Costa Mesa, CA Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- Front setback (all residential zones)
- 20 feet
- Interior side setback
- 5 feet
- Rear setback, 2-story (R1)
- 20 feet
- Rear setback, 1-story (R1)
- 10 feet
- Small accessory structure setback
- Zero, if under 6.5-15 ft tall
- Governing section
- Costa Mesa Municipal Code § 13-32
Summary
Table 13-32 sets a uniform 20-foot front setback across every residential zone in Costa Mesa, plus a 5-foot interior side setback and a rear setback of 20 feet for two-story homes or 10 feet for one-story homes. Small accessory structures can drop to a zero side or rear setback under listed height limits.
SETBACKS FOR MAIN BUILDINGS AND ACCESSORY BUILDINGS AND STRUCTURES (Minimum distances given, unless otherwise noted. All setbacks from streets are measured from the ultimate property line shown on the master plan of highways). Front 20 feet Side Interior property line: 5 feet. Note: Accessory structures that do not exceed 6 1/2 feet in height in the R1 zone or 15 feet in height in the other residential zones may have a zero side setback. Property line abutting a public street: 10 feet. ... Property line abutting an alley: 5 feet Rear (not abutting a publicly dedicated alley) 20 feet for 2 story structures. 10 feet for 1 story structures (15 foot maximum height) provided that maximum rear yard coverage is not exceeded.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4894290; v9 updated 2025-11-18).
Full Breakdown
Under Municipal Code § 13-32's residential development standards table, the front setback is 20 feet in the R1, R2-MD, R2-HD, and R3 zones alike, measured from the ultimate property line shown on the master plan of highways rather than the current curb line. 5 feet in the R1 zone, or 15 feet in the other residential zones, may sit right on the property line with a zero side setback. A side property line abutting a public street needs a 10-foot setback, and one abutting an alley needs 5 feet.
Rear setbacks depend on building height: two-story structures need 20 feet in R1 (15 feet in R2-MD/R2-HD/R3), while one-story structures capped at 15 feet need only 10 feet, provided the rear yard coverage limit isn't exceeded. 5 feet in R1, 15 feet elsewhere) can drop to a zero rear setback except on corner lots in the R2 and R3 zones, where accessory structures must instead meet the full main-structure setback. Corner lots carry an added rule: where a corner lot's rear property line adjoins a neighbor's side property line, no detached accessory structure is allowed on that corner lot except in the rear quarter farthest from the side street. Bluff-top lots carry a separate 10-foot setback from the bluff crest under § 13-34.
Violations & Fines
Constructing within a required setback without approval is a zoning violation under § 13-16, enforceable as an infraction (fines of $100 for a first offense, $200 for a second, $500 thereafter within a year) or as a misdemeanor punishable by up to $1,000 and six months in jail under § 1-33. The development services director can also require removal or relocation of an encroaching structure, and the city attorney may pursue civil abatement.
Frequently Asked Questions
What is the front yard setback in Costa Mesa's residential zones?
Can I build a shed right on my side property line?
How close to my rear property line can I build a two-story addition?
Sources & Official References
Other rules in Costa Mesa
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