What are the requirements for SB-9 lot splits in Riverside?

James Taylor
October 19, 2025 at 10:08 PM
SB-9 (Lot Splits) Riverside, CA
Hi everyone,

I'm a homeowner in Riverside, California, and I've been considering taking advantage of the new SB-9 regulations to split my lot. My property is a single-family home on a 9,000 square foot lot in a suburban neighborhood. I've done some initial research and understand that SB-9 allows for lot splits under certain conditions, but I'm a bit overwhelmed by the specifics and how they apply to my situation.

Firstly, I'm curious about the exact requirements for lot splits in Riverside under SB-9. Do I need to ensure each resulting lot maintains a minimum size, and if so, what is that size? I've read conflicting information about this, and I want to ensure compliance with local ordinances.

Additionally, I'm working with a relatively tight budget. Are there specific fees or assessments I should be aware of that might impact my decision? For instance, are there any city-imposed costs beyond the typical permits and application fees?

Finally, I understand there might be restrictions related to owner occupancy. Do I need to live on the property for a certain number of years after the lot split, or is that requirement waived under certain circumstances?

I'm eager to hear from anyone who has gone through this process in Riverside or has expert knowledge about it. Thanks in advance for your help!

1 Answer

Argi A
October 19, 2025 at 04:54 PM
Hello!

Congratulations on considering the potential of SB-9 to enhance the utility and value of your property in Riverside. This opportunity, while promising, does come with a set of specific requirements and considerations that you'll need to navigate carefully. Let’s break down the process and requirements for SB-9 lot splits in Riverside, California.

### Understanding SB-9 Lot Split Requirements

**1. Minimum Lot Size:**
Under SB-9, a lot split must result in two parcels of approximately equal size, where the smaller parcel is not less than 40% of the original lot size. For your 9,000 square foot lot, each new parcel needs to be at least 1,200 square feet. Keep in mind that Riverside may have additional local zoning regulations, so it’s prudent to verify with the city’s planning department.

**2. Zoning Requirements:**
The property must be located in a single-family residential zone. Riverside’s zoning maps or planning department can confirm your zoning classification. Additionally, the lot must not be in a historic district or on a site with certain environmental restrictions.

### Fees and Costs

**1. Application Fees:**
Expect typical costs associated with permitting and applications. In Riverside, fees can range from $2,000 to $5,000 depending on the complexity and specific requirements of your project. This includes application processing, environmental assessments if necessary, and possibly additional fees for utility connections.

**2. Impact Fees:**
While SB-9 exempts certain developments from impact fees if the units are less than 750 square feet, larger units will incur these fees. Riverside may have specific impact fees for new dwellings, so check with the local planning office.

**3. Utility Connection Fees:**
Newly created lots will require separate utility connections, which means additional costs. Be sure to budget for new water, sewer, and electrical connections. These can collectively add several thousand dollars to your project.

### Owner Occupancy Requirements

SB-9 mandates that the property owner signs an affidavit stating they intend to live in one of the housing units as their primary residence for at least three years following the lot split. This requirement ensures that the law is used for genuine residential purposes rather than speculative investments.

### Process and Timeline

**1. Planning and Pre-Application:**
Start by consulting with a local planner in Riverside to confirm zoning compliance and discuss your proposal. This step helps identify potential roadblocks early.

**2. Application Submission:**
Submit your application with all necessary documentation, including site plans, environmental reports, and the owner occupancy affidavit. Processing times can vary, but expect a timeline of 60-90 days for review.

**3. Approval and Development:**
Once approved, you can proceed with lot development. This phase includes physical lot division and construction or renovation of structures. Depending on contractor availability and project scope, this can take anywhere from 6 months to a year.

### Common Challenges and Tips

**1. Environmental and Historical Considerations:**
Ensure your lot is not in an environmentally sensitive area or historical district, as these can significantly complicate or prohibit development. Riverside’s local ordinances will provide details on these designations.

**2. Engage Professionals:**
Consider hiring a local surveyor and land use attorney. Their expertise can streamline the process and ensure compliance with all local and state regulations.

**3. Community and Neighbor Relations:**
Maintain open communication with your neighbors. A well-informed community is often more supportive, especially if you address potential concerns proactively.

### Next Steps

1. **Contact Riverside’s Planning Department:**
- Visit their website or call to get the most current details and set up a consultation.

2. **Consult Professionals:**
- Engage with a land use attorney and a civil engineer with experience in lot splits.

3. **Prepare Financially:**
- Ensure you have a buffer in your budget for unexpected costs, which are common in real estate development.

4. **Stay Informed:**
- Keep abreast of any changes in local regulations or state laws that might affect your project.

By following these steps and guidelines, you’ll be well on your way to successfully navigating the SB-9 lot split process in Riverside. Good luck with your project, and feel free to reach out with further questions as you proceed!
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Types of ADUs in Riverside, 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
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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.

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  • 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 Riverside, 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 Riverside.

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Why Build an ADU in Riverside?

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

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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
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Crestline ADU Floor Plan - 3 Bedroom, 2 Bathroom
3 Bed 2 Bath 1,500 sq ft
The Crestline

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

Understanding the different types of Accessory Dwelling Units available in Riverside, 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?

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ADU Cost Guide for Riverside, CA

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

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

Understanding SB-9 (Lot Splits) for ADU Projects

ADU development in Riverside, 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 Riverside, CA

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

Riverside has 20 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 Riverside 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 Riverside, 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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SB-9 (Lot Splits) Riverside ADU Planning Permits
Riverside, CA

This question is specific to Riverside, CA

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