Santa Clarita ADU Zoning Rules & Permit Guide

ADU Regulations in Santa Clarita, California

Updated September 29, 2026

Located in Los Angeles County just north of the Santa Susana Mountains, Santa Clarita's ADU regulations follow California's statewide framework with additional fire safety standards for properties in Very High Fire Hazard Severity Zones.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Santa Clarita as of 2026. Regulations are governed by California's AB 68 (2020), AB 881 (2021), and AB 3182 (2024) which together establish a statewide ADU framework.

Additional Local Requirements for Santa Clarita

• ADU allowed in single-family zones
• Minimum 150 sq ft
• Height limit: 16 ft
• Fire sprinkler requirements for detached units

Frequently Asked Questions About ADUs in Santa Clarita

Can I build an ADU in Santa Clarita?

Santa Clarita permits ADUs under California law. Properties in high fire severity zones may have additional requirements.

What is the maximum ADU size allowed in Santa Clarita?

ADUs in Santa Clarita can be up to 1,200 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Santa Clarita planning department before designing your project.

What are the setback requirements for an ADU in Santa Clarita?

ADUs in Santa Clarita generally require setbacks of 4 ft rear, 4 ft side. California state law (AB 68) limits local setback requirements to 4 feet for existing structures, but always verify with local zoning.