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Accessory dwelling units are allowed subordinate to a single-family dwelling in zones where single-family dwellings are permitted under SCC 30.22.100, 30.22.110, and 30.22.120.

(1) General standards. All accessory dwelling units shall comply with the following standards:

(a) Development of accessory dwelling units shall be subject to compliance with all other applicable provisions of this title;

(b) Development of accessory dwelling units shall be subject to physical and legal availability of water and the applicant providing documentation that the water supply is potable and of adequate flow;

(c) Applicants must provide documentation that the existing or proposed sewage or septic system is capable of handling the additional demand placed upon it by the attached or detached accessory dwelling unit;

(d) The floor area of an accessory dwelling unit shall not exceed 1,200 square feet. Floor areas shall be exclusive of garages, porches, and unfinished basements;

(e) Accessory dwelling units shall meet the off-street parking requirements in chapter 30.26 SCC;

(f) Attached accessory dwelling units shall be designed such that the architectural character of the primary dwelling is preserved. Exterior materials, roof form, window spacing, and proportions shall match that of the primary dwelling; and

(g) Detached accessory dwelling units shall be constructed such that exterior materials, roof form, window spacing, and proportions approximate those of the single-family dwelling. A detached accessory dwelling unit proposed for location within an existing accessory structure is not required to approximate the exterior features of the existing single family dwelling. A mobile home, where allowed as a detached accessory dwelling unit pursuant to subsection (3)(a)(ii) of this section, is not required to approximate the exterior features of the existing single-family dwelling.

(2) Urban zones. Accessory dwelling units are permitted uses in the urban zones on lots with a single-family dwelling pursuant to SCC 30.22.100. One attached accessory dwelling unit and one detached accessory dwelling unit may be established on lots that contain a legally-established single-family dwelling.

(3) Rural, resource, and other zones. Accessory dwelling units are permitted uses in the rural, resource, and other zones on lots with a single-family dwelling pursuant to SCC 30.22.110 and 30.22.120 and the following standards:

(a) One accessory dwelling unit may be established on lots that contain a legally-established single-family dwelling pursuant to the following:

(i) Detached accessory dwelling units are prohibited on lots that do not meet the minimum required lot area, pursuant to SCC 30.23.030, in the zone in which they are located. The following prohibitions also apply:

(A) Detached accessory dwelling units are prohibited on lots in the R-5 zone that are less than five acres in size; and

(B) Detached accessory dwelling units are prohibited on lots in the RC zone that are less than 100,000 square feet in size.

(ii) A mobile home that is subordinate to the single-family dwelling may be allowed as a detached accessory dwelling unit on lots equal to or greater than 10 acres.

(b) Accessory dwelling units shall utilize the same driveway as the primary single-family dwelling. (Added by Amended Ord. 02-064, Dec. 9, 2002, Eff date Feb. 1, 2003; Amended by Ord. 04-021, Mar. 31, 2004, Eff date Apr. 23, 2004; Amended by Amended Ord. 08-101, Jan. 21, 2009, Eff date Apr. 21, 2009; Amended by Amended Ord. 10-072, Sept. 8, 2010, Eff date Oct. 3, 2010; Amended by Amended Ord. 21-018, June 9, 2021, Eff date June 19, 2021; Amended by Amended Ord. 22-006, Mar. 9, 2022, Eff date Mar. 26, 2022; Amended by Ord. 23-133, Dec. 12, 2023, Eff date Jan. 6, 2023).