has approved emergency seawalls under emergency CDPs, but standard conditions include waiver of rights to construct additional armoring in the future. New seawall permits are typically conditioned with public-access requirements and sand mitigation fees calculated under the Beach Sand Mitigation methodology.
Unpermitted seawall construction or expansion violates the California Coastal Act and CMC 21.201. Civil penalties under PRC 30820 range from $1,000 to $15,000 per violation, with daily continuing violation fines up to $15,000. The California Coastal Commission may order removal at the owner's expense.
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