All accessory structures shall be incidental and subordinate to the principal use and/or structure on the property.

An accessory structure shall be under the same ownership or control as the principal structure and/or use on the property.

No accessory structure shall be established or constructed before the main dwelling or structure is under construction, and no accessory structure shall be occupied prior to issuance of a certificate of occupancy for the main dwelling or structure.

No accessory structure shall include a residential dwelling, nor may an accessory structure be rented or otherwise used as a separate dwelling, except as provided in RCC § 18.225.080.

All accessory structures shall comply with any and all applicable standards and requirements of the International Building and Fire Codes.

Play structures less than 15 feet in height and with a covered and/or enclosed floor area of less than 30 square feet are exempt from the general restrictions of this chapter, but must comply with all setback requirements for accessory structures.

It shall be the sole responsibility of the property owner to obtain a release from the utility companies and any other entity holding rights to public utility or other easements on the property prior to any construction within those areas.

Storage containers, freight containers, box cars, and similar storage equipment are prohibited, but may be used as the internal structure of an accessory building as described in RCC § 18.225.040(3)(b)(i). All other applicable provisions of this code also apply. Storage containers may not be stacked. Temporary storage containers may be used during a move provided they are placed on private property and not in the public right-of-way. Temporary containers may not be present on the property for more than seven days.

All accessory structures located between the main structure and the side property line shall maintain the same side yard setback as required for the main structure.

All accessory structures on corner lots shall maintain the minimum corner side yard setback as required for the main dwelling.

Single-story accessory structures of 200 square feet or less and below 16 feet in height shall be located a minimum of one foot from the side property lines, provided no portion of the building extends over the property line and runoff is contained to the property.

Accessory structures over 20 feet in height and/or including a second floor or story shall have a minimum side yard setback of 15 feet.

Single-story accessory structures of 200 square feet or less and below 16 feet in height shall be located a minimum of one foot from the rear property line, provided no portion of the building extends over the property line and runoff is contained to the property.

Accessory structures over 20 feet in height and/or including a second floor or story shall have a minimum rear yard setback of 15 feet.

The maximum height of accessory structures shall be 20 feet. On property of at least 10,000 square feet the maximum height may be up to 25 feet.

Accessory structures on property below one-third acre (14,000 square feet) in size shall be limited to one story. Unfinished storage areas under the roof trusses may be permitted, but shall not include finished walls or ceiling, or utilities such as plumbing or electrical not associated with mechanical equipment. Access to such unfinished storage areas shall not include stairs, and shall utilize ladder access only. On property of at least one-third acre and zoned R-3, R-2, RR-22, R-1, or A-5, a second story may be allowed.

Height shall be measured from finished grade to the highest point on the structure.

Accessory structures of 200 square feet or less shall be consistent in color and design with the main dwelling.

Accessory structures greater than 200 square feet shall utilize only exterior building materials that are present on the main dwelling, excluding trim and nonarchitectural elements, structural materials, and prohibited materials. Colors shall be similar in tone and complementary to those used on the main dwelling. Wood or wood product siding, exposed plywood or particle board, corrugated metal, or similar materials are prohibited as exterior materials. Fiber-cement siding and aluminum or other metal siding may be substituted for vinyl siding if such siding is similar in color and appearance to the vinyl siding used on the main dwelling, as approved by the planning manager.

Where a storage/cargo container is utilized as the interior structure of an accessory building, it must have exterior materials attached compliant with this section. Door(s) and the container roof do not require exterior treatment, but the door(s) must be painted in a single color and free from logos or alphanumeric characters. The storage/cargo container must also comply with all required setbacks and provisions of this code.

Accessory structures greater than 1,200 square feet shall include a minimum of 20 percent of the front exterior walls, and of the street side(s) of a corner lot, in masonry such as brick or stone same type, coloring, and/or style as on the main dwelling.

For accessory structures greater than 200 square feet where exterior materials on the main dwelling consist exclusively of masonry such as brick or stone, the exterior side of the accessory structure facing the front of the lot shall be entirely masonry of the same type and style on the main dwelling. For the remaining sides, the lower one-third of each side shall be masonry as used on the front elevation, and the remaining exterior may consist of stucco and/or vinyl or fiber-cement siding that is complementary to the main dwelling in color and design.

Agricultural structures for animals must be designed such that the primary function of the structure is the keeping of farm animals and/or feed. Structures for the growing of plants shall be designed exclusively for that use, including exterior materials.

Agricultural structures above 20 feet in height shall be located a minimum of 15 feet from side and rear property lines. Agricultural structures 20 feet or below shall be located a minimum of 10 feet from property line. Agricultural structures shall, if located on a corner lot, comply with standard corner lot setback requirements.

Agricultural structures may not be located within 40 feet of any residential dwelling.

Maximum height of agricultural structures shall be 35 feet, with the exception of greenhouses, which may not exceed 20 feet in height.

Agricultural structures may, on approval from the planning department, utilize such exterior building materials that are appropriate to the use, while complementary to the main dwelling and to the surrounding community. Greenhouses must utilize translucent or transparent material designed to allow increased sunlight as the primary exterior material, including roofing material. Where a storage/cargo container is used as an agricultural structure, exterior building materials are required, except for door(s) and roof areas.

Temporary carports may only be used for parking or/and storage of vehicles and/or trailers.

Temporary carports must be less than 200 square feet, have a maximum of two enclosed sides and may not be placed on a permanent foundation.

Temporary carports shall meet the same setback, height, and coverage requirements as other accessory structures. However, carports may be placed directly adjacent to the main dwelling, provided the same side yard setbacks which apply to an attached garage are met.

Setbacks for temporary carports or other such structures are measured to the base of the support structure.

Temporary carports must comply with any and all applicable requirements and standards of the currently adopted building and fire codes.

Converting existing living area within a single-family dwelling, as an addition to an existing single-family dwelling, or within a single-family dwelling created as new construction;

Converting an existing detached accessory building, as an addition to an existing accessory building; or

As a newly constructed accessory building.

General Requirements Applicable to All Accessory Dwelling Units.

Owner Occupancy. The city shall only permit an accessory dwelling unit when an owner occupant lives on the property within either the principal or accessory dwelling unit. Owner occupancy shall not be required when:

Any addition shall comply with the building height, yard requirements, and building coverage requirements of the underlying zoning district.

Entrance Locations. Entrances to an accessory dwelling unit that are located within a single-family dwelling shall only be permitted in the following locations:

Bulk Requirements. Accessory structures containing an ADU shall comply with all applicable general yard, square footage size and height limitations found in this chapter and any accessory building regulation found in the underlying zoning district unless otherwise regulated by this section. An accessory dwelling unit located in an accessory building shall count towards the maximum square footage of all accessory buildings as stated in this chapter. Any loft within the accessory dwelling unit of an accessory building shall not be included in calculating the footprint of the accessory dwelling unit. An accessory building that contains an accessory dwelling unit and any other permitted accessory use shall comply with all building coverage requirements of this chapter.

Maximum Coverage. Shall comply with the accessory building maximum coverage requirements of the underlying zoning district.

Setbacks. Shall comply with the accessory building setback requirements of the underlying zoning.

Building Height. Shall comply with the accessory building height requirements of the underlying zoning.

Size Requirements. An accessory building that contains an accessory dwelling unit shall be subject to the building coverage requirements for accessory buildings found in this chapter.

Entrance Locations. The entrance to an accessory dwelling unit in an accessory building shall be located:

Balconies and Decks. Balconies and decks shall be designed as follows:

Building Permit. Obtain a building permit for construction associated with the proposed accessory dwelling unit, regardless of method of creation. No ADU permit and/or certificate of occupancy shall be issued for an accessory dwelling unit until all associated construction is complete and inspected.

Statement of Owner Occupancy. An application for an accessory dwelling unit shall include documentation, using forms provided by the planning department, that demonstrates an owner occupant resides on the property.

Certificate of Occupancy. No accessory dwelling unit shall receive a certificate of occupancy/ADU permit or be occupied until the property owner completes the registration process outlined in this section. Registration is not required if the ADU is occupied by family members of the property owner.

Failure to comply with the standards and requirements of this section, and any and all other applicable ordinances, standards, or regulations of the city, may result in revocation of the ADU permit and/or certificate of occupancy for the accessory dwelling unit.