Can I build a two-story ADU in Riverside?

Building a two-story ADU in Riverside, CA, can be a fantastic way to add space and value to your property, and you're right—California is indeed supportive of ADU developments, thanks to recent legislation like SB-9 and AB-68. Let's break down your questions and provide actionable advice to guide you through the process.

### Height Restrictions and Design Limitations

In Riverside, the maximum height for detached ADUs typically aligns with local zoning ordinances, which often allow up to 16 feet. However, for two-story ADUs, some areas may permit heights up to 25 feet. It's crucial to check with the Riverside City Planning Division for specific regulations applicable to your neighborhood. You also want to ensure the design harmonizes with the existing homes to maintain neighborhood character. Consider engaging an architect familiar with local styles to ensure compliance and aesthetic alignment.

### Lot Coverage and Size Limits

For your 7,500 square foot lot, Riverside's zoning ordinances generally allow an ADU up to 1,200 square feet, depending on your existing structures and lot coverage restrictions. The city typically allows up to 50% of the existing dwelling size or 1,200 square feet, whichever is smaller. However, ensure that you maintain required setbacks (usually 4 feet from side and rear property lines) and adhere to any specific neighborhood overlay requirements that might affect coverage.

### Parking Requirements

California state law (AB-68) has relaxed parking requirements for ADUs significantly. In Riverside, if your property is within half a mile of public transit, no additional parking is required for your ADU. Given Riverside's emphasis on encouraging ADU development, exceptions are often made, especially if street parking is available or if you're near a transit corridor. Double-check with local authorities to confirm if your property qualifies for these exceptions.

### Budgeting and Costs

For a two-story ADU in Riverside, your budget of $200,000 is reasonable but will require careful planning and cost management. Here’s a rough breakdown of potential costs:

- **Design and Permits:** $5,000 - $15,000
- **Construction Costs:** $150 - $250 per square foot, depending on finishes and complexity
- **Utilities and Hookups:** $10,000 - $20,000
- **Landscaping and Other Expenses:** $10,000 - $20,000

To keep costs under control, consider modular or prefabricated options, which can offer savings on both materials and labor. Additionally, obtaining multiple quotes from contractors and verifying their experience with local ADU projects can prevent unexpected expenses.

### Timelines

Expect the entire process to take anywhere from 8 to 18 months. This includes:

1. **Planning and Design (2-4 months):** Work with architects/designers to finalize plans and submit for permits.
2. **Permitting (2-3 months):** Riverside’s building department is generally efficient, but budget extra time for any required revisions.
3. **Construction (6-10 months):** Once permits are in hand, construction can proceed. Delays often occur due to contractor availability or supply chain issues, so maintain open communication with your builder.

### Next Steps

1. **Research Local Codes:** Visit the Riverside City Planning Division’s website or office to get the most current information on ADU regulations.
2. **Hire Professionals:** Engage a local architect or designer familiar with Riverside’s ADU regulations. Their expertise can help streamline the design and permitting process.
3. **Consult with Neighbors:** Discuss your plans with neighbors to address any concerns about aesthetics or impacts, which can be beneficial if you need community support.
4. **Apply for Permits:** Once your plans are ready, submit them for approval. Be prepared for some back-and-forth adjustments based on feedback.

### Additional Tips

- **Energy Efficiency:** Consider implementing sustainable building practices, such as solar panels or energy-efficient appliances. This not only reduces long-term costs but also aligns with California’s push towards greener building practices.
- **Monitor Regulations:** Keep an eye on any changes in local or state laws that may impact your ADU project, as these can shift with new legislation.

Building an ADU is a significant but rewarding undertaking. By doing your homework and engaging with the right professionals, you can navigate the process smoothly and create a space that serves both your family and the broader community. Good luck with your project!