Costa Mesa, CA Building Safety: Building Permits (2026)
Key Facts
- Permit authority
- Development services director, Section 5-10
- Application requirement
- Full value of work stated, Section 5-9
- Fence exemption
- Wood/steel/vinyl/iron 6 ft or under; masonry 3 ft or under
- Pool exemption
- Above-ground, under 18 in deep, 5,000 gallons max
- Deck exemption
- 200 sq ft or less, 30 in high max, unattached
- Violation class
- Misdemeanor, separate offense each day
Summary
Costa Mesa requires a building permit for most construction under Municipal Code Section 5-10, issued by the development services director once an applicant meets all requirements. Section 5-1.1(d) exempts only specific small projects, such as fences under 6 feet, above-ground pools under 5,000 gallons and 18 inches deep, and decks under 200 square feet that stay below 30 inches and are unattached to the dwelling.
Section 105.2 is revised by amending exception 2, 9, and adding 14 as follows: 2. Wood, Steel, Vinyl, or Iron fences not over 6 feet in height. Stucco, concrete, and masonry brick fences not over 3 feet high. 9. Prefabricated swimming pools accessory to a Group R-3 occupancy that are less than 18 inches (457.2 mm) deep, do not exceed 5,000 gallons (18,927.059 L) and are installed entirely above ground. 14. Decks not exceeding 200 square feet (18.58 m2) in area, that are not more than 30 inches (762 mm) above grade at any point, are not attached to a dwelling and do not serve the exit door required by Section R311.2.
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
Section 5-10 authorizes the development services director or a designee to issue building permits under Title 5 whenever the applicant has complied with all the title's requirements, and Section 5-9 requires the applicant to state the full value of the building, structure, or alteration on the permit application, including the value of any labor or materials the owner supplies. 2 exceptions to define what Costa Mesa treats as exempt from a permit: wood, steel, vinyl, or iron fences not over 6 feet high, and stucco, concrete, or masonry brick fences not over 3 feet high; prefabricated above-ground swimming pools for a single-family home that are less than 18 inches deep and hold no more than 5,000 gallons; and decks no larger than 200 square feet that sit no more than 30 inches above grade, are not attached to a dwelling, and do not serve a required exit door.
Anything larger or structurally different than these listed exceptions needs a permit. Additions, alterations, and changes of use must comply with the same construction code provisions as new buildings under Section 5-2(c), and where sections of the adopted codes conflict, the most restrictive requirement governs under Section 5-2(d).
Violations & Fines
Erecting, constructing, enlarging, altering, or occupying a building or structure in violation of Title 5, including working without a required permit, is unlawful under Section 5-6 and is a misdemeanor, with each day the violation continues charged as a separate offense. The city attorney can commence civil or criminal proceedings to abate the violation once a notice and order becomes final, and the property owner is liable for abatement costs, including attorney's fees and court costs.
Frequently Asked Questions
Do I need a permit to build a fence in Costa Mesa?
Can I install an above-ground pool without a permit?
Does my new deck need a building permit?
What information does a Costa Mesa building permit application need?
Sources & Official References
Other rules in Costa Mesa
California rules heatmap·Compare Costa Mesa to another location·View the California building safety overview
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