The County classifies a Home Addition (including normal additions and construction of attached patio covers, balconies and other structures attached to the dwelling) as a form of expansion, which is defined as increasing the area or volume occupied by or devoted to a use, increasing the living space or occupant capacity of a structure. The following are not considered to be expansion: the addition of unenclosed porches, patio covers and the like; one enclosed addition of not more than 30 square feet to a dwelling; and the addition of detached accessory structures not for human habitation as accessory to a dwelling.

To determine the type of planning permit required for a proposed expansion, you must determine if your project site is located in a coastal or non-coastal area.

Expansions (also known as building additions) are permitted on all residentially zoned parcels in the non-coastal area. Note: Expansions are also permitted on legal, non-conforming parcels, which meet the setbacks and lot coverage requirements. However, if your project site is located in the coastal zone, the proposed unit must also conform to the development standards listed in Section Sec. 8174-4 of the Coastal Zoning Ordinance.