Part 6. Other Zoning Regulations

Chapter 18.153


18.153.010    Purpose.

18.153.020    Standards for accessory structures, generally.

18.153.030    Standards for attached accessory structures.

18.153.040    Standards for detached accessory structures.

18.153.050    Special provisions for patios and decks.

18.153.060    Special provisions for patio structures and lath-covered structures.

18.153.070    Special provisions for other accessory structures.

18.153.010 Purpose.

The purpose of this chapter is to provide standards for the development of accessory structures1 not used for dwelling1 purposes. (Ord. 16-2015 § 38, 6-2-15.)

18.153.020 Standards for accessory structures, generally.

(a)    Accessory structures1 addressed in this chapter shall not be used for dwelling purposes. Requirements for guesthouses1 are found in Section 18.190.205 and requirements for accessory dwelling units1 are found in Section 18.190.005.

(b)    All detached accessory structures shall not exceed 12 feet in building height1. (Ord. 16-2015 § 38, 6-2-15; Ord. 01-2017 § 11, 1-3-17.)

18.153.030 Standards for attached accessory structures.

An accessory structure1 attached to the main building, made structurally a part of and/or having a common wall with the main building, shall comply in all respects with the requirements of this title applicable to the main building. (Ord. 16-2015 § 38, 6-2-15.)

18.153.040 Standards for detached accessory structures.

Detached accessory structures1 may be allowed when the following standards are met:

(a)    Lot coverage shall not exceed 30 percent of the area of the minimum required rear or side yard in which the structure is placed. Swimming pools are exempt from the coverage limitation.

(b)    At least six feet of separation shall be provided between the accessory structure and any other structure on the same property. Increased separation requirements may be applicable to habitable structures as provided in the building and fire codes. The separation shall be measured from the exterior surfaces of the walls or support members, with the following exceptions:

(1)    A lath-covered structure1 may be any distance from any other structure; and

(2)    A structure not exceeding 120 square feet in floor area1, which is not located in a required side yard1, may be any distance from any other structure, provided it does not block any required means of egress, light or ventilation; and

(3)    Structures may be connected by a breezeway or similar structure.

(c)    On reverse corner lots1, structures within 25 feet of the common property line shall not be placed any closer to the side street property line1 than the required front yard of the adjoining lot, and in no case shall any part of such accessory structure be nearer to the side street lot line than the least width of the side yard required for the main building to which it is accessory.

(d)    Accessory structures located between the front yard setback and the principal structure shall conform to the minimum side yard setback requirements for the principal structure.

(e)    The exterior face of the accessory structure wall shall be set back five feet from any property line. Roof eaves or other similar architectural features may project into required yards, subject to Section 18.170.060 and building and fire code requirements, including fire-resistance rating.

This section does not apply to nonresidential projects and historic sites. Accessory structures on nonresidential sites are subject to applicable building code requirements. Accessory structures on historic sites may be eligible to use historic building codes. (Ord. 16-2015 § 38, 6-2-15; Ord. 04-2016 § 27, 3-1-16; Ord. 05-2021 § 28, 4-20-21.)

18.153.050 Special provisions for patios and decks.

The following provisions shall apply to patios and decks:

(a)    Patios and decks with finished floors not more than 18 inches above grade as measured at the midpoint of the side having the greatest change in elevation may be located in interior side yards and rear yards1.

(b)    Decks with finished floors over 18 inches above grade but not more than 10 feet above grade at any point may encroach into the rear yard to within 10 feet of the rear lot line1, except that no deck finished floor shall exceed a height of five feet in an (H-I) hillside combining district. (Ord. 16-2015 § 38, 6-2-15.)

18.153.060 Special provisions for patio structures and lath-covered structures.

The following provisions shall apply to patio structures1 and lath-covered structures1.

(a)    Patio structures1 and lath-covered structures may encroach into required rear yards to within 10 feet of the rear lot line; provided, that there remains an open space1 equal to 70 percent of the otherwise required yard area.

(b)    Patio structures and lath-covered structures for attached housing1 developments may encroach to within five feet of any side lot line1 (three feet if fire sprinklers are installed); provided, that there remains an open space equal to 70 percent of the otherwise required yard area into which such encroachment is made. (Ord. 16-2015 § 38, 6-2-15.)

18.153.070 Special provisions for other accessory structures.

For convenience, the following cross-references are provided for specialized accessory structures:




Home occupations


Mechanical meters and other equipment


Accessory dwelling units


Swimming pools


Tennis and other sports courts

(Ord. 27-2016 § 23, 12-6-16.)

[Notes Applicable to Chapter 18.153]

1    This term is defined in Chapter 18.25.