Sec. 3.6.2. Accessory Dwelling

1. Purpose and Objectives
   The Accessory Dwelling housing pattern provides for the development of accessory dwelling units on a lot as an accessory use to a principal use.
2. Base Standards Apply
   Except as specifically set forth in this section, the allowed uses, the dimensional requirements, height limits and general development standards of the underlying zoning district apply.
3. Definition
   An Accessory Dwelling Unit (ADU) is a self-contained dwelling unit that is located on the same lot as another principal use. Accessory Dwelling Units may be detached, attached, or internal to the principal use. Only residential uses are permitted in Accessory Dwelling Units.
4. Accessory Dwelling Unit Regulations
   In accordance with this section, an accessory dwelling unit shall conform with the following development regulations:
   1. An ADU shall be located on the same lot as a principal use and meet both of the following:
      1. The gross floor area of the accessory dwelling shall be less than the gross floor area of the total principal use; and
      2. Shall be affixed to or constructed on a permanent foundation and not be a manufactured home or moveable structure except as specified in Sec. 3.2.6.D.6. below;
   2. There shall be no more than one ADU on the same lot as a principal use unless it is located in a Frequent Transit Area as shown on the City’s Comprehensive Plan which would then allow for up to two ADUs on the same lot as a principal use. However in the Frequent Transit Area, only one ADU can be attached to the principal building. In the case of a townhouse development only one ADU is permitted per townhouse;
   3. It shall be accessed by a lockable external entrance;
   4. Ownership of an ADU shall not be transferred apart from its principal building;
   5. It shall meet all relevant standards and requirements of the UDO, provided however accessory dwelling units shall not be subject to Sections 6.7.1. and 6.7.2. with the exception of 6.7.2.B.
   6. An Accessory Dwelling Unit may be a Manufactured Home as defined in Article 12.2 if it meets all of the following:
      1. The predominant roofline shall have a pitch of 5:12 or greater.
      2. The eave projections of the roof must not be less than ten inches (excluding roof gutters) unless the roof pitch is 8:12 or greater.
      3. The minimum height of the first-story exterior wall must be at least seven feet, six inches.
      4. Materials used as exterior wall covering shall be of a non-reflective material.
      5. Foundation skirting shall comply with the requirements set forth in Section 4.5.3.D.
      6. The Manufactured Home is no greater than 600 square feet in gross floor area.
   7. Unless attached thereto by a common wall, an ADU must be separated by at least 6’ from any other building on the lot.
   8. All ADU entrances must be externally accessible by pedestrians from either the driveway, street and/or alley from which the lot takes access.
   9. Encroachments into setbacks are permitted pursuant to Section 1.5.4.D.
   10. Vertical encroachments are permitted pursuant to Sections 1.5.7.D.2. and 1.5.7.D.3.g.
5. Description
   An Accessory Dwelling Unit (ADU) is a self-contained dwelling unit that is located on the same lot as a principal building that meets the regulations identified in Section 3.3.2. An ADU may be located above a garage. ADUs may be detached, attached, or internal to the principal building. Only residential uses are permitted in ADUs.

¹Gross floor area shall include all conditioned space. Attached unconditioned space shall be included in the calculation of accessory structure floor area.
²For townhouse lots, H3 shall only apply to the side site boundary.
³For townhouse lots, H4 shall only apply to the rear site boundary.