What Is an ADU?
An Accessory Dwelling Unit (ADU) is a self-contained living space located on the same property as your primary home. This could be a detached structure, a converted garage, or an attached suite, all with their own kitchen, bathroom, and private entrance.
ADUs are becoming increasingly popular for homeowners seeking rental income, multigenerational living solutions, or ways to increase home value.
1. Faster Approvals and Streamlined Permits
Thanks to recent California ADU legislation (2026), cities are now required to process ADU permits quickly—often within about 60 days. This means planning and building your ADU is faster than traditional home expansions or new construction.
2. Fewer Local Barriers
State law now preempts many local restrictions, helping homeowners overcome inconsistent rules that can otherwise slow or block ADU construction. Restrictions related to lot size, owner-occupancy, and parking requirements are now easier to navigate in most jurisdictions.
3. Lower and Predictable Fees
Building an ADU is now more affordable than ever. Policy changes have capped certain impact fees on smaller ADUs, allowing homeowners to plan their budget with confidence. This makes the financial side of building an ADU more predictable and less stressful.
4. Expanded Flexibility and Options
Whether you are thinking about a garage conversion, a backyard cottage, or even multiple ADUs on a single lot, California’s evolving ADU policies offer more design and use flexibility than ever before.
For homeowners looking for a head start, the City of Danville provides downloadable ADU plans to simplify the design and permitting process (Downloadable ADU Plans).
5. Multiple Benefits for Homeowners
Building an ADU can provide both personal and financial advantages:
🏡 Boost Home Value
Homes with ADUs tend to sell at a premium because they offer extra living space and income potential—a strong selling point in competitive California real estate markets.
💰 Earn Rental Income
ADUs can generate steady passive income, whether leased long-term or listed on short-term rental platforms, helping offset mortgage payments or household expenses.
👵 Support Multigenerational Living
ADUs provide comfortable, independent spaces for aging parents, adult children, or extended family—all while keeping loved ones close.
🏘️ Help Address California’s Housing Shortage
By adding housing units without consuming additional land, ADUs increase overall housing supply, especially in high-demand regions like the Bay Area and Southern California.
🌿 Promote Sustainable Growth
ADUs make smart use of existing infrastructure, reducing urban sprawl and minimizing environmental impact compared to large-scale developments.
Conclusion: A Timely Opportunity
California’s housing landscape is evolving, and ADUs offer a practical, flexible, and financially smart solution for homeowners. Whether your goal is extra space, additional income, or increased property value, adding an ADU may be a wise move in 2026.
