The length of time it takes to build an ADU in San Diego varies depending on the size and complexity of the unit, as well as any permitting or zoning requirements. In general, it will take roughly 3 months and can can get up to 8 months on most properties in San Diego. This is not including the plans and permits that can take also 2-6 months in most cases. But if you want an Accessory Dwelling Unit (ADU), get a Free estimate from us.