Shed Installation Permits in Costa Mesa

Local Rule

City of Costa Mesa Economic and Development Services, Building Safety Division; California Building Standards Code Title 24, Part 2, Section 105.2

Costa Mesa administers building permits under the California Building Standards Code, which exempts a one-story detached accessory structure used as a tool or storage shed from a building permit when the floor area does not exceed 120 square feet and the structure has no electrical, plumbing, or mechanical systems; even a smaller shed may still need zoning clearance. Applications are submitted through the city's TESSA online portal, and certain simple projects with a limited scope of work may qualify for the city's Insta-Permit program.

Source · Verified September 2026

Costa Mesa Building Department

Hours and procedures can change — call ahead to confirm.

How This Compares to Orange County

Costa Mesa's own rule is shown above (No permit under 120 sqft). Here is the separate rule that applies at the county level, for context:

Orange County / local code

California's building code lowers the shed exemption to 120 square feet (a 10x12 shed), below the national 200, with a 12-foot height cap. Anything larger, taller, on a permanent slab, or with electrical or plumbing needs a permit. In Orange County the shed must also meet zoning setbacks (commonly 5 feet from side and rear lines) and, in fire-hazard zones, ignition-resistant requirements.

See the full county page

Nearby Cities with Verified Rules

Other cities near Costa Mesa with a confirmed shed installation rule:

FAQs

Building It Yourself? Here's What You'll Need

Popular tools and materials homeowners use for a shed installation project:

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