Building Safety in Costa Mesa, CA

Costa Mesa maintains 134 local ordinances across all categories, and 7 of those deal specifically with building safety. Here is a breakdown of what the city actually requires, what is prohibited, and where Costa Mesa falls on the strict-to-permissive spectrum compared to other cities.

Plumbing Permits

Costa Mesa requires plumbing work to comply with the California Plumbing Code, 2025 Edition, based on the 2024 Uniform Plumbing Code, adopted city-wide under Municipal Code Section 5-1. The development services director issues plumbing permits and enforces the code, and permit fees only take effect once the city council adopts them by resolution under Government Code Sections 66016 and 66020.

Key details: Adopted code: California Plumbing Code 2025, based on 2024 UPC. Enforcing official: Building official / development services director. Permit issuance: Section 5-10, once applicant meets all requirements. Conflict rule: Most restrictive code provision governs, Section 5-2(d). Fee effective date: Only after council resolution, Gov. Code sections 66016, 66020.

Unlawful plumbing work, meaning work that violates the adopted Plumbing Code, falls under Section 5-6: any person who erects, constructs, alters, or maintains a structure or its plumbing system contrary to the title is guilty of a misdemeanor, with each day of continued violation a separate offense. Deputies can cite violations as a misdemeanor or infraction under Section 1-33.1, and the city attorney can bring abatement proceedings once a notice and order is final, recovering costs and fees from the owner.

Electrical Permits

Costa Mesa enforces the California Electrical Code, 2025 Edition, based on the 2023 National Electrical Code, for all electrical work in the city under Municipal Code Section 5-1. The development services director issues electrical permits and enforces the adopted code, and permit fees only take effect once the city council approves them by resolution under Government Code Sections 66016 and 66020.

Key details: Adopted code: California Electrical Code 2025, based on 2023 NEC. Enforcing official: Building official / development services director. Permit issuance: Section 5-10, once applicant meets all requirements. Fee effective date: Only after council resolution, Gov. Code sections 66016, 66020. Violation class: Misdemeanor, separate offense each day.

Performing electrical work, or occupying a structure with electrical work, that violates the adopted Electrical Code is unlawful under Section 5-6 and is a misdemeanor. Every day a violation continues counts as a separate offense. The development services director and deputies are designated enforcement officials with authority to issue citations as either a misdemeanor or an infraction under Section 1-33.1, and the city attorney can pursue civil or criminal abatement once a notice and order becomes final, with abatement costs and attorney's fees recoverable from the property owner.

Building Permits

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.

Key details: 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.

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.

Lead Paint

Costa Mesa developers building small lot subdivisions must disclose lead-based paint and other construction hazards to future homebuyers before a sales agreement is signed, under Municipal Code Sec. 13-42.3(c). The rule sits within a broader buyer-disclosure list covering insulation, soils, schools, and resale restrictions.

Key details: Governing section: Sec. 13-42.3(c)(2). Applies to: Small lot subdivisions, 15 lots or fewer. Trigger: Before sales agreement signed. Disclosure items: 14, including lead paint & asbestos. Reviewing body: Planning division.

Selling, leasing, or conveying a lot in a small lot subdivision without complying with the article's provisions, including the buyer disclosure requirement, is prohibited under Sec. 13-40(b) and is enforceable under Sec. 1-33 as an infraction (escalating fines to $500) or a misdemeanor (up to $1,000 fine and six months in jail).

If you are coming from a city with tighter rules, you will find Costa Mesa gives residents more flexibility on lead paint.

Door Locking Hardware

When an apartment building converts to a residential common interest development in Costa Mesa, Sec. 13-42(h)(3) forces the property to meet security minimum construction standards before recordation, including deadbolt locks on every unit door and a ban on security grilles that block required bedroom egress windows.

Key details: Governing section: Sec. 13-42(h)(3). Applies to: Apartment-to-condo conversions. Door hardware: Appropriate deadbolt locks required. Egress window rule: No grille blocking bedroom escape windows. Enforcement: Building official final inspection.

Recording a common interest development conversion, or selling units, before the Sec. 13-42(h) security and life-safety improvements including deadbolt locks are inspected and approved by the building official is prohibited under Sec. 13-40(b), and violations of the Municipal Code are enforced under Sec. 1-33 as infractions with escalating fines up to $500, or as a misdemeanor with a fine up to $1,000 and up to six months in jail.

Building Inspections

Before selling a residential building with four or more units, Costa Mesa owners must obtain a Report of Residential Building Records under Municipal Code Section 5-118, and if the owner consents, Section 5-122 requires the city to physically inspect the building and record any building, housing, or zoning code violations found in that report.

Key details: Applies to: Residential buildings with 4 or more dwelling units. Trigger: Entering an agreement of sale. Application deadline: Within 3 days of the sale agreement. Report timeline: City issues report within 30 days. Inspection: Only if owner consents, adds inspection fee.

Section 5-126 makes an owner who violates Chapter VIII's report and inspection requirements subject to the offenses and penalties in Section 1-33 of the code. Section 5-125 also allows the city to charge an inspection or reinspection cancellation fee, set by council resolution, when an owner misses a scheduled inspection appointment or cancels it, and no application fee is refundable once a property inspection under this chapter has occurred.

Green Building Code

Costa Mesa mandates compliance with the 2025 California Green Building Standards Code, adopted city-wide under Municipal Code Section 5-1 alongside the rest of the construction codes. The building official enforces the code for new and altered buildings, and, as with every adopted code, permit fees for green building compliance review only take effect once the city council approves them by resolution.

Key details: Adopted code: 2025 California Green Building Standards Code (CALGreen). Enforcing official: Building official / development services director. Local amendments: None beyond base adoption in Section 5-1. Conflict rule: State regulation prevails over local amendments. Fee effective date: Only after council resolution, Gov. Code sections 66016, 66020.

A building or structure built, altered, or occupied contrary to the adopted Green Building Standards Code violates Section 5-6 and is a misdemeanor, with each day the violation continues treated as a separate offense. The development services director's deputies can issue citations as a misdemeanor or infraction under Section 1-33.1, and once a notice and order is final, the city attorney may bring civil or criminal proceedings and recover abatement costs and attorney's fees from the owner.

The Bottom Line

Costa Mesa's building safety rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Costa Mesa is broadly strict or permissive.

All of the above reflects Costa Mesa's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.