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Sonoma County Unincorporated
City Zoning Code

Article 16.

Supplemental Development Standards. [7]


Footnotes:
--- (7) ---

Editor's note—Ord. No. 6335, § II, adopted February 9, 2021, repealed the former Art. 16, and § III(Exh. A) of the same ord. enacted a new article as set out herein. The former Art. 16 pertained to AR Agriculture and Residential District. See Ordinance List and Disposition Table for a detailed history of derivation.


Sec. 26-16-010.- Purpose of article.

This article contains provisions to supplement the basic development standards for zones found in articles 26-6 through 26-14.

(Ord. No. 6335, § III(Exh. A), 2-9-2021)

Sec. 26-16-020. - Density.

A.

Maximum Allowed. In zones where residential uses are allowed, the maximum number of primary dwelling units per acre is specified in the parcel-specific general plan land use map or zoning database, whichever is more restrictive.

B.

Exempt Units. Accessory dwelling units, junior accessory dwelling units, farm family housing, and agricultural employee housing, where allowed, are exempt from the maximum density standard.

C.

Affordable Housing. Maximum allowed density may be increased in accordance with Article 89 (affordable housing program requirements and incentives).

(Ord. No. 6335, § III(Exh. A), 2-9-2021)

Sec. 26-16-030. - Lot size.

A.

Williamson Act Lands. Subdivision of any Williamson Act contracted lands shall not result in any new parcel less than ten (10) acres in size for type 1 preserves or forty (40) acres in size for type 2 preserves, or the established minimum lot size, whichever is more restrictive. (general plan policy AR-8c)

B.

Clustered Development.

1.

In all zones:

a.

Clustered development is not allowed on land subject to a Williamson Act contract.

b.

When lot sizes are reduced to allow for clustered development, a protective easement shall be applied to the remaining large parcels which indicates that density has been transferred to the clustered area.

2.

In the RRD zone, the minimum lot size in a clustered development is one and one-half (1.5) acres. There is no minimum lot size for clustered development in other zones where clustered development is allowed.

3.

LEA zone (general plan policy AR-3b):

a.

In considering subdivision of lands within "Land Extensive Agriculture" areas except those lands under Williamson Act contract, one-half (frax;1;2;) or three (3) of the permitted residential lots (whichever is greater), may be clustered.

b.

These clustered parcels may be as small as one and one-half (1½) acres but no larger than ten (10) acres. No future subdivision of these small parcels shall be permitted.

c.

All other parcels created in this category shall have a minimum lot size at least as large as the maximum density specified by the land use map or policy AR-8c, whichever is more restrictive.

d.

Lands subject to a Williamson Act contract are restricted from incompatible development under the county's rules for administration of agricultural preserves, as amended from time to time.

4.

DA zone (general plan policy AR-3c, AR-3e, AR-4a):

a.

Where clustered subdivision is permitted, separate clusters on one (1) site from those on another site unless it is clearly demonstrated that the resulting lots will not create the appearance of, or conflicts associated with, residential intrusion.

b.

Any subdivision which proposes to cluster parcels of ten (10) acres or less shall locate those lots around existing residences on the parcel being subdivided. The intent of this policy is to minimize the impact of residential parcels on adjacent agricultural operations.

c.

Where clustered subdivision is permitted, to the extent allowed by law, place an agricultural easement in perpetuity on the residual farming parcel(s) at the time that the subdivision occurs. The easement shall be conveyed to the county or other appropriate non-profit organizations.

d.

The primary use of any parcel shall be agricultural production and related processing, support services, and visitor serving uses. Residential uses in these areas shall recognize that the primary use of the land may create traffic and agricultural nuisance situations, such as flies, noise, odors, and spraying of chemicals.

(Ord. No. 6335, § III(Exh. A), 2-9-2021)

Sec. 26-16-040. - Increased allowed height.

A.

Allowed with Design Review. In the agricultural and resource-based and residential zones, the maximum allowed building height may be increased with design review approval in accordance with Article 82.

B.

Allowed with Use Permit. In the commercial, industrial, PC, and PF zones, the maximum allowed building height may be increased with a use permit. A building with increased allowed height may not exceed the maximum allowed building intensity in the applicable zone.

(Ord. No. 6335, § III(Exh. A), 2-9-2021)

Sec. 26-16-050. - Lot coverage exceptions.

A.

Increased Lot Coverage for Farm Operations. In the agriculture and resources zones and the AR zone, the planning director may allow increased maximum lot coverage for commercial greenhouses, large animal operations, and buildings required for the farm operation to meet water quality or other environmental protection regulations.

B.

Residential Greenhouses and Swimming Pools. The planning director may waive the maximum lot coverage standard for:

1.

Greenhouses in the RR zone; and

2.

Swimming pools in the RR, R1, and PC zones.

C.

Increased Lot Coverage in Commercial, Industrial and PC Zones. In the commercial and industrial zones and the PC zone, the maximum allowed lot coverage may be increased with a use permit provided the development does not exceed the maximum allowed building intensity in the applicable zone.

(Ord. No. 6335, § III(Exh. A), 2-9-2021)

Sec. 26-16-060. - Setbacks.

A.

Street Centerline Setbacks. Minimum street centerline setbacks are measured from the centerline of the abutting public road, street or highway, except as may be otherwise indicated on the district maps.

B.

Farm Animal Accessory Structures. Table 20-1 shows minimum setbacks for in the LIA, LEA, DA, RRD, AR, RR zones for watering troughs, feed troughs, accessory buildings used for the housing or maintenance of farm animals and accessory buildings and runs used for the housing or maintenance of kennel animals.

Table 20-1: Setbacks for Animal Structures in the LIA, LEA, DA, RRD, AR, RR Zones

Measured From Minimum Setback
Front property line 50 ft.
Street side, interior side, and rear property line 20 ft.
Any dwelling on adjacent property 30 ft.

 

C.

Garages and Carports.

1.

Minimum Setback. A garage or carport opening facing the street in the LIA, LEA, DA, RRD, PF, K or any residential zone must be setback at least twenty feet (20') from a front or exterior side property line, except as allowed by paragraph (2) below.

2.

Allowed Adjustments. The following adjustments to the minimum setback standard in paragraph (1) above are allowed in the LIA, LEA, DA, RRD, AR, RR, R1 zones.

a.

If twenty-five percent (25%) or more of the lots on a block or portion of a block in the same zoning district have been improved with garages or carports, the required setback may be reduced to a depth equal to the average front setback of these garages or carports. In no case may the front setback be reduced to less than ten feet (10'). The director may require a use permit if the reduction may result in a traffic hazard.

b.

If a residence is elevated to meet flood requirements, the space underneath the building may be utilized for a garage or carport if it will meet building codes, even if the minimum setback cannot be met, subject to administrative design review approval.

D.

Building Projections. Table 20-2 shows building features which may project into minimum setbacks in the LIA, LEA, DA, RRD, AR, RR, R1, PF, CR zones.

Table 20-2: Allowed Setback Projections in the LIA, LEA, DA, RRD, AR, RR, R1, PF Zones

Building Features Front Setback Side Setback Rear Setback Additional Requirement
Cornices, eaves, canopies, bay windows, fireplaces and/or other cantilevered portions of structures, and similar architectural features 2 ft. 2 ft 2 ft. The projection may not occupy more than one-third of the length of the wall to which it is attached
Uncovered porches, fire escapes or landing places 6 ft 3 ft. 6 ft. None

 

E.

Average Front Setbacks. The following front setback adjustment is available in the LIA, LEA, DA, RRD, AR, RR, R1, PF, CR, and K zones.

1.

If twenty-five percent (25%) or more of the lots on a block or portion of a block in the same zoning district have been improved with buildings, the required front yard may be reduced to a depth equal to the average of the front yards of the improved lots.

2.

In all zones except for PF, CR and K, the front setback may not be reduced to less than ten feet (10').

3.

In all zones except CR and K, the director may require a use permit if the reduction may result in a traffic hazard.

F.

Accessory Buildings. The following standards apply to accessory buildings in the agricultural and resource-based zones and the AR, RR, R1, and PF, CR zones:

1.

Accessory buildings may be constructed within the required setbacks in the rear half of the lot.

2.

Accessory buildings may not occupy more than thirty percent (30%) of the width of any rear setback area.

3.

Accessory buildings may not be located closer than ten feet (10') from the main buildings on adjacent lots. In CR, this setback shall also apply to the main buildings on the same lot as the accessory building.

G.

Swimming Pools. The following standards apply to swimming pools in the agricultural and resource-based zones and the AR, RR, R1, and CR zones:

1.

Swimming pool walls shall be setback a minimum of three feet (3') from:

a.

The rear and side property lines; and

b.

The main building on the same lot.

2.

Conventional pool accessory equipment (pump, filters, etc.) are exempt from minimum setback requirements.

H.

Agricultural Buffers. An agricultural buffer may be required for any nonagricultural land use that adjoins land zoned AR or designated as agricultural land in the general plan. See Section 26-88-040(f).

I.

Additional Setback Provisions. See also 26-88-040 (general yard regulations and exceptions).

(Ord. No. 6335, § III(Exh. A), 2-9-2021)

Sec. 26-16-070. - Parking.

A.

General. Off-street parking shall be provided as required by Article 86 (parking requirements) and this section.

B.

Waived Covered Parking for Single-Family Dwellings.

1.

In the RRD, AR, and R1 zones, the covered parking requirement for single-family dwellings may be waived with design review approval.

2.

In the CR, PC, and K zones, the covered parking requirement for single-family dwellings may be waived with design review approval where the lot size, shape or location allows for parking will be visually screened from adjacent lots and from the common roadways serving the property.

(Ord. No. 6335, § III(Exh. A), 2-9-2021)

Sec. 26-16-080. - Accessory buildings on vacant parcels.

A.

Accessory Buildings on Vacant Parcels. The following requirements apply in the LIA, LEA, DA, RRD, AR, RR, and PC zones:

1.

Accessory buildings may be constructed on vacant parcels of two (2) acres or more in advance of a primary permitted use. Excludes accessory dwelling units.

2.

On vacant parcels less than two (2) acres, accessory buildings may only be constructed if less than one hundred twenty (120) square feet or as incidental to an existing agricultural use.

(Ord. No. 6403, 3-7-2023; Ord. No. 6335, § III(Exh. A), 2-9-2021)