ADU Construction in San Jose, CA

The construction timeline for an ADU in San Jose can vary based on the complexity of the project. Typically, a garage conversion can take 2-3 months, while a newly built ADU might take 4-6 months. Factors such as design, permitting, and availability of materials can also affect the timeline.

The cost of building an ADU in San Jose depends on several factors, including the size and design. On average, a garage conversion can cost between $100,000-$120,000, while a new-build ADU typically ranges from $300 to $450 per square foot. Additional costs for permits and utilities should also be considered. 

Yes, while some utilities like electricity can be shared with the main house, San Jose regulations often require separate connections for water and sewer. This helps ensure the ADU operates independently in case it’s rented out or used as a separate living space. 

Yes, ADUs in San Jose can be rented out, but short-term rentals (less than 30 days) are generally not allowed without specific permits. Many homeowners build ADUs for long-term rentals, which can provide a steady source of income and increase property value. 

In many cases, San Jose has relaxed parking requirements for ADUs, especially if the property is near public transit. However, detached or new-build ADUs generally require at least one off-street parking space unless the project qualifies for an exemption. 

San Jose zoning laws for ADUs include a minimum setback of 4 feet from side and rear property lines, with a maximum height of 16 feet for single-story units. There are also size restrictions depending on whether the ADU is attached or detached from the main house, with most ADUs limited to 1,200 square feet.