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15.07.310 Accessory dwelling units (ADUs).
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A. Number of ADUs. One (1) ADU shall be allowed on a lot in a residential zoning district in conjunction with any new or existing detached single-family dwelling, subject to special use review.

B. Location.

1. An ADU may be added to or included within a single-family dwelling, or located in a detached accessory structure on the same lot as the principal building.

2. ADUs shall conform to all setback, height, and lot coverage restrictions and any other associated zoning district standards or regulations.

C. Size/Scale.

1. The total square footage of an ADU shall not exceed the smaller of one thousand (1,000) square feet or forty percent (40%) of the total square footage of the principal building excluding any garage area.

2. If an ADU occupies an entire single floor within a principal building, the Town Manager may allow for an increase in the allowed size of the ADU in order to efficiently use all of the floor area, so long as all other standards of this section are met.

D. Subdivision. An ADU shall not be subdivided or otherwise segregated in ownership from the principal building.

E. Occupancy. Either the principal building or the ADU must be occupied by an owner of the property on which the principal building and ADU are located.

F. Parking. One (1) off-street parking space is required for an ADU in addition to the parking required for the principal building. Parking spaces may include private driveways, garages, carports, or off-street areas reserved for vehicles.

G. Exterior Modification. Only one (1) entrance on the front of the principal building is permitted. Additional entrances are permitted on the side and rear of the principal structure. The Town Manager may allow both entrances to the principal building and ADU to be located on the front of the structure where design, site layout, and construction considerations significantly hinder other options. Additions to an existing principal structure or the development of a newly constructed detached ADU shall be designed consistent with the existing facade, roof pitch, siding, and windows of the principal building.

H. Home Occupations. Home occupations shall be allowed, subject to the requirements of this chapter, in both the ADU and the principal structure. (Ord. 711 §1 (Exh. A), 2017)