Sonoma, CA Building Setbacks & Zoning: Structure Height Limits (2026)
Key Facts
- Governing section
- SMC 19.40.040(A)
- Measurement method
- Finished grade to parallel plane, not always ridge
- Roof equipment allowance
- +5 ft., capped at 25% of roof area
- Chimney/antenna allowance
- +8 ft. above the limit
- 3rd-floor housing bonus
- 36 ft. via SMC 19.54.050 exception
- Hillside sites
- Separate rules under SMC 19.40.050
Summary
The City of Sonoma caps building height by zoning district and measures it from finished grade to a parallel plane rather than to the roof ridge in most cases. SMC 19.40.040 sets the measurement method and lists the only exceptions: extra height for rooftop equipment, chimneys, antennas, and a discretionary third-floor housing bonus.
A. Maximum Height. ... The height of structures shall not exceed the standards established by Division III of this title, Project Design. The maximum height shall be measured as the vertical distance from the finished grade of the site to an imaginary plane located the allowed number of feet above and parallel to the grade. ... ... B. Exceptions to Height Limits. Exceptions to the height limits for structures shall apply in the following manner: 1. Third-Floor Residential Units. Within the commercial, gateway commercial, and mixed use zoning districts, a maximum height of 36 feet may be allowed in order to accommodate a third floor of multifamily residential development. ... ... 2. Elevator Penthouses and Other Roof-Mounted Structures. Roof-mounted structures for the housing of elevators, stairways, tanks, ventilating fans, or similar equipment shall be allowed, up to a maximum of five feet above the allowed structure height. The total square footage of all structures above the allowed height shall not exceed 25 percent of the total roof area of the main structure. 3. Chimneys, Spires, Antennas, Etc. Chimneys, flag poles, antennas and similar structures shall be allowed, up to a maximum of eight feet above the allowed structure height.
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
040 is the citywide rule for how height is measured and where limits can be exceeded; the actual numeric maximum for a parcel comes from the zoning district table in Division III of Title 19. In the Downtown district, for example, the Commercial zone allows 35 feet and the Residential-Low, Residential-Medium, Residential-Housing Opportunity, and Mixed Use zones allow 30 feet, while other planning areas set their own residential caps, generally 30 feet. Height is measured under subsection (A) as the vertical distance from finished grade to an imaginary plane parallel to the grade, located the allowed number of feet above it, not simply to the highest point of the roof.
050 instead. Subsection (B) lists three specific exceptions to whatever numeric limit applies. 050, not by right. Second, roof-mounted equipment enclosures for elevators, stairways, tanks, or ventilation fans can rise up to five feet above the allowed height, capped at 25 percent of the total roof area. Third, chimneys, flagpoles, and antennas can extend up to eight feet above the limit. 050 exception approved by the review authority; there is no administrative path around the base numeric limit.
Violations & Fines
A structure built or maintained above its allowed height without an approved exception is declared a public nuisance and a misdemeanor under SMC 19.90.040, enforceable by the city planner under SMC 19.90.030 and, outside office hours, by the police department. The city can issue a stop-work order on the excess construction and pursue abatement costs against the owner under SMC 19.90.100, in addition to any misdemeanor conviction.
Frequently Asked Questions
Is Sonoma's building height measured to the roof ridge?
Can I build taller than my zone's height limit to add a chimney or antenna?
How do I get approval to build a third residential floor above the height limit?
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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Structure Height Limits in Nearby Cities
How other cities in Sonoma County handle structure height limits.