What's the process for converting a detached garage in Sunnyvale?

**Converting a Detached Garage into an ADU in Sunnyvale: A Comprehensive Guide**

Hi there! Converting a detached garage into an ADU (Accessory Dwelling Unit) is an excellent way to increase your property’s value and create additional living space. Given your location in Sunnyvale, CA, here’s a detailed breakdown to help you navigate the process smoothly.

### 1. Zoning Regulations in Sunnyvale

In Sunnyvale, as in the rest of California, recent state laws like SB-9 and AB-68 have eased restrictions on creating ADUs. However, you must still comply with local ordinances. Sunnyvale allows for ADUs on properties zoned for single-family and multi-family residences. Here are a few key points:

- **Size and Setbacks**: Your garage, at 400 square feet, falls well within Sunnyvale's allowance for ADUs. The city permits ADUs up to 1,200 square feet, but you’re limited by the existing structure size. Minimum setbacks are typically 4 feet from side and rear lot lines.

- **Height**: Ensure your garage meets height requirements. Detached ADUs are generally restricted to one story, with a maximum height of 16 feet.

- **Parking**: Although state laws have reduced parking requirements, if your property is near public transit, further parking may not be required. Check with Sunnyvale’s Planning Division for specifics.

### 2. Compliance with Building Codes

Ensuring your ADU complies with building codes is crucial, particularly regarding safety features:

- **Egress Windows**: Bedrooms must have egress windows for emergency exits. These windows typically must be at least 5.7 square feet, with a minimum opening height of 24 inches and a width of 20 inches.

- **Fire Safety**: Fire-rated walls may be required if your garage is close to property lines or other structures. Consult with a local architect or contractor familiar with Sunnyvale codes.

- **Inspections**: You’ll need multiple inspections throughout the conversion process—foundation, framing, electrical, and plumbing. Plan these inspections early to avoid delays.

### 3. Connecting Utilities

Connecting utilities can be one of the more complex aspects of a garage conversion:

- **Water and Sewage**: You’ll likely need to extend your current service lines. This can cost between $5,000 to $15,000, depending on proximity and existing infrastructure.

- **Electricity**: Upgrading the electrical panel and connecting the ADU can cost $2,000 to $5,000. Consider installing energy-efficient systems to save on long-term utility costs.

- **Hidden Costs**: Prepare for potential hidden costs like trenching for utility lines or upgrading your main service panel to accommodate additional load.

### 4. Property Tax Implications

California’s Proposition 13 caps property tax increases, but adding an ADU can increase your property’s assessed value. Sunnyvale’s tax assessor will evaluate the new unit based on its construction cost, adding to your property’s overall value. Typically, you can expect an increase proportional to the value of the new construction. Consult with a local tax advisor for personalized advice.

### Practical Steps and Tips

1. **Hire Professionals**: Engage an architect or designer experienced with ADUs in Sunnyvale to ensure your plans meet all codes and regulations.

2. **Budget Wisely**: While your $100,000 budget is reasonable, be prepared for unexpected expenses like enhanced foundation work or utility upgrades.

3. **Plan Your Timeline**: The entire process, from design through construction, can take 6 to 12 months. Permitting might take 2-4 months, depending on city workload.

4. **Check Local Resources**: Visit the City of Sunnyvale’s Planning and Building department’s website or office for specific guidelines and application forms.

5. **Stay Informed**: Attend local workshops or seminars on ADUs, as they often provide updates on regulations and best practices.

6. **Consider Financing Options**: If budget flexibility is required, explore home equity loans or specialized ADU loans offered by local financial institutions.

By following these guidelines and utilizing local resources, you’ll be well-prepared to embark on your garage conversion project. Remember, thorough planning and compliance with local regulations are key to a successful ADU conversion. Best of luck with your project, and enjoy the added value and utility your new space will bring!

Feel free to reach out if you have more questions or need further assistance.