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Article 08 — Residential Zones.

§ 26-08

Sonoma County Municipal Code · 2026-09 edition · updated 2026-09-27 · Sonoma County

Sec. 26-08-010. - Purpose of article.

This article identifies allowed land uses, permit requirements for land uses, and basic development standards in the residential zones.

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

Exceptions & meaning →

Sec. 26-08-020. - Purpose of residential zones.

A.

General. The residential zones provide areas for housing and other uses compatible with a residential setting.

B.

Specific.

Agriculture and Residential (AR). The AR zone provides lands for raising crops and farm animals in areas designated primarily for rural residential use.

Rural Residential (RR). The RR zone preserves the rural character and amenities in areas best utilized for low-density residential development. Rural residential uses are intended to take precedence over agricultural uses. Agricultural service uses are not allowed.

Low Density Residential (R1). The R1 zone stabilizes and protects the residential characteristics of an area and promotes and encourages a suitable environment for residents of all ages. The R1 zone is intended for low-density single-family homes which are compatible with the existing neighborhood character.

Medium Density Residential (R2). The R2 zone reserves appropriately located areas for a variety of dwelling types at a reasonable range of densities and preserves the desirable characteristics of single-family neighborhoods while accommodating higher densities.

High Density Residential (R3). The R3 zone allows a range of dwelling types at higher densities in appropriate locations and preserves the desirable characteristics of single-family neighborhoods while accommodating higher densities and to ensure adequate light, air, privacy, and open space for each dwelling unit.

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

Exceptions & meaning →

Sec. 26-08-030. - Allowed land uses.

A.

General.

Table 8-1 identifies the allowed uses and permit requirements in the residential zones.

All uses may be subject to additional standards and regulations and may require a zoning permit, design review, or other additional review. Additional regulations that apply to allowed uses are noted in the "use regulations" column in Table 8-1.

If Table 8-1 shows two permit types separated by a slash mark (e.g., "P/C"), this indicates that the permitting level may differ depending upon project conditions, required as described in the use regulations for the allowed use.

B.

Additional Planning Permits.

In addition to the permits identified in Table 8-1 , design review is required for certain projects in compliance with Article 82 (design review), including the following:

a.

All planned developments and condominiums with four (4) or more dwelling units in the RR zone.

b.

All dwelling groups, apartments, and similar residential developments with four (4) or more dwelling units in the R3 zone.

c.

Cottage housing developments, except where there are no exterior changes.

A zoning permit or other permits may be required in addition to those permits identified in Table 8-1 . See individual use regulations sections for additional requirements that may apply.

Table 8-1:Allowed Land Uses in Residential Zones

Key of symbols for Table 8-1:

P = Permitted Use

P* = Permitted Use, subject to discretionary approval criteria

C = Conditional Use

  • = Prohibited Use

† = Permit requirement indicated in use regulations column

Land Use AR RR R1 R2 R3 Use Regulations Zone Zone Zone Zone Zone

Agricultural and Resource-Based Land Use Category

Agricultural Crop Production and Cultivation P P P P P 26-18-020

Agricultural Employee Housing P P P P P 26-18-030

Agricultural Processing C - - - - 26-18-040

Animal Keeping: Beekeeping P P P P P 26-18-070

Animal Keeping: Confined Farm Animals C - - - - 26-18-080

Animal Keeping: Farm Animals P P - - - 26-18-090

Animal Keeping: Pet Fancier P P - - - 26-18-110

Composting, Non-commercial P - - - - 26-18-140

Farm Retail Sales C - - - - 26-18-150

Farm Stands P C - - - 26-18-160

Indoor Crop Cultivation P/C P - - - 26-18-170

Mushroom Farming C - - - - 26-18-200

Nursery, Wholesale P P - - - 26-18-210

Timberland Conversions, Minor P P - - - 26-18-260; 26-88-150

Recreation, Education and Public Assembly Land Use Category

Civic Institution - C C C C 26-22-040

Community Meeting Facilities C C C C C 26-22-050

Country Club C C C C C 26-22-060

Educational Institutions: Colleges and Universities - - C C C 26-22-070

Educational Institutions: Elementary and Secondary C C C C C 26-22-080 Schools

Educational Institutions: Specialized Education and - C - - - 26-22-090 Training

Golf Course C C C C C 26-22-100

Parks and Playgrounds - C C C C 26-22-110

Periodic Special Events P P P P P 26-22-120

Recreation and Sports Facilities: Rural Sports and C - - - - 26-22-160 Recreation

Studios for Art Crafts, Dance, Music - C - - - 26-22-200

Residential Land Use Category

Accessory Dwelling Unit P P P P P 26-24-020; 26-88-060

Congregate Housing, Large C - C C 26-24-040

Congregate Housing, Small - P P P P 26-24-040

Cottage Food Operation P P P P P 26-24-050

Cottage Housing Developments - - P P - 26-24-060; 26-88-063

Dwelling, Multi-Family - - - P P 26-24-070

Dwelling, Single-Family P P P P P 26-24-080

Dwelling, Two-Family - - - P P 26-24-090

Family Day Care Home, Large P P P P P 26-24-100; 26-88-080

Family Day Care Home, Small P P P P P 26-24-100; 26-88-080

Guest House P P P - - 26-24-130

Home Occupation P P P P P 26-24-140; 26-88-121

Junior Accessory Dwelling Unit P P P P P 26-24-150; 26-88-061

Live/Work C C C C - 26-24-160; 26-88-122

Low-Barrier Navigation Center - - - P P 26-24-170

Mobile Home Parks - - C C C 26-24-190; 26-88-100

Permanent Supportive Housing P P P P P 26-24-200

Residential Community Care, Large C C C C C 26-24-210

Residential Community Care, Small P P P P P 26-24-210

Single-Room Occupancy, Small - - - C P 26-24-220; 26-88-125

Single-Room Occupancy, Large C C 26-24-220; 26-88-125

State-Regulated Small Employee Housing P P P P P 26-24-230

Temporary Occupancy of Travel Trailer P P P - - 26-24-240; 26-88-010(n)

Transitional Housing P P P P P 26-24-250; 26-88-127

Retail Land Use Category

Fuel Station, Retail - - - - - 26-26-080

Fuel Station, Non-Retail - - - - - 26-26-081

Nursery, Retail C C - - - 26-26-120

Services Land Use Category

Cemeteries C C - - - 26-28-050

Commercial Horse Facilities C - - - - 26-18-060

Commercial Kennels C - - - - 26-18-070

Day Care Center C C C C C 26-28-080

Homeless Shelter, Small Scale - - C C C 26-28-090; 26-88-127

Horse Boarding P * - - - - 26-18-100

Lodging: Bed and Breakfast (B&B) C C - - - 26-28-130; 26-88-118

Lodging: Hosted Rental P P P - - 26-28-140

Lodging: Vacation Rental P P - - - 26-28-160

Medical Services: Hospitals - - - - C 26-28-180

Veterinary Clinic C - - - - 26-28-230

Transportation, Energy, Public Facilities Land Use Category

Low Temperature Geothermal Resource C C C C C 26-30-050 Development

Public Safety Facilities C C C C C 26-30-090

Public Utility Facilities C C C C C 26-30-100

Renewable Energy Facilities † † † † † † See 26-30-110 and Section 26-88- 200

Telecommunications Facilities † † † † † † See 26-30-120 and Section 26-88- 130

Other Land Uses

Cannabis Cultivation, Personal Use P P P P P 26-88-258

C.

Craft and Garage Sales. In the AR and RR zones, craft sales and garage sales not exceeding two (2) sales days per calendar year provided that prior notification is given to the California Highway Patrol and that adequate off-street parking is provided. Craft sales and garage sales involving three (3) or four (4) sales days per year require a use permit.

D.

Unlisted Land Uses.

For a proposed nonresidential use not listed in the allowed land use table, the Director may determine that the proposed use is equivalent to a permitted or conditionally permitted use if the Director finds that the proposed use is similar to and compatible with a listed permitted or conditionally permitted use.

When the Director determines that a proposed nonresidential use is equivalent to a listed use, the proposed use shall be treated in the same manner as the listed use with respect to development standards, permits required, and all applicable requirements of the Zoning Code.

(Ord. No. 6532, § III(Exh. A), 10-7-2025; Ord. No. 6458, § IV, 12-5-2023; Ord. No. 6444, § VI, 8-22-2023; Ord. No. 6405, § V(Exh. B), 3-14-2023; Ord. No. 6403, 3- 7-2023; Ord. No. 6386, § IV, 8-2-2022; Ord. No. 6335, § III(Exh. A), 2-9-2021)

Exceptions & meaning →

Sec. 26-08-040. - Development standards.

A.

General. Table 8-2 identifies the development standards in the residential zones.

B.

Combining Zones. Properties with a combining zone designation as shown in the zoning database (ex. LG local guidelines combining district) may be subject to addition development standards and design guidelines. Where such designations apply, see the appropriate zoning code section for more information on whether the applicable combining zone may modify the development standards.

Table 8-2:Development Standards - Residential Zones

Key of symbols for Table 8-2:

† = Standard indicated in supplemental standards column

Standard AR RR R1 R2 R3 Supplemental Zone Zone Zone Zone Zone Standards

Acres per Dwelling Unit (min.) 1-20 1-20 N/A N/A N/A 26-08-040.F; 26-16-020

Max. Dwelling Units per Acre (max.) N/A N/A 1-6 6-12 12-20 26-08-040.F; 26-16-020

Lot Size (min. sq. ft.) See 26-08- See 26-08- 6,000 6,000 6,000 26-08-040.G; 26-16-030 040.G 040.G

Lot Width (min. ft.) 80 80 60 60 80

Front Property Line Setback (min. ft.) 30 20 20 20 15 26-08-040.J; 26-16-060

Street Side Property Line Setback (min. ft.) 30 20 20 20 15 26-08-040.J; 26-16-060

Interior Side Property Line Setback (min. ft.) 10 5 5 5 5 26-08-040.J; 26-16-060

Rear Property Line Setback (min. ft.) 20 20 20 20 10 26-08-040.J; 26-16-060

Front Street Centerline Setbacks (min. ft.) 55 45 45 45 45 26-16-060

Side Street Centerline Setbacks (min. ft.) 55 45 45 45 45 26-16-060

Lot Coverage (max.) See 26-08- 35% 40% 50% 60% 26-08-040.I; 26-16-050 040.I.1

Main Building Height (max. ft.) 35 35 35 35 † 26-08-040.H

Accessory Building Height (max. ft.) 35 35 15 35 1 story 26-08-040.H

Multi Family Development Standards † † † † † † See 26-08-050

Parking † † † † † † See Article 86

C.

Affordable Housing. Development standards in this article may be modified for affordable housing and other priority projects in accordance with Article 89 (affordable housing program requirements and incentives).

D.

Cottage Housing. In the R2 and R3 zones, cottage housing developments are subject to the standards in Section 26-88-263 (cottage housing developments).

E.

R2 Multi-Family. In the R2 zone, multifamily developments of five (5) or more units are subject to the high density residential (R3) development standards including those listed in Table 8-2 and additional R3 standards listed in 26-08-040.

F.

Density Standards.

Reduced Density in Residential Zones.

a.

All residential projects shall be designed to meet the minimum density requirements shown in the general plan land use element or on the sectional district maps, whichever is more restrictive.

b.

Nothing set forth in this section shall be construed to prohibit the construction of a single-family dwelling on a single lot of record.

R3 Density Equivalents. In the R3 zone, residential densities are calculated in density unit equivalents shown in Table 8-3 using net parcel area (excluding right-of- way dedications).

Table 8-3:R-3 Residential Density Unit Equivalents

Dwelling Unit Size Density Units

Micro Apt or Studio (<500 sq. ft.) 0.33 density unit

One-bedroom (<750 sq. ft.) 0.5 density unit

Two-bedroom (<1,000 sq. ft.) 0.75 density unit

Three-bedroom 1.0 density unit

Four or more bedrooms 1.5 density units

G.

Lot Size Standards.

AR Zone. The minimum lot size in the AR zone is:

a.

1 acre on lots served by public water; and

b.

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