Sonoma, CA Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- R-M front setback
- 15 ft. one-story, 20 ft. two-story
- MX front setback
- Set case-by-case by planning commission
- Side setback (1-story)
- 5 ft. min., 15 ft. total
- R-M rear setback
- 20 ft. one-story, 25 ft. two-story
- Garage setback
- 20 ft. behind primary structure
Summary
In the City of Sonoma's Northeast Planning Area, a home's required yard setbacks depend on its zoning district: R-M (Residential Medium Density) properties get a 15-foot front setback for a one-story building and 20 feet for two stories, while Mixed Use (MX) parcels have no fixed front setback at all and instead get a case-by-case standard set by the planning commission, per Sonoma Municipal Code § 19.18.020(A)(2).
R-M | MX ... Front/Street-side1 | 15 ft., one-story 20 ft., two-story | A variety of setbacks, consistent with neighborhood conditions, shall normally be required at the discretion of the planning commission. ... Side: One-story | 5 ft. minimum, 15 ft. total. | 5 ft. minimum, 15 ft. total. ... Side: Two-story | 10 ft. minimum on two-story side | 8 ft. minimum on two-story side ... Rear | One-story: 20 ft.; two-story: 25 ft. | One-story: 15 ft.; two-story: 20 ft. ... Garage: Front | 20 ft. from primary structure | 20 ft. from primary structure
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 13-2025, passed December 3, 2025).
Full Breakdown
Title 19 does not set one citywide setback table. 020 Project planning and design section. 020(A)(2) sets a setback table for its R-M and MX zoning districts: the front and street-side setback for R-M is 15 feet for a one-story structure and 20 feet for a two-story structure, while MX properties instead get a variety of setbacks, consistent with neighborhood conditions, required at the discretion of the planning commission, meaning MX has no fixed minimum and is reviewed case by case. Side setbacks for both districts run 5 feet minimum per side with 15 feet total for a one-story wall, rising to 10 feet minimum on the two-story side for R-M and 8 feet minimum for MX.
The rear setback is 20 feet for a one-story R-M structure and 25 feet for two-story, while MX drops to 15 feet one-story and 20 feet two-story, and any detached garage facing the front must sit at least 20 feet behind the primary structure in either district. These numbers apply only within the Northeast Planning Area; the same R-M and MX zoning labels carry different setback figures in the Central-East, Southeast and other planning areas, so the governing table always has to be matched to both the zoning district and the planning area a parcel sits in. 110, which the Table 3-4 language itself cross-references.
Violations & Fines
Building into a required front, side or rear setback without an approved variance or exception is a development code violation the City of Sonoma can pursue through code enforcement, potentially requiring the encroaching portion of the structure to be removed or relocated. Because the Northeast Planning Area's MX setback is set at the planning commission's discretion rather than a fixed number, an MX project without that commission review has no default setback to rely on.
Frequently Asked Questions
What is the front setback for a house in Sonoma's Northeast Planning Area?
Do setback rules change depending on where in Sonoma my property is?
How far back must my garage sit from my house in the Northeast Planning Area?
Sources & Official References
Other rules in Sonoma
California rules heatmap·Compare Sonoma to another location·View the California building setbacks & zoning overview
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Setback Rules in Nearby Cities
How other cities in Sonoma County handle setback rules.