An accessory dwelling unit (ADU) is defined as a self-contained residential dwelling unit located on the same lot as a principal single-family dwelling, but not a recreational vehicle. The habitable living unit provides basic living requirements including permanent cooking and toilet facilities. It may be located either within the same building as the principal single-family dwelling unit and/or in a detached building, and may be created through conversion of an existing structure or through new construction.

A.

Intent.

1.

Provide homeowners with a means of obtaining rental income, companionship, security, services and flexibility in the use of their property as their household composition and needs evolve over time.

2.

Add affordable housing units to the existing housing inventory.

3.

Support more efficient use of existing housing stock and infrastructure by offering environmentally friendly housing choices.

4.

Develop housing units in single-family neighborhoods that are appropriate for people at a variety of stages in the life cycle, that responds to changing family needs, smaller households, and increasing housing costs.

5.

Create new housing units while respecting the look and scale of single-family neighborhoods.

B.

Types of ADUs. There are two types of ADUs:

1.

Detached ADUs in an accessory structure detached from the principal dwelling. Examples include converted detached garages, new construction, or converting a small existing dwelling into an ADU while building a new principal dwelling on the property.

2.

ADUs that are attached to or part of the principal dwelling. Examples include converted living space, attached garages, basements or attics, additions to the existing dwelling, or a combination thereof.

C.

Eligibility.

1.

One ADU is allowed per detached single-family residential unit. ADUs are not permitted with any housing units developed under the provisions of OCMC 17.20.020, Cluster housing.

2.

ADUs may be added to any existing single-family detached residential unit or constructed simultaneously with any new single-family detached residential unit.

3.

ADUs are exempt from the density limits of the underlying zone.

D.

Design Standards. An ADU shall meet the following standards and criteria. If not addressed in this section, base zone development standards apply:

1.

The design and size of the ADU shall conform to all applicable standards in the building, plumbing, electrical, mechanical, fire, health, and any other applicable codes.

2.

Setbacks.

a.

For attached ADUs, any additions to the existing dwelling unit shall not encroach into the minimum setbacks in the underlying zone. However, access structures (e.g. stairs or ramps) may be allowed within the setback if no access can be provided to the unit without encroaching into the setback area.

b.

For detached ADUs, structures shall be located behind the front building line of the principal dwelling or set back a minimum of forty feet, whichever is less, and shall meet all other rear and side yard setbacks for the underlying zone. Legal nonconforming detached structures that are converted into detached ADUs are exempt from this requirement, provided that modifications to the structure associated with the conversion do not cause it to encroach any further into the existing setbacks.

3.

Height. The height of a detached ADU shall not exceed the greater of the height of the principal dwelling unit or twenty feet.

4.

Size. The gross floor area of an ADU shall not be more than eight hundred square feet or sixty percent of the gross floor area of the principal dwelling unit, whichever is less. Conversion of an existing basement to an ADU shall be exempt from these size limits provided that no new floor area will be added with the conversion.

5.

Lot Coverage. The property shall comply with the lot coverage standards of the zoning designation.

6.

Design.

a.

The exterior finish materials shall be similar in type, size and placement as those on the principal dwelling unit.

b.

All windows shall include the same trim type and size as those on the principal dwelling unit, provided that the size of the trim shall be a minimum of two inches in width.

c.

Eaves shall project from the building walls at the same distance as the eaves on the principal dwelling unit.

7.

Parking. No off-street parking is required. If provided, driveways shall comply with OCMC 16.12.035.

E.

Application Procedure. Applications are processed as a Type I minor site plan and design review per OCMC 17.62.035 concurrently with a building permit application.

(Ord. No. 18-1009, § 1(Exh. A), 7-3-2019; Ord. No. 19-1008, § 1(Exh. A), 12-18-2019; Ord. No. 22-1001, 1(Exh. A), 6-1-2022)

Editor's note— Ord. No. 22-1001, § 1(Exh. A), adopted June 1, 2022, repealed §§ 17.20.020 and 17.20.030, which pertained to cluster housing and internal conversion respectively and derived from Ord. No. 18-1009, adopted July 3, 2019 and Ord. No. 19-1008, adopted December 18, 2019.

Live/work dwellings provide important flexibility by combining residential and commercial uses and allowing for commercial uses on the ground floor when the market is ready to support them. These standards apply to all new live/work dwellings. Live/work dwellings shall be reviewed through a Type II process. For all zones where live/work dwellings are permitted, the following standards shall apply.

A.

The ground floor business shall provide visibility, signage and access from the primary street. The building in which the live/work dwelling is located shall architecturally differentiate the ground floor from the upper floors by meeting the following requirements on the ground floor:

1.

The main front elevation shall provide at least fifty percent windows. The transparency is measured in lineal fashion and required between 3.5 feet and six feet from the ground (for example, a twenty-five-foot long building elevation shall have at least 12.5 feet (fifty percent of twenty-five feet) of transparency in length).

2.

Large single paned windows over ten feet in width shall be divided into multiple panes to add human scale by dividing the vertical plane into smaller parts.

3.

Highly reflective or glare-producing glass with a reflective factor of .25 or greater is prohibited on all building façades. Exceptions to this prohibition may be granted for LEED certified buildings when documented as part of the application and requested as part of the land use application.

B.

A live/work dwelling is allowed instead of, or in addition to, a home occupation as defined by OCMC 17.04. The business portion of the dwelling shall be limited to the ground floor and may not exceed fifty percent of the square footage of the entire dwelling, excluding the garage, or one thousand square feet, whichever is the smaller number.

C.

The primary entrance to the business shall be located on the primary street frontage. Alley access is required to provide refuse and recycling service and residential parking. If alley access cannot be provided, an alternative parking and refuse and recycling service plan may be approved by the community development director if it meets the intent of the standards.

D.

The applicant shall show that there is adequate on-street or off-street parking for the proposed use. One parking space is required for every five hundred square feet of commercial, personal service, or office use or a portion thereof. For example, seven hundred square feet of commercial use requires two parking spaces. Adequate parking can be shown by meeting one of the following:

1.

Shared Parking. Required parking may be satisfied by the same parking facilities used jointly, to the extent that the owners or operators show that the need for parking facilities does not materially overlap (e.g., uses primarily of a daytime versus nighttime nature) or the live/work use is utilizing a parking space that is above the minimum parking requirement of the shared use, and that the shared parking facility is within one thousand feet of the potential uses, and provided that the right of joint use is evidenced by a recorded deed, lease, contract, or similar written instrument establishing the joint use.

2.

On-Street Parking. On-street parking dimensions for live/work units shall conform to the standards set forth in OCMC 17.52.010.C.

3.

On-Site Parking. Parking spaces are provided on-site and meet the requirements of OCMC 17.52, Off-Street Parking and Loading. Driveways shall comply with OCMC 16.12.035.

E.

The number of employees permitted on-site for employment purposes shall be limited to five persons at one time.

F.

All live/work dwellings shall be subject to ongoing compliance with the following performance standards:

1.

The work use shall not generate noise exceeding fifty-five-decibel level as measured at the lot line of the lot containing the live/work dwelling.

2.

No outside storage of materials or goods related to the work occupation or business shall be permitted. Solid waste associated with the work use shall be stored inside the building.

3.

No dust or noxious odor shall be evident off the premises.

4.

If the business is open to the public, public access shall be through the front door and the business may not be open to clients or the public before seven a.m. or after eight p.m.

(Ord. No. 18-1009, § 1(Exh. A), 7-3-2019; Ord. No. 19-1008, § 1(Exh. A), 12-18-2019)

A.

Purpose. Manufactured home parks provide locational opportunities for manufactured dwellings, to support a variety of affordable housing options. These manufactured home park requirements provide standards for orderly development, adequate vehicle circulation, parking, pedestrian circulation, open areas, and landscaping.

B.

Review Required.

1.

New manufactured home parks and modifications to existing parks shall be subject to a Type II Land Use Review to determine compliance with OCMC 17.20.050.

2.

Placement of a single manufactured home within an existing space or lot within a park shall require Type I Minor Site Plan and Design Review pursuant to OCMC 17.62.035.A to determine compliance with OCMC 17.20.050.

3.

Applications for new or modified manufactured home parks shall include a site plan drawn to scale of the specific layout of the entire park. The site plan shall include both the dimensions and the existing and proposed locations of all utilities, roadways, structures, parking, landscaping and open areas, and manufactured home spaces on the site. In addition, the location of structures on adjacent properties shall be shown.

C.

Development Requirements. All manufactured home parks shall meet the following minimum requirements:

1.

The minimum size of a manufactured home park shall be one acre.

2.

The number of units allowed in the manufactured home park shall be subject to the density requirements of the underlying zone after area used for public and private streets, access drives and any other areas that may be deducted pursuant to the definition of net developable area in OCMC 17.04.810 has been deducted.

3.

Except for accessory structures, a minimum setback of fifteen feet is required around the outer boundary of the manufactured home park. Exterior boundaries of the park shall be screened to a height of six feet by a sight-obscuring solid wall, fence, or evergreen or other suitable hedge planting, exclusive of required openings, except where height is limited pursuant to OCMC 17.54.100. Chain link fences are prohibited unless screened with vegetation.

4.

Each manufactured home shall maintain a minimum six-foot setback from another manufactured home. Accessory structures are not subject to minimum setbacks or location requirements, except they shall be setback a minimum of five feet from the outer boundary.

5.

A minimum of fifteen percent of the gross site area shall be landscaped, which may include landscaped setbacks and common open space required in subsection 6 below. A landscaping plan shall be prepared by a registered landscape architect for new or revised landscaped areas and parking lots. Landscape architect approval is not required for tree removal and/or installation if the species are chosen from an approved street tree list. A certified landscape designer, arborist, or nurseryman shall be acceptable in lieu of a landscape architect for projects with less than five hundred square feet of landscaping. All landscape plans shall include a mix of vertical (trees and shrubs) and horizontal elements (grass, groundcover, etc.) that within three years will cover one hundred percent of the landscape area. No mulch, bark chips, or similar materials shall be allowed at the time of landscape installation except under the canopy of shrubs and within two feet of the base of trees.

6.

A minimum of two hundred square feet of open space for each unit in the park, or a minimum of five thousand square feet, whichever is greater, shall be provided in common open space. Streets, access drives and parking lots shall not be considered open space. Open space shall be a mix of landscaping and lawn area, recreational amenities, and hard-surfaced pedestrian paths. Open space areas shall have no dimension less than twenty feet, and shall be landscaped and maintained by the park owner.

7.

A manufactured home park shall have an entrance drive from a public street. Access to individual units shall be from private streets within the site which have a minimum width of twenty-four feet of paving from curb to curb. A paved sidewalk shall be provided along at least one side of each private street in the park and shall be a minimum of four feet in width. Parking shall be permitted on one side of those private streets constructed with a minimum width of thirty feet of paving.

8.

Off-Street Parking. An on-site paved parking area shall be provided for each manufactured home, either within the park or adjacent to each unit.

9.

Except for a structure which conforms to the state definition of a manufactured dwelling accessory structure, no other extension shall be attached to a manufactured dwelling, except a garage or carport constructed to the specifications of the Oregon State Structural Specialty Code.

10.

Standards of the underlying zone also apply except where otherwise provided for in this subsection.

11.

Parking lots greater than two spaces, refuse and recycling areas, outdoor lighting, fencing, and structures (other than the manufactured homes or accessory structures) are subject to compliance with site plan and design review standards in OCMC 17.62.

12.

Cargo containers and membrane and fabric covered storage areas visible from the adjacent right-of-way are prohibited per OCMC 17.54.010.B.4.

D.

In addition to conformance with these standards, all parks, including any alteration and expansion thereof, shall comply with the manufactured dwelling park and mobile home park rules adopted by OAR 918-600-0005 through 918-600-0030, including the Oregon Manufactured Dwelling and Park Specialty Code, as amended.

(Ord. No. 18-1009, § 1(Exh. A), 7-3-2019; Ord. No. 19-1008, § 1(Exh. A), 12-18-2019)