In California, there are specific guidelines for Accessory Dwelling Units (ADUs) that are 800 square feet or smaller. These units are subject to a uniform set of regulations across different local areas. This means that local jurisdictions are not allowed to add extra rules regarding the design of the structure, its height, lot coverage ratios, or setback requirements. For these smaller ADUs, they can be built as close as 4 feet to the property line and can have a maximum height of 16 feet. However, once an ADU exceeds 800 square feet (up to a maximum of 1,200 square feet), local jurisdictions have more flexibility to enforce their own specific regulations.