Unlock Your Property’s Potential: Building an ADU

Part II - Update

Building an Accessory Dwelling Unit (ADU) in California is a fantastic way to expand your living space, accommodate family members, or generate rental income. To help you navigate the process, here are seven essential steps:​

1. Stay Informed: Recent Changes to ADU Laws

California has implemented legislation to make ADU development more accessible:​

• AB 2533: Allows unpermitted ADUs built before January 1, 2020, to be legalized.​

• SB 1211: Expands the number of ADUs allowed on multi-family properties.​

• SB 1077: Streamlines the permitting process for ADUs in coastal zones.​

Refer to the California Department of Housing and Community Development's ADU Handbook  for comprehensive information​

2. Budget and Financing

Determine your budget and explore financing options. Construction costs vary based on size, design, and materials. The CalHFA ADU Grant Program offers up to $40,000 to reimburse homeowners for predevelopment costs.​

3. Permits and Zoning Regulations

Ensure compliance with local zoning laws and obtain necessary permits. Recent updates aim to simplify this process, but it's crucial to understand specific requirements in your area.​

4. Design and Customization

Tailor your ADU to meet your needs. Many companies offer customizable designs. Discuss your vision with your chosen builder to ensure alignment.​buildzoom.com

5. Sustainability and Energy Efficiency

Incorporate eco-friendly practices and energy-efficient features. Many builders offer sustainable options to minimize environmental impact.​

6. Timeline and Construction Process

Discuss the estimated timeline with your builder. Understanding the construction phases helps set realistic expectations.​

7. Warranty and After-Sales Support

Inquire about warranties and after-sales support for maintenance or future expansions.​

ADU Builders in California

Here are some reputable ADU builders in California:

Abodu - Specializes in designing and building prefabricated ADUs. Abodu offers a range of modern and sustainable designs that are factory-built off-site and delivered for installation. Their ADUs are energy-efficient, utilizing sustainable materials and practices.​

Mighty Buildings -  Specializes in designing and constructing ADUs and other housing structures using 3D printing and advanced robotics technology. Their construction methods are faster, more sustainable, and cost-effective compared to traditional building techniques. They offer customizable designs and a range of floor plans to suit different needs and preferences.​​

California Modulars  - Specializes in designing and constructing modular ADUs. They have experience in navigating the permitting process and offer customizable options for ADU designs. They serve various locations in the Bay Area.​

Acton ADU   - Based in San Jose, California, Acton ADU focuses on designing and building ADUs. They provide design services, permitting, and construction management, serving clients in the San Francisco Bay Area.​

Cottage  - Build custom ADUs with an in-house design team that focuses solely on ADUs, creating efficient and elegant small space designs that result in a smoother permitting process.​

Prefab ADU  - Focuses on prefabricated ADU solutions, offering factory-built ADUs that can be delivered and assembled on-site. They serve clients throughout California, including the San Francisco Bay Area.​

New Avenue Homes
   - A design-build company operating in multiple states, including California, specializing in building ADUs. They offer design, permitting, and construction services, serving clients in the San Francisco Bay Area.​

USModular Inc.
   - Modular construction, including ADUs. They provide turnkey solutions for ADU projects and serve various San Francisco Bay Area locations.​

Villa - Builds scalable, cost-efficient ADUs, providing end-to-end feasibility, design, permitting, and construction services. Villa's ADUs are built using modern offsite construction methods.​

Nonna ADU and Construction Inc.  - Custom-built ADUs, enhancing residential properties across Northern California, including the Bay Area, Sacramento, and San Diego. With over 20 years of experience, Nonna Homes manages every aspect of the ADU project—from custom design and planning to on-site construction—ensuring a hassle-free process. Their ADUs are ideal for additional living space, rental income, or family use, with various options like detached units, garage conversions, and attached ADUs. 

Final Thoughts

Thorough research and open communication with your chosen builder are crucial for a successful ADU project. Review contracts carefully and ask questions before making decisions.