There is no square footage limit for existing space. If you are adding square footage to create an ADU, the square footage of the unit cannot exceed 50% of the main residence. A detached ADU cannot exceed 1,000 square feet.
There is no square footage limit for existing space. If you are adding square footage to create an ADU, the square footage of the unit cannot exceed 50% of the main residence. A detached ADU cannot exceed 1,000 square feet.