Can I build an ADU on a large lot in Santa Rosa?

Hello and welcome to the world of ADU development! It’s fantastic that you’re considering building an ADU on your large lot in Santa Rosa, as it can certainly add value to your property while providing a flexible living space for your family. Let’s break down your questions step by step to help you get started on the right foot.

### 1. Lot Coverage and Setbacks

In Santa Rosa, like many Californian cities, ADUs must adhere to specific zoning regulations regarding lot coverage and setbacks. For a lot like yours, around 10,000 square feet, the city’s zoning code generally allows for a generous ADU footprint. Here’s what you need to know:

- **Setbacks**: ADUs typically require a minimum rear and side setback of 4 feet. However, be sure to verify if there are any unique requirements specific to your neighborhood or property zone by checking the Santa Rosa Zoning Code (Chapter 20-42, Article 2).

- **Lot Coverage**: The maximum lot coverage will depend on your zoning district, but generally, ADUs can account for a substantial portion of your available lot. For example, if your property is zoned for single-family residential, you might be allowed up to 40% total lot coverage, inclusive of all structures.

### 2. Parking Requirements

Santa Rosa has progressive ADU policies, particularly concerning parking. Under state law (California Government Code Section 65852.2), you are required to provide one additional parking space per ADU. However, there are several exemptions to this requirement:

- If your property is within half a mile of public transit, you are exempt from additional parking requirements. You should check proximity to local transit lines to see if this applies.

- ADUs converted from existing space within the primary residence or existing structures (like garages) also typically do not require additional parking.

### 3. Impact Fees

Regarding impact fees, you’re in luck if you plan to build an ADU under 750 square feet. According to California AB-68, cities cannot impose impact fees on ADUs of this size. For larger units, fees will be proportionate to the primary dwelling unit's size.

It’s wise to contact the Santa Rosa Planning & Economic Development Department directly to get an estimate tailored to your specific plans, as fees can vary based on services like sewer and water connections.

### Budget and Timeline

Given your budget of $150,000, you’re in a solid position to build a quality ADU. Here’s a rough breakdown of costs in Santa Rosa:

- **Construction Costs**: Expect costs to range from $150 to $300 per square foot, depending on finishes and complexity. For a 600 sqft ADU, this might range from $90,000 to $180,000.

- **Permitting and Design**: Budget around $5,000 to $15,000 for architectural designs, engineering, and permits.

- **Utilities**: Connecting utilities can add $5,000 to $15,000 depending on the existing infrastructure.

### Practical Steps and Tips

1. **Research and Plan**: Begin by clearly defining your ADU’s purpose and size. Engage an architect or designer familiar with Santa Rosa’s regulations to help draft your plans.

2. **Neighborhood Consultation**: Check with your neighborhood association if applicable, as they might have additional guidelines or support resources.

3. **City Consultation**: Schedule a pre-application meeting with the city’s Planning Department. This will provide you with invaluable insights and help streamline the permitting process.

4. **Choose Contractors Wisely**: Vet contractors thoroughly. Local experience is key, so seek recommendations from neighbors or local forums.

5. **Monitor Construction**: Once construction begins, stay engaged with regular site visits to ensure adherence to plans and timelines.

### Resources

- **Santa Rosa Planning & Economic Development Department**: Their website and office are great starting points for zoning maps and permit application details.
- **California Department of Housing and Community Development**: Offers guides and updates on state-wide ADU laws.
- **Local ADU Workshops or Webinars**: These can be incredibly insightful for understanding nuances and networking with experienced professionals.

Building an ADU is a rewarding endeavor, and with careful planning, it can serve your family well while enhancing your property’s value. If you have any further questions, feel free to ask. Best of luck with your ADU project in Santa Rosa!