What are Pomona's specific SB-9 regulations?

Patricia Rodriguez
October 22, 2025 at 05:34 AM
SB-9 (Lot Splits) Pomona, CA
Hi everyone,

I'm a homeowner in Pomona, California, and I've been trying to wrap my head around the specifics of SB-9, especially concerning lot splits. My property is around 9,000 square feet, and I'm considering splitting the lot to potentially build a small additional unit. However, I'm hitting some roadblocks in understanding all the local nuances.

From what I've gathered, SB-9 allows homeowners to split their lots and build two units on each portion, but I'm not entirely clear on how this applies specifically to our city. Does anyone know if Pomona has additional regulations or requirements beyond what's mandated by the state? Also, are there specific design or aesthetic standards I should be aware of?

I'm particularly concerned about budget constraints. With construction costs being what they are, I need to ensure this is financially viable. Does anyone have experience with the associated costs of splitting a lot and building an ADU under SB-9 in Pomona?

Lastly, I've heard some talk about potential restrictions related to historical neighborhoods or zones. My property isn't in a historic district, but how might these regulations affect me if nearby areas are?

I’d really appreciate any insights or experiences you might share. Navigating this has been quite the challenge, and I want to make sure I'm doing everything right. Thanks!

1 Answer

David Chen
October 20, 2025 at 12:41 PM
Hello!

Navigating the intricacies of SB-9 and local regulations in Pomona can indeed be challenging, but with the right guidance, you can make informed decisions about your property. Let’s break down the specifics to help you understand what’s involved in splitting your lot and building additional units under SB-9.

### Understanding SB-9 and Its Implications in Pomona

**SB-9 Overview:**
Senate Bill 9, effective from January 1, 2022, allows California homeowners to split their lots and build up to two residential units on each resulting lot. This is intended to increase housing supply and provide more flexibility for property owners.

**Lot Splitting in Pomona:**
For your property in Pomona, which is approximately 9,000 square feet, SB-9 theoretically allows you to split the lot (provided each new lot is at least 1,200 square feet) and build up to two units on each portion. However, here are some local nuances and steps to consider:

1. **Check Zoning and Local Ordinances:**
While SB-9 provides a broad framework, Pomona may have additional zoning requirements or design standards. Check with the City of Pomona’s Planning Division to confirm any local modifications to state law. Pomona's zoning code might have specific overlays or requirements affecting lot splits or ADU construction.

2. **Design and Aesthetic Standards:**
Pomona might have design review processes to ensure new constructions are in harmony with existing neighborhoods. It’s wise to consult with a local architect familiar with Pomona’s style guidelines.

3. **Cost Considerations:**
- **Lot Split Costs:** The cost of splitting a lot can vary. In Pomona, you might expect legal and survey fees to be between $5,000 to $15,000, depending on complexity.
- **Construction Costs:** Building costs for ADUs range widely. For Pomona, anticipate approximately $150,000 to $300,000 per unit, depending on size, design, and finishes. This includes materials, labor, and permitting fees.
- **Permits and Fees:** Pomona’s permitting fees could range from $5,000 to $10,000 per unit, including impact fees. Check the current fee schedule with the local building department.
- **Utility Connections:** New utility connections can be a significant expense, sometimes running $10,000 to $30,000 depending on the complexity and existing infrastructure.

### Historical and Zoning Considerations

**Historical Districts and Zones:**
Since your property isn’t in a historic district, you might not face additional restrictions, but proximity to such zones could warrant extra scrutiny. Verify with Pomona’s historical preservation office to ensure compliance if your property is near a designated area.

### Practical Steps and Timeline

1. **Initial Consultation:**
Engage with Pomona's Planning Division early. They can clarify local amendments to SB-9 and identify potential obstacles.

2. **Hire a Local Professional:**
Consider hiring a local architect or planner with experience in Pomona’s regulatory environment. They can help streamline design approval and navigate local requirements.

3. **Survey and Legal Work:**
Conduct a land survey and legal parcel split. This process might take 2-4 months, including city approvals.

4. **Design and Permitting:**
Allow 3-6 months for design and permitting. This includes architectural plans, city submissions, and any required revisions.

5. **Construction:**
Construction timelines can vary. Expect 6-12 months for building ADUs, contingent on the complexity of your project and contractor availability.

### Common Mistakes and Tips

- **Underestimating Costs:** Ensure you have a comprehensive budget that includes contingencies (15-20% is advisable).
- **Ignoring Local Rules:** Pomona’s local ordinances might impose additional requirements. Always verify with local authorities.
- **Skipping Professional Guidance:** Engaging professionals early can save time and prevent costly design revisions.

### Next Steps

- **Resource Utilization:** Visit Pomona’s city website and review the Planning and Development section for specific guidelines and contact information.
- **Community Meetings:** Attend local planning commission meetings to understand current trends and community sentiments.
- **Consultation:** Schedule meetings with the Planning Division and potentially a local real estate attorney for legal guidance on lot splitting.

By following these steps and keeping local regulations in mind, you’ll be well-equipped to make informed decisions about your property. Best of luck with your project, and feel free to reach out if you have further questions!
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Types of ADUs in Pomona, CA

Understanding the different types of Accessory Dwelling Units can help you choose the best option for your property and needs.

Detached ADU

A separate, standalone structure built on your property. Offers maximum privacy and flexibility for tenants.

  • Complete privacy
  • Custom design options
  • Higher rental income potential
Attached ADU

An addition to your existing home with a separate entrance. Cost-effective option with shared utilities.

  • Lower construction costs
  • Shared utility connections
  • Family-friendly proximity
Garage Conversion

Convert existing garage space into a livable unit. Most cost-effective ADU option with fastest approval.

  • Lowest construction cost
  • Faster permitting
  • Uses existing structure
JADU

Junior ADU created within the existing home. Maximum 500 sq ft with efficiency kitchen and shared utilities.

  • Minimal construction
  • No parking requirement
  • Perfect for family use
Upper Floor ADU

Add a second story or convert existing upper floor space. Maximizes property value and rental potential.

  • Premium rental rates
  • Enhanced privacy
  • Great city views
Basement ADU

Convert basement or lower level into living space. Great option for properties with existing below-grade areas.

  • Uses existing space
  • Natural temperature control
  • Sound isolation

ADU Cost Guide for Pomona, CA

Understanding ADU costs helps you budget effectively and make informed decisions about your project. Costs vary based on size, complexity, and local factors.

ADU Type Size Range Cost Range Timeline Best For
Garage Conversion 400-800 sq ft $80K - $150K 3-6 months Budget-conscious homeowners
JADU Up to 500 sq ft $50K - $100K 2-4 months Family use, minimal disruption
Attached ADU 600-1,000 sq ft $120K - $200K 4-8 months Shared utilities, family proximity
Detached ADU 600-1,200 sq ft $150K - $300K 6-12 months Maximum rental income
Two-Story ADU 800-1,500 sq ft $200K - $400K 8-15 months Maximizing property value
Cost Factors to Consider
  • Site Preparation: $5K - $25K
  • Permits & Fees: $3K - $15K
  • Utility Connections: $5K - $20K
  • Finish Level: $10K - $50K variance
  • Landscaping: $2K - $10K
Potential ROI
  • Rental Income: $1,500 - $4,000/month
  • Property Value Increase: 20-30%
  • Payback Period: 8-15 years
  • Tax Benefits: Depreciation allowances
  • Equity Growth: Long-term appreciation
Get Your Personalized Cost Estimate

These are general ranges. Your actual costs may vary based on specific site conditions, design choices, and local market factors in Pomona.

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Why Build an ADU in Pomona?

Financial Benefits
Rental Income: Generate $18,000-$48,000 annually
Property Value: Increase home value by 20-30%
Tax Benefits: Depreciation and expense deductions
Investment: Strong ROI in California markets
Lifestyle Benefits
Multigenerational Living: Keep family close while maintaining privacy
Home Office: Create dedicated workspace or studio
Guest Space: Comfortable accommodations for visitors
Sustainability: Increase housing density efficiently

Popular ADU Floor Plans

Explore our most popular ADU designs that work well in Pomona, CA. These professionally designed floor plans optimize space and functionality while meeting local building requirements.

Cascade ADU Floor Plan - 2 Bedroom, 2 Bathroom
2 Bed 2 Bath 1,200 sq ft
The Cascade

Spacious 2-bedroom design perfect for families. Features open living area, full kitchen, and two full bathrooms with optimal privacy.

Open floor plan
Master suite
Laundry room
Summit ADU Floor Plan - 2 Bedroom, 2 Bathroom
2 Bed 2 Bath 950 sq ft
The Summit

Efficient 2-bedroom layout maximizing every square foot. Great for narrow lots with smart storage solutions throughout.

Compact design
Pantry storage
Two full baths
Brookside ADU Floor Plan - 2 Bedroom, 2 Bathroom
2 Bed 2 Bath 1,400 sq ft
The Brookside

Luxurious 2-bedroom design with premium features. Includes master suite, guest bedroom, and spacious living areas.

Large living room
Walk-in closets
Full kitchen island
Sequoia ADU Floor Plan - 3 Bedroom, 2 Bathroom
3 Bed 2 Bath 1,100 sq ft
The Sequoia

Unique 3-bedroom configuration perfect for larger families. Features dual bathrooms and smart space utilization.

Three bedrooms
Laundry room
Multiple closets
Crestline ADU Floor Plan - 3 Bedroom, 2 Bathroom
3 Bed 2 Bath 1,500 sq ft
The Crestline

Premium 3-bedroom layout with maximum comfort. Features spacious bedrooms, walk-in closets, and luxury finishes.

Primary suite
Pantry space
Open concept
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Types of ADUs in Pomona, CA

Understanding the different types of Accessory Dwelling Units available in Pomona, CA can help you choose the best option for your property and budget.

Detached ADU

A standalone structure separate from the main house. Offers maximum privacy and flexibility.

  • Maximum privacy
  • Flexible design options
  • Higher rental income potential
Garage Conversion

Converting an existing garage into a living space. Most cost-effective option.

  • Lower construction costs
  • Faster permitting process
  • Existing utilities nearby
Attached ADU

An addition to the existing house with separate entrance. Balances cost and privacy.

  • Shared utilities
  • Moderate construction costs
  • Easy maintenance access
Ready to Start Your ADU Project?

Get a personalized quote and expert guidance for your Pomona ADU project.

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ADU Cost Guide for Pomona, CA

Understanding ADU costs helps you budget effectively and make informed decisions about your project in Pomona, CA.

ADU Type Size Range Cost Range Cost per Sq Ft Timeline
Garage Conversion 400-800 sq ft $80,000 - $150,000 $200 - $250 3-6 months
Attached ADU 500-1,200 sq ft $150,000 - $300,000 $250 - $350 6-9 months
Detached ADU 600-1,200 sq ft $200,000 - $400,000 $300 - $450 8-12 months
Prefab ADU 400-1,000 sq ft $120,000 - $250,000 $250 - $350 4-8 months
JADU (Junior ADU) Up to 500 sq ft $50,000 - $120,000 $150 - $300 2-4 months
Cost Factors to Consider:
  • Site preparation and utilities
  • Permits and plan review fees
  • Foundation and structural work
  • Finishes and appliances
  • Landscaping and driveway
Ways to Save Money:
  • Choose garage conversion over new build
  • Use prefab or modular construction
  • Keep design simple and efficient
  • Bundle with main house renovations
  • Work with experienced ADU builders
Get Your Personalized ADU Cost Estimate

Our experts will provide a detailed cost breakdown for your specific Pomona property.

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Complete Guide to SB-9 (Lot Splits) ADUs in Pomona, CA

Understanding SB-9 (Lot Splits) for ADU Projects

ADU development in Pomona, CA involves numerous considerations specific to sb-9 (lot splits). Understanding local requirements, best practices, and potential challenges helps ensure project success.

Each ADU project is unique, with specific circumstances that influence design, permitting, and construction decisions. Professional guidance helps navigate these complexities and achieve optimal outcomes.

The GatherADU team has extensive experience with sb-9 (lot splits) aspects of ADU development and can provide expert assistance throughout your project.

SB-9 (Lot Splits) Requirements in Pomona, CA

Local regulations in Pomona, CA have specific requirements that affect ADU development. Understanding these local nuances is crucial for project success and compliance.

Pomona has 26 ADU-related questions in our database, indicating active development interest in your area. This local activity suggests growing expertise among contractors, architects, and city officials familiar with ADU projects.

Common considerations for Pomona include local architectural standards, historical district requirements if applicable, utility connection procedures, and neighborhood-specific zoning overlays that may affect your project.

Expert Insights on SB-9 (Lot Splits)

The GatherADU team has helped hundreds of homeowners navigate sb-9 (lot splits) challenges successfully. Our experience reveals common patterns, effective strategies, and potential pitfalls to avoid.

Professional consultation early in your project can prevent costly mistakes and delays. We've seen how proper planning in the sb-9 (lot splits) phase saves both time and money throughout the entire ADU development process.

Our database contains 85 questions related to SB-9 (Lot Splits), with 85 expert answers providing comprehensive guidance for homeowners facing similar challenges.

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ADU Development Checklist for Pomona, CA

Use this comprehensive checklist to ensure you don't miss important steps in your ADU development process.

Planning Phase
  • Define project goals and budget
  • Research local zoning requirements
  • Evaluate site conditions and constraints
  • Consult with ADU experts
  • Develop preliminary design concepts
Pre-Construction
  • Finalize architectural plans
  • Submit permit applications
  • Select qualified contractors
  • Secure financing if needed
  • Schedule utility connections
Construction Phase
  • Site preparation and excavation
  • Foundation and framing work
  • Rough-in electrical and plumbing
  • Insulation and drywall installation
  • Interior and exterior finishes
Completion
  • Final inspections and approvals
  • Certificate of occupancy
  • Utility meter installation
  • Final walkthrough and cleanup
  • Property insurance updates
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Related Topics
SB-9 (Lot Splits) Pomona ADU Planning Permits
Pomona, CA

This question is specific to Pomona, CA

Local regulations may vary by jurisdiction. Always verify with your local planning department.