Local Guide

Orange County SB-684 Implementation: What Property Owners Need to Know

July 01, 2025
Orange County
300 views

Orange County has implemented SB-684 with specific local adaptations that reflect the county's unique character and development patterns. This guide provides property owners with essential information about lot splitting in Orange County.

Orange County's SB-684 Approach

Orange County has been proactive in implementing SB-684, recognizing its potential to address housing needs while respecting existing neighborhood character.

Jurisdiction-Specific Requirements

Orange County includes 34 incorporated cities, each with their own SB-684 implementation:

Major Cities and Requirements:

**Anaheim

**

- Minimum original lot

6,000 sq ft

- Each resulting lot

3,000 sq ft minimum

  • Special requirements in historic districts

**Irvine

**

  • Higher standards due to planned community nature
  • - Minimum original lot

    7,200 sq ft

    • Architectural review may be required
    • **Santa Ana

      **

      • Standard state minimums apply
        • Expedited review for qualifying projects
          • Strong support for housing creation
          • **Newport Beach

            **

            • Coastal Commission coordination required
              • Higher minimum lot sizes in some areas
                • Environmental review may be necessary
                • **Huntington Beach

                  **

                  • Coastal zone considerations
                    • Standard SB-684 requirements
                      • Beach proximity may affect timelines
                      • County Application Process

                        *Pre-Application Phase

                        *

                        1. Initial property assessment

                        2. Zoning verification

                        3. Utility availability check

                        4. Neighborhood compatibility review

                        *Formal Application

                        *

                        1. Complete application package submission

                        2. Administrative completeness review

                        3. Technical analysis and review

                        4. Public notification (if required)

                        5. Final approval and conditions

                        Timeline Expectations

                        *Typical Orange County Timeline

                        *

                        - Application preparation

                        4-6 weeks

                        - Submittal to approval

                        60-90 days

                        - Processing and recording

                        2-3 weeks

                        - Total timeline

                        4-5 months

                        *Factors Affecting Timeline

                        *

                        • Coastal Commission review (adds 30-60 days)
                          • Environmental studies (adds 30-45 days)
                            • Public notification periods (adds 15-30 days)
                              • Holiday seasons and staff availability
                              • Cost Structure in Orange County

                                *Application Fees by City

                                *

                                - Most cities

                                $2,500-4,500

                                - Premium cities (Newport, Irvine)

                                $3,500-6,000

                                - County unincorporated areas

                                $2,800-4,200

                                *Additional Costs

                                *

                                - Coastal Commission review

                                $1,500-3,000

                                - Traffic studies

                                $2,000-5,000 (if required)

                                - Environmental assessment

                                $1,500-4,000

                                Special Considerations

                                *Coastal Areas

                                *

                                • California Coastal Commission oversight
                                  • Sea level rise considerations
                                    • Public access requirements
                                      • Extended review processes
                                      • *Airport Proximity

                                        *

                                        • John Wayne Airport flight path restrictions
                                          • Noise considerations may apply
                                            • Height limitations in some areas
                                            • *Historic Districts

                                              *

                                              • Additional design review required
                                                • Preservation requirements
                                                  • Extended approval timelines
                                                  • Market Conditions

                                                    Orange County's strong real estate market creates favorable conditions for lot splits:

                                                    *Average Property Values

                                                    *

                                                    - Median home price

                                                    $1.2-1.8 million

                                                    - High-end areas

                                                    $2-5 million+

                                                    • Strong appreciation trends
                                                    • *Development Demand

                                                      *

                                                      • High demand for buildable lots
                                                        • Limited inventory drives values
                                                          • Strong rental markets support development
                                                          • Success Factors

                                                            *Choosing the Right Professional Team

                                                            *

                                                            • Use Orange County experienced consultants
                                                              • Verify local jurisdiction expertise
                                                                • Check references from recent projects
                                                                • *Community Relations

                                                                  *

                                                                  • Engage neighbors early in process
                                                                    • Address concerns proactively
                                                                      • Maintain open communication
                                                                      • *Regulatory Compliance

                                                                        *

                                                                        • Understand local variations
                                                                          • Plan for required studies
                                                                            • Budget for extended timelines
                                                                            • Common Challenges

                                                                              *Infrastructure Limitations

                                                                              *

                                                                              • Water supply constraints in some areas
                                                                                • Sewer capacity limitations
                                                                                  • Traffic congestion concerns
                                                                                  • *Community Opposition

                                                                                    *

                                                                                    • Neighborhood character concerns
                                                                                      • Parking and traffic impacts
                                                                                        • Property value impacts on neighbors
                                                                                        • *Regulatory Complexity

                                                                                          *

                                                                                          • Multiple jurisdiction coordination
                                                                                            • Overlapping agency requirements
                                                                                              • Changing regulations and interpretations
                                                                                              • Opportunities for Success

                                                                                                *Strategic Property Selection

                                                                                                *

                                                                                                • Target appropriate neighborhoods
                                                                                                  • Choose lots with good access
                                                                                                    • Consider utility availability
                                                                                                    • *Optimal Timing

                                                                                                      *

                                                                                                      • Plan around seasonal patterns
                                                                                                        • Coordinate with local development cycles
                                                                                                          • Consider market conditions
                                                                                                          • *Professional Relationships

                                                                                                            *

                                                                                                            • Build relationships with local officials
                                                                                                              • Use established professional networks
                                                                                                                • Leverage experienced team members
                                                                                                                • Orange County's implementation of SB-684 provides significant opportunities for property owners who understand local requirements and work with experienced professionals. Success requires careful planning, adequate budgeting, and patience with the regulatory process.

Related Topics:
SB-684 Orange County lot split local implementation California

Ready to Start Your SB-684 ADU Project?

Get expert guidance from our experienced team of architects and contractors.