Accessory Dwelling Units (ADUs) have become one of the most popular ways for California homeowners to add value to their properties while addressing the state’s ongoing housing shortage. Whether you’re considering a garage conversion, a backyard cottage, or a basement apartment, understanding the ADU construction process is critical to a successful project.
An ADU is a secondary housing unit located on the same lot as a primary residence. ADUs can be attached to the main home, converted from existing space like a garage or basement, or built as a standalone structure. In California, recent legislation has made it easier than ever to permit and construct ADUs, removing many of the barriers that previously discouraged homeowners.
Homeowners in Contra Costa County typically pursue one of three ADU types:
California has enacted several laws—SB 13, AB 68, and AB 881—that limit local governments’ ability to restrict ADU development. Key provisions include reduced setback requirements, expedited permitting, and the elimination of owner-occupancy requirements in many cases.
However, each city and county still has specific zoning rules, height restrictions, and design guidelines. Working with a contractor who understands these local regulations is essential for a smooth approval process.
ADU projects benefit significantly from a design-build approach. Because ADUs must comply with both local zoning and California Building Code requirements, having designers and builders collaborate from day one prevents costly redesigns and delays.
A skilled design-build team can maximize the usable square footage within local constraints, optimize natural light and ventilation, and ensure the finished unit feels like a true home—not an afterthought.
ADU construction costs vary widely based on size, finishes, and site conditions. Garage conversions typically start at a lower price point than new construction, while detached units with high-end finishes can approach the cost of a small custom home.
Requesting a detailed, itemized estimate from your contractor helps you understand where your money is going and where you might have flexibility to adjust.
Not all general contractors have experience with ADUs. Look for a licensed professional with a portfolio of completed ADU projects, knowledge of local permitting, and a transparent communication style.
For homeowners in Contra Costa County ready to explore their ADU options, ADU construction services from an experienced design-build team can turn your vision into a permitted, profitable reality.
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