What's the timeline for SB-9 approval in Pasadena?

Jennifer Anderson
October 19, 2025 at 10:12 PM
SB-9 (Lot Splits) Pasadena, CA
Hi everyone,

I’m a homeowner in Pasadena, and I’ve been diving into the specifics of SB-9 to understand how it affects lot splits. We have a 10,000 square foot lot and are considering splitting it to build a small ADU for my aging parents and maybe sell the other half in the future. Our budget for this project is around $150,000, so we’re trying to ensure we plan thoroughly and avoid unexpected hurdles.

From what I've gathered, SB-9 allows homeowners like me to split their lots, but I’m getting mixed messages on how long the approval process takes here in Pasadena. Has anyone recently gone through this process? I’d love to hear about your experience and timeline.

Additionally, could someone clarify if there are specific local zoning regulations in Pasadena that might affect the timeline or feasibility of an SB-9 lot split? I’ve read that Pasadena might have some unique constraints compared to other parts of California.

Also, how does the permitting process work once the lot is split? Is it straightforward, or should I prepare for a prolonged wait?

Lastly, I’m curious if there are any hidden costs or additional requirements that might impact our budget. Your insights would be incredibly valuable as I’m trying to gauge the practical steps and timelines involved. Thanks in advance for your help!

1 Answer

Argi A
October 18, 2025 at 04:18 PM
Hello!

Navigating the SB-9 process in Pasadena can indeed be complex, but with the right information, you can streamline the process and avoid common pitfalls. Let’s break down your questions step-by-step.

### Understanding SB-9 in Pasadena

SB-9, effective from January 1, 2022, allows for lot splits and the construction of additional housing units on single-family lots across California. However, cities like Pasadena have some leeway to implement local regulations, provided they don't conflict with the state law's intent to increase housing availability.

### Timeline for SB-9 Approval in Pasadena

1. **Pre-Application Research (1-2 months):** Before submitting any plans, gather as much information as possible. Contact Pasadena's Planning Department to discuss your project idea. They can offer insights specific to your neighborhood and any peculiarities in local zoning laws.

2. **Application Submission (1-3 months):** Once you have your plans ready, submit them for approval. The City of Pasadena typically takes 60 days to review SB-9 lot split applications, assuming your application is complete and meets all requirements. However, this timeline can stretch if revisions are needed.

3. **Review Process (2-4 months):** During this period, city planners will assess your proposal against local development standards, which could include considerations such as historical preservation in certain neighborhoods or unique design guidelines. Be prepared for multiple rounds of feedback.

4. **Approval to Construction (2-8 months):** Once your lot split is approved, you'll need to address any conditions set by the city before starting construction. This could involve infrastructure upgrades or easements. Afterward, apply for building permits for the ADU, which can take another 4-6 weeks for approval.

### Local Zoning Considerations

Pasadena has unique zoning regulations. For example, your lot split must ensure that each resulting lot is no smaller than 1,200 square feet, and both lots must comply with existing zoning ordinances regarding setbacks, height limits, and floor area ratios. Additionally, Pasadena prioritizes preserving its historic character, so if your property is in a designated historic district, expect additional scrutiny.

### Permitting Process

Once your lot is split, the permitting process for building an ADU involves several steps:

- **Architectural Plans:** Engage an architect familiar with Pasadena’s regulations to prepare detailed plans.
- **Permit Application:** Submit these plans along with your permit application. This might require adjustments to comply with specific design guidelines or neighborhood covenants.
- **Plan Check:** The city will conduct a plan check, typically requiring about 4-6 weeks. If corrections are needed, this can extend the timeline.
- **Inspections and Final Approval:** Once construction begins, you’ll undergo inspections at various stages, concluding with a final inspection before you can occupy the ADU.

### Budget Considerations

With a budget of $150,000, it’s crucial to manage costs effectively. Here are some considerations:

- **Fees:** Expect to pay application fees for the lot split and building permits, which can range from $5,000 to $15,000, depending on the complexity.
- **Construction Costs:** In Pasadena, construction costs for an ADU can range from $200 to $400 per square foot. For a small ADU (500 sq ft), budget around $100,000 to $200,000, excluding unexpected expenses.
- **Consultant Fees:** Hiring a consultant or project manager familiar with Pasadena regulations can be invaluable and cost between $5,000 and $10,000.

### Hidden Costs and Common Pitfalls

- **Utility Upgrades:** Adding a new dwelling might require upgrading existing utility connections, which can be costly.
- **Soil and Environmental Reports:** If required, these can add unexpected expenses.
- **Neighborhood Opposition:** Be proactive in communicating with neighbors to mitigate any resistance to your project.

### Next Steps and Resources

1. **Consult a Local Expert:** Engage with a local architect or ADU consultant who has experience with Pasadena’s regulations.
2. **Attend Workshops:** Pasadena occasionally hosts workshops on ADUs and SB-9, which can provide valuable insights.
3. **Check Local Resources:** Visit the Pasadena Planning & Community Development Department’s website for the latest updates and resources.

By preparing thoroughly and leveraging local resources, you can navigate the SB-9 process more efficiently. Stay informed, be patient, and maintain open communication with city planners to ensure a smooth journey from conception to completion. Good luck with your project!

Feel free to reach out if you have any more questions or need further assistance.
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Types of ADUs in Pasadena, 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 Pasadena, 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 Pasadena.

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Why Build an ADU in Pasadena?

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 Pasadena, 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
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Brookside ADU Floor Plan - 2 Bedroom, 2 Bathroom
2 Bed 2 Bath 1,400 sq ft
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Large living room
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Sequoia ADU Floor Plan - 3 Bedroom, 2 Bathroom
3 Bed 2 Bath 1,100 sq ft
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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
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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 Pasadena, CA

Understanding the different types of Accessory Dwelling Units available in Pasadena, 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 Pasadena, CA

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

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

Understanding SB-9 (Lot Splits) for ADU Projects

ADU development in Pasadena, 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 Pasadena, CA

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

Pasadena has 13 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 Pasadena 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 Pasadena, 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) Pasadena ADU Planning Permits
Pasadena, CA

This question is specific to Pasadena, CA

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