Marin County Unincorporated

Accessory Structure, Detached. There are two types of accessory structures: (1) buildings, and (2) affixed improvements including fences, retaining walls, septic systems, utility lines, outdoor appliances, back-up generators, propane tanks, fountains and other water features. A structure is considered to be accessory when it is secondary and incidental to, and commonly associated with the primary structure or use.

Bay Window. A windowed enclosure that projects from an exterior wall and is at least 18 inches above the adjoining finished floor as measured to the lowest horizontal plane of the projection. To be considered a bay window for the purposes of allowed exemptions and floor area, the windowed enclosure shall not occupy an area greater than 25 percent of any individual wall element of a building for each story or extend more than 30 inches from the exterior wall.

Demolition. The act of tearing down, removing, or replacing an existing building, structure, or other physical improvement. For structures other than buildings (e.g. fences, retaining walls), removal of more than 75 percent of the length or area of the structure shall be considered demolition. For buildings, cumulative removal or substantial modification of more than 75 percent of the linear sum total of a building's exterior walls, counted for all stories, shall be considered demolition of the building.

Density. The number of dwellings per acre of lot area, unless otherwise stated, for residential uses.

Dwelling, or Dwelling Unit. A room or group of internally connected rooms that have sleeping, food preparation, eating, and sanitation facilities, but not more than one kitchen, which constitute an independent housekeeping unit, occupied by or intended for one household on a long-term basis. Types of dwellings include single-family dwellings, two-family dwellings, multi-family dwellings, mobile homes, condominiums and townhouses, floating homes, and independent living units for the elderly.

Yard. An area between a lot line and a setback, unobstructed and unoccupied from the ground upward, except for projections permitted by this Development Code. See Section 22.20.090 (Setback Requirements and Exceptions) and Figure 8-7 (Setbacks). 1. Front Yard. An area extending across the full width of the lot between the front lot line and a structure. 2. Rear Yard. An area extending the full width of the lot between a rear lot line and a structure. 3. Side Yard. An area extending from the front yard to the rear yard between the nearest side lot line and a structure. 4. Interior Yard. An area between a lot line and a structure that does not abut a street or right-of-way.

Wind Energy Conversion System (WECS) (land use). This land use is defined as any machine that converts and then stores or transfers the kinetic energy in the wind into a usable form of mechanical or electrical energy. The WECS consists of all parts of the system, including the base or foundation tower, wind turbine, generator, rotor, blades, supports, and transmission equipment. Additional WECS definitions include: 1. Small Wind Energy Conversion System. This land use is defined as: (1) any small freestanding WECS up to 40 feet in total height above grade; (2) a roof-mounted WECS utilizing a horizontal-axis wind turbine (HAWT) or a vertical-axis wind turbine (VAWT) and not exceeding ten feet in height above the roof line of the structure; or (3) a non-grid-tied WECS used solely to pump water for agricultural uses and not exceeding 100 feet in total height above grade. 2. Medium Wind Energy Conversion System. This land use is defined as any WEC project between 40 feet and 200 feet in total height above grade. 3. Large Wind Energy Conversion System. This land use is defined as any WECS project greater than 200 feet in total height above grade.

Bed and Breakfast Inns (land use). This land use consists of providing up to five guest bedrooms for overnight lodging, where the use is clearly secondary and incidental to the use of the property as a single-family residence. County requirements applicable to Bed and Breakfast Inns are in Section 22.32.040 (Bed and Breakfast Inns), and applicable Health Department regulations. A Bed and Breakfast Inn with more than five guest rooms is considered a hotel or motel, and is not permitted in a residential zoning district.

Child Day-Care Facilities (land use). This land use consists of the provision of nonmedical care and supervision of minor children for periods of less than 24 hours. This land use includes the following types of facilities, all of which are required to be licensed by the California State Department of Social Services: 1. Child Day-Care Center (land use). This land use consists of commercial or non-profit child day-care facilities designed and approved to accommodate 15 or more children. 2. Large Family Day-Care Home (land use). This land use consists of a day-care facility located in a single-family residence where an occupant of the residence provides care and supervision for eight to 14 children. 3. Small Family Day-Care Home (land use). This land use consists of a day-care facility located in a single-family residence where an occupant of the residence provides care and supervision for either six or fewer children, or eight or fewer children provided that no more than two of the children are under the age of two and at least two of the children are over the age of six.

Commercial Solar Facility. Photovoltaic solar electric panels, as well as appurtenant structures and facilities, designed to provide energy for off-site use such as through a feed-in tariff. Only those solar facilities that provide more than 125 percent of the power used on-site as determined by industry averages for a particular use or utility averages are considered commercial solar facilities.

Cottage Industry (land use). This land use consists of the design, light manufacturing or product assembly, and the sale of products and services inside a dwelling or within an accessory building located on the same site as the dwelling, by the inhabitants of the dwelling. This land use involves the design, manufacture, and sale of the following products and services, or other uses determined by the Director to be similar in nature including: See Section 22.32.060 (Cottage Industries)

Agricultural Worker Housing. Any attached and detached dwelling unit used to house agricultural workers and their family members, including temporary mobile homes. For the purpose of calculating density, no more than one food preparation area shall be provided for each agricultural worker housing unit.

Adult Day Program (land use). This land use consists of a non-medical community based facility that provides a program of care to people 18 years of age or older in need of personal care services, supervision, or assistance essential for sustaining the activities of daily living or for the protection of the individual. The facility cannot be open more than 16 hours per day and must be licensed by the California Department of Social Services as an Adult Day Program.

The AH combining district allows affordable housing development at a density of 20 dwelling units per acre.

Where the B combining district is applied, the minimum lot area, setback, height, and floor area ratio standards in Table 2-11 shall be required, instead of those that are normally required by the primary zoning district.

This subzone includes a 100-foot wide band landward on undeveloped lands... Development should not encroach into wetlands... Buffer zones between development and identified or potential wetland areas should be provided.

The Bayfront Conservation (-BFC) combining district is intended to regulate land and water uses, to prevent destruction or deterioration of habitat and environmental quality.

No buildings or structures shall be constructed within an F-1 district. No dredging, filling or levee or dike construction shall be permitted.

No buildings, structures, levee, dike, fill, or any other activity shall be permitted within an F-2 district, if it would reduce the ponding area and capacity of any parcel of land within the F-2 district.

The HOD combining district allows housing development at a density described in table 2-12 below and offers ministerial review for housing development projects.