What are the owner-occupancy requirements for ADUs in Santa Rosa?

John Williams

October 19, 2025 at 10:13 PM

Zoning & Legal Santa Rosa, CA

Hello everyone,

I'm a homeowner in Santa Rosa, California, and I'm considering building an ADU (Accessory Dwelling Unit) on my property. My lot is about 6,000 square feet, and I have a budget of approximately $150,000 for the project. I've done some initial research and understand that Santa Rosa has specific zoning regulations and owner-occupancy requirements, but I'm seeking more clarity on these points before moving forward.

From what I've gathered, it seems like Santa Rosa might have some owner-occupancy rules that could impact my ability to rent out the ADU. I'd appreciate it if anyone could clarify whether these requirements are still in place or if they've changed recently?

Additionally, I'm curious about the following:

1. If owner-occupancy is required, does it mean I need to live in either the main house or the ADU indefinitely, or are there exceptions?
2. How do these regulations affect short-term rentals if I want to occasionally use the ADU for guests or as a vacation rental?
3. If circumstances change, like needing to move for work, what options do I have regarding renting both the primary residence and the ADU?

I'm eager to ensure I'm compliant while maximizing my property's potential, so any insights or resources would be incredibly helpful. Thanks in advance for your assistance!

Looking forward to your expert advice.

1 Answer

Nick

October 19, 2025 at 02:52 AM

Hello!

It's great to hear that you're considering building an ADU on your property in Santa Rosa. ADUs are an excellent way to maximize property utility and can offer a significant return on investment. Let's dive in to address your specific queries and provide you with a comprehensive understanding of the current regulations and processes in Santa Rosa.

### Owner-Occupancy Requirements

As of the latest updates, Santa Rosa has aligned with California’s state-wide ADU laws, which have undergone significant changes in recent years to encourage ADU development. Notably, the state removed owner-occupancy requirements for ADUs until January 1, 2025, under **AB-68** and **SB-13**. This means that, for now, you are not required to live in either the primary residence or the ADU. However, always check for the latest ordinances as local jurisdictions can make amendments or impose new regulations.

### Short-Term Rentals

Regarding short-term rentals, Santa Rosa has specific regulations. Generally, ADUs can't be used for short-term rentals (less than 30 days). This is a common regulation across many California cities to ensure ADUs contribute to the housing stock rather than transient rentals. If your intention is to use the ADU for guests or as a vacation rental occasionally, you may need to explore alternative options such as home-sharing platforms that comply with local regulations or consider longer-term leases.

### Renting Both Units

If circumstances change and you need to relocate, it's crucial to stay informed about any changes in legislation that might affect your ability to rent both the primary residence and the ADU. As of now, you can rent out both units under the absence of owner-occupancy requirements, but ensure you stay updated with local ordinances or any changes post-2025.

### Budget and Costs

With a budget of approximately $150,000, you're within a reasonable range for constructing an ADU in Santa Rosa, depending on the size and amenities you plan to include. A standard ADU in Santa Rosa can cost between $150,000 and $300,000, depending on factors like size, design complexity, and material quality. Here’s a breakdown of typical costs:

- **Design and Permitting**: $5,000 - $15,000
- **Construction**: $120,000 - $250,000
- **Utilities and Infrastructure**: $10,000 - $20,000

### Timeline

The process from design to completion can take anywhere from 9 to 18 months. Here's a step-by-step guide:

1. **Research and Planning (1-2 months)**: Understand zoning regulations, determine ADU type (attached, detached, or conversion), and prepare a budget.

2. **Design and Permitting (2-4 months)**: Work with an architect or designer familiar with Santa Rosa regulations. Obtain necessary permits, which are streamlined under state law but still require local approval.

3. **Construction (6-12 months)**: Engage with a reputable contractor. Construction timelines vary based on the complexity of the project and contractor availability.

### Local Considerations

Santa Rosa’s zoning code allows for ADUs in most residential zones, but be mindful of specific requirements like setbacks, height limits, and parking. Speak with the Santa Rosa Planning and Economic Development Department for personalized guidance.

### Tips and Common Mistakes

- **Engage Local Experts**: Work with architects and contractors who have experience with ADUs in Santa Rosa. They can navigate the local permitting process efficiently.
- **Avoid Overbuilding**: Ensure your design aligns with your neighborhood's character and your budget.
- **Stay Updated**: Regularly check for updates on local regulations regarding ADU development, especially as 2025 approaches.

### Next Steps

1. **Consult with Local Experts**: Reach out to contractors and architects to discuss your vision and get detailed quotes.
2. **Visit Santa Rosa City Hall**: Speak with planning officials to understand any specific requirements or upcoming changes.
3. **Explore Financing Options**: Consider loans specific to ADU construction, such as renovation loans or home equity lines of credit.

By following these steps and staying informed, you'll be well on your way to a successful ADU project. Best of luck with your plans, and feel free to reach out if you have more questions!

Warm regards,

[Your Name]
ADU Consultant and Santa Rosa Specialist

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Types of ADUs in Santa Rosa, 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 Santa Rosa, 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

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

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Why Build an ADU in Santa Rosa?

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 Santa Rosa, 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
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Summit ADU Floor Plan - 2 Bedroom, 2 Bathroom

2 Bed 2 Bath 950 sq ft

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Compact design
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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
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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

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

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Types of ADUs in Santa Rosa, CA

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