How to maximize SB-9 development in Hayward?

Patricia Rodriguez

October 19, 2025 at 10:06 PM

SB-9 (Lot Splits) Hayward, CA

Hey everyone,

I'm a homeowner in Hayward, and I've been digging into the possibilities of leveraging SB-9 for a lot split on my property. My parcel is about 9,500 square feet, which I believe qualifies for the SB-9 lot split, but I'm a bit uncertain about how to proceed effectively. Ideally, I'd like to maximize the potential by perhaps developing an additional unit. My budget is around $200,000, but I'm worried about unforeseen costs.

I've read that SB-9 allows for splitting a single-family lot into two, but I need some expert insights on the practical realities.

1. **Lot Splitting Process:** What are the specific steps I need to take to get the lot split approved by the City of Hayward? Are there any unique local regulations I should be aware of that might affect the timeline or cost?

2. **Development Constraints:** Given my budget, is it feasible to develop a second unit after the lot split, and are there any specific design or zoning constraints in Hayward that could impact this plan?

3. **Impact on Property Value:** How might splitting and developing the lot affect my property value, both positively and negatively? Are there any Hayward-specific trends that I should consider?

4. **Community Input:** Lastly, how important is community feedback or neighborhood opposition in this process? Could it potentially halt or delay my plans?

Any advice or direction from those who've navigated this would be greatly appreciated! Thanks in advance.

1 Answer

Nick

October 18, 2025 at 12:00 AM

Hello!

I'm glad you're exploring the potential of SB-9 for your property in Hayward. Leveraging this legislation to maximize your property's value and utility can be a smart move, but it requires careful planning and understanding of both state and local regulations. Let's dive into your questions:

### 1. Lot Splitting Process

**Steps for Approval:**

1. **Preliminary Research:** Verify your parcel is eligible for SB-9. Typically, parcels zoned for single-family use and not within historic districts or hazard zones qualify. In Hayward, check with the Planning Division to confirm specifics.

2. **Application Submission:** Submit a Tentative Parcel Map application to the City of Hayward. This includes a site plan, proposed lot lines, existing structures, and access points. Expect to include a survey from a licensed surveyor.

3. **Review Process:** The city will review your application for compliance with local zoning and SB-9 requirements. It typically takes 2-3 months for the initial review.

4. **Approval & Conditions:** If approved, the city may impose conditions such as addressing utility access and ensuring each lot has independent access.

5. **Final Map:** Once conditions are met, submit a Final Parcel Map for recording, officially splitting the lot.

**Local Regulations:** Hayward might have specific requirements for infrastructure improvements or impact fees. Contact the city's Planning Division early to understand these nuances.

### 2. Development Constraints

**Feasibility within Budget:**

- **Estimated Costs:** Constructing a new unit could range from $150 to $300 per square foot, depending on design and materials. With a $200,000 budget, focusing on a smaller unit (e.g., a 600-800 sq. ft. ADU) might be feasible.

- **Design & Zoning Constraints:** Hayward follows state ADU laws (AB-68), allowing one ADU and one Junior ADU (JADU) per lot. Pay attention to height restrictions, setbacks, and parking requirements specific to your neighborhood.

- **Cost Management:** Consider modular or prefab ADUs, which can control costs and speed up construction. Engage with a local architect familiar with Hayward's processes to optimize your design for cost-efficiency.

### 3. Impact on Property Value

**Potential Value Changes:**

- **Positive:** Splitting the lot and adding a unit can increase overall property value by enhancing rental income potential and property appeal. In Hayward, ADUs can see a value increase of 20-30% depending on size and location.

- **Negative:** Overdevelopment or poor design might deter potential buyers. Additionally, increased property taxes and maintenance costs should be considered.

**Local Trends:** Property values in Hayward have been appreciating, and the demand for multi-family setups is growing, especially with the Bay Area housing shortage.

### 4. Community Input

**Importance of Feedback:**

- **Community Engagement:** While SB-9 limits the impact of community opposition on lot splits, it's wise to engage neighbors early. This can mitigate friction and foster goodwill.

- **Potential Delays:** Opposition might not halt your project but can delay it through appeals or requests for modifications. Being transparent with your plans can preempt these issues.

### Tips & Next Steps

- **Consult Professionals:** Hire a local real estate attorney or consultant familiar with Hayward's permitting process to navigate potential legal hurdles.

- **Attend Workshops:** The City of Hayward occasionally hosts workshops on ADUs and lot developments. These can provide insights into the latest policy changes and community sentiment.

- **Utilize Resources:** Refer to the City of Hayward's official website and the California Housing and Community Development website for the latest on SB-9 and related legislation.

- **Avoid Common Mistakes:** Don't underestimate the time and cost of utility connections and infrastructure adjustments. Ensure your budget includes these often-overlooked expenses.

In conclusion, while SB-9 offers great opportunities, its success hinges on thorough planning and compliance with local regulations. By following these steps and leveraging local resources, you can maximize your property's potential and meet your development goals within your budget.

Best of luck with your project in Hayward! If you have more questions or need further assistance, feel free to reach out.

Warm regards,

[Your Name]
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Detached ADU

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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
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Site Preparation: $5K - $25K
Permits & Fees: $3K - $15K
Utility Connections: $5K - $20K
Finish Level: $10K - $50K variance
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Rental Income: $1,500 - $4,000/month
Property Value Increase: 20-30%
Payback Period: 8-15 years
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Property Value: Increase home value by 20-30%

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Types of ADUs in Hayward, CA

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