San Marcos, CA Fire Regulations: Wildfire Zones (2026)
Key Facts
- Code adopted
- 2025 California WUI Code (§17.64.030)
- Single-story setback
- 15 ft from top of slope
- Two-story setback
- 30 ft from top of slope
- Single-story height cap
- Under 12 ft above grade
- Fuel modification zone
- 150 ft from structures (min 100 ft w/ exception)
- Penalty
- Misdemeanor, up to 6 months jail
Summary
Structures in San Marcos's Wildland-Urban Interface zones must clear the top of any slope by a minimum setback under Municipal Code Section 17.64.240, which amends WUI Code Section 608.3. Single-story buildings need 15 feet of horizontal setback from the slope's top edge to the building's farthest projection, and two-story buildings need double that, 30 feet, reflecting the added fire and slope-failure exposure of extra height.
Sec. 608.3 Structure Setback from Top of Slope. Single-story structures shall be setback a minimum 15 feet horizontally from top of slope to the farthest projection from a building or structure. A single-story structure shall be less than 12 feet above grade. A two-story structure shall be setback a minimum of 30 feet horizontally from top of slope to the farthest projection from a building or structure.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 14 Update 1).
Full Breakdown
240. 3, sets a hard setback for any structure built near a slope in a hazardous fire area: a single-story building, defined here as one that rises less than 12 feet above grade, must sit at least 15 feet back from the top of the slope, measured to the building's farthest projection, such as an eave or deck. A two-story structure has to double that distance, setting back a full 30 feet from the top of the slope. The same amended chapter also carries the City's defensible-space rule, requiring an effective fuel modification zone that removes or modifies combustible vegetation within 150 feet of buildings in hazardous fire areas, with narrower exceptions for isolated ornamental plantings and low ground cover more than 30 feet out, and the Fire Authority Having Jurisdiction can reduce that width to no less than 100 feet where fire-resistive construction is used.
Because these setback and fuel-modification rules sit inside the adopted WUI Code rather than a freestanding chapter, they apply automatically to any new construction, addition, or rebuild sited in the City's hazardous fire areas, and the Fire Code Official reviews compliance as part of the building and grading permit process before work can proceed.
Violations & Fines
Building within the required slope setback, or without meeting the WUI Code's structure or fuel-modification standards, is a Fire Code violation enforceable under Chapter 17.64, punishable as a misdemeanor under Section 17.64.290 and Section 1.12.010, with fines set by the City's bail schedule, up to six months in county jail, or both, and each day of noncompliance charged separately.
Frequently Asked Questions
How far back must a house be from a slope in San Marcos's fire hazard areas?
What wildfire code does San Marcos enforce?
Does the slope setback change with building height?
Sources & Official References
Other rules in San Marcos
California rules heatmap·Compare San Marcos to another location·View the California fire regulations overview
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