The Authority Having Jurisdiction (AHJ) in California is the government body that reviews your plans, issues your building permit, and inspects the finished work to confirm it meets safety codes. For most projects that means your city or county building department. For a narrower set of buildings, including public schools, hospitals, and state-owned facilities, the AHJ is a specific state agency instead. Getting the right one involved before you finalize drawings is the single biggest factor in avoiding wasted submittals and rework orders.
Who Your AHJ Is
California’s building safety framework runs through Title 24 of the California Code of Regulations, the California Building Standards Code. The California Building Standards Commission adopts and publishes Title 24, setting minimum standards for structural safety, fire protection, accessibility, and energy efficiency.1Division of the State Architect. Overview – Title 24 Building Standards Code as Adopted by the Division of the State Architect Enforcement, though, is handled by different agencies depending on what you’re building.
Local Building Departments
Every California city and county is required to enforce Title 24, and most do it through a building department staffed with plan reviewers and inspectors.2Department of General Services. It’s Your Building Department If you’re adding a room to a house, opening a restaurant, or building an office, that department is your AHJ. Local fire departments or fire districts often act as a secondary AHJ on commercial projects, reviewing sprinklers, alarms, and egress.
State-Level AHJ Agencies
Certain facility types skip local review because a specialized state agency has jurisdiction:
- Division of the State Architect (DSA). Under the Field Act, DSA supervises design and construction of public K-12 schools and community colleges. A district cannot begin construction without DSA’s approval of plans and specifications.3California Legislative Information. California Education Code 17280
- Department of Health Care Access and Information (HCAI), formerly OSHPD. HCAI oversees construction for hospitals and certain other health facilities under Health and Safety Code sections 129675 through 129998.4HCAI. Laws and Regulations
- Office of the State Fire Marshal (OSFM). OSFM is the primary fire and life safety authority for state-owned and state-occupied buildings, including properties leased by the state.5Office of the State Fire Marshal. Fire and Life Safety
One boundary worth flagging: OSFM does not automatically inspect high-rise buildings. Under Health and Safety Code Section 13217, local AHJs perform annual high-rise inspections in their jurisdictions. OSFM only takes over if the local AHJ chooses to hand that responsibility off.6Department of Forestry and Fire Protection. Annual AHJ Letter 2025
Figuring Out Which Agency Applies to Your Project
Two questions decide it: where is the property, and what will it be used for? Projects inside city limits fall under that city. Projects on unincorporated land fall under the county. If the project involves a public school, a licensed hospital, or a state-owned facility, the relevant state agency takes over regardless of address.
Most private residences, retail spaces, restaurants, and offices stay under local jurisdiction from permit through occupancy. The shift to state jurisdiction happens when the intended use triggers a specific statute. A private medical office stays local. A licensed hospital goes to HCAI. A private school is generally local; a public school district project goes to DSA. Submitting to the wrong agency wastes weeks or months, because that agency has no authority to approve the plans in front of it.
What the AHJ Can Decide and Enforce
The AHJ’s authority reaches further than a checklist review. California law gives the building official broad discretion to interpret how codes apply to specific project conditions, including the power to approve alternative materials, methods, or designs when they meet the safety intent of the code. Once plans are approved and a permit is issued, those approved plans lock in the standards for the job.
That protection cuts both ways. Under Health and Safety Code Section 19870, an enforcement agency generally cannot impose new or different building standards during inspection if those standards weren’t in the approved plans, unless there’s a code violation affecting safety, the plans lacked sufficient detail, or the work deviates from what was approved.7California Legislative Information. California Health and Safety Code HSC 19870 Inspectors can’t spring new requirements on you mid-build that should have been raised during plan review.
Local Amendments to Title 24
Cities and counties can adopt local amendments that go beyond the statewide minimums, but only when reasonably necessary because of local climate, geology, or topography. Each amendment requires the governing body’s express finding of need and must be filed with the California Building Standards Commission before it takes effect.8Department of General Services. CBSC Frequently Asked Questions Your local AHJ may enforce stricter requirements than the statewide code, so check with the building department before finalizing plans.
Immunity for Inspection Decisions
Under Government Code Section 818.6, a public entity is not liable for injury caused by its failure to inspect, or by an inadequate or negligent inspection, of property it doesn’t own when the purpose is code compliance or safety.9California Legislative Information. California Government Code 818.6 You cannot sue the city because an inspector missed a defect. Responsibility for building safely rests with the owner and the contractor.
What to Submit
Incomplete submittals are the most common reason permits stall, and most departments won’t begin review until the package is complete. A typical submittal includes:
- Architectural plans: floor plans, elevations, sections, and details at an appropriate scale.
- Structural calculations from an engineer showing the building can handle required loads, which matters in California’s seismic zones.
- Title 24 energy compliance documents showing the project meets California’s Building Energy Efficiency Standards under Title 24, Part 6.10California Energy Commission. Building Energy Efficiency Standards
- Site-specific reports where conditions require them: soils or geotechnical reports, grading plans, environmental assessments.
- Permit application forms with property description, project scope, and estimated construction valuation.
Fees vary widely by jurisdiction and project scope. A minor residential alteration might cost a few hundred dollars; new commercial construction runs into the thousands. As one reference point, Riverside County’s fee schedule lists deposits starting around $3,700 for a single-family dwelling addition and above $11,500 for a new commercial building.11Building and Safety Riverside County TLMA. Building and Safety Fee Schedules Check your own department’s schedule before submitting.
Review, Inspections, and Occupancy
Most California building departments accept submittals through online plan-check portals, though counter submittals still exist. A plan reviewer then examines the drawings against all applicable building, fire, accessibility, and energy codes.
How Long Plan Review Takes
Under AB 2234, local building departments must return a comprehensive set of revision comments within 30 business days of a completed application for residential projects of 25 units or fewer, and within 60 business days for projects of 26 or more units. Complex commercial projects with multiple agency reviews often take longer, especially when comments require redesign. A clean first submittal shortens the total timeline more than anything else you can do.
Field Inspections
Once the permit is issued, construction moves under its conditions. The AHJ requires field inspections at specific milestones: foundation, framing, electrical rough-in, plumbing, insulation, and others depending on the job. Inspectors verify that what’s being built matches the approved plans. Failing an inspection stops work on that portion until corrections are made and the inspector returns.
Certificate of Occupancy
After all required inspections pass, the AHJ issues a Certificate of Occupancy confirming the structure is safe for its intended use and complies with applicable codes. The building should not be occupied or used for its permitted purpose until that document is issued.12Legal Information Institute. California Code of Regulations Title 25, Section 116 – Certificate of Occupancy
Appealing an AHJ Decision
If you believe a building official has misinterpreted a code provision or unfairly rejected your plans, California provides a formal appeals path. Each city and county either designates a local appeals board or, where none exists, the city council or county board of supervisors serves as the appeals board.13California Legislative Information. California Health and Safety Code HSC 17920.5
Grounds typically include a claim that the code was misinterpreted, that the code doesn’t apply to your situation, or that you’re proposing an equally safe alternative. Contact your local building department for the application and filing deadlines, which vary by jurisdiction.
If the local appeal doesn’t resolve it, you can petition the California Building Standards Commission, but CBSC’s authority is limited. The commissioners can only recommend that the local jurisdiction reconsider. They cannot overrule a local decision.8Department of General Services. CBSC Frequently Asked Questions
What Happens if You Skip the Permit
The most immediate consequence is a stop-work order that halts construction until permits are obtained. Many jurisdictions double the permit fee when work has already begun without authorization. The Contractors State License Board can also discipline licensed contractors who perform work without a required local permit, with civil penalties of up to $8,000 per violation, mandatory correction orders, and suspension or revocation of the license.14Contractors State License Board. Building Permit Violation Referral
The cost usually spreads past the fine. Unpermitted work complicates property sales, insurance claims, and refinancing. A buyer’s inspection or a lender’s appraisal that flags unpermitted work can kill a deal or force expensive retrofitting before closing. Pulling the permit up front is almost always cheaper than fixing the problem later.