Capacity charges for ADUs are waived if the unit is under 499 square feet, and based upon square footage for all other units. Section 5.02.030 (PDF) of the NapaSan Code lists the capacity charge assessments for different types of residential units.
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The capacity charge for a single family dwelling from July 1, 2018 to June 30, 2019 is $9,624.
NapaSan defines separate dwelling units to include a living space with a kitchen. Examples of dwelling units include, but are not limited to:
An ADU is a secondary dwelling with complete living facilities for one or more persons that can be attached, detached, or re-purpose existing space.
Renovations within single family dwellings or multiple family dwellings will not trigger additional capacity charges, except where additional dwelling units are added to the property.