Arizona building codes are not set or enforced at the state level. Instead, each city and county adopts its own version of the model codes published by the International Code Council (ICC) and enforces them through a local building safety department. That means the edition of the code that applies to your project, the permit fees, the inspection schedule, and even whether codes apply at all can change depending on which side of a jurisdictional line your property sits on. The first phone call for any construction project in Arizona should be to your local building department.
Which ICC Codes Arizona Jurisdictions Use
Most Arizona cities and counties build their regulations on ICC model codes. The 2018 International Building Code (IBC) is the most widely adopted edition for commercial and multi-family buildings. For single-family homes and townhouses, the ICC’s adoption map lists the 2009 International Residential Code (IRC) as the statewide reference point, though many local jurisdictions have adopted newer editions.1International Code Council. Arizona Maricopa County, for instance, references the 2018 IBC for its permit rules, indicating a more recent adoption than the state-level baseline.2Maricopa County, AZ. Expired Permits
The ICC has since published a 2024 edition of both the IBC and IRC. Whether your jurisdiction has adopted it depends on the local code adoption process, and adoption tends to lag publication by several years. Before you design a project, confirm the exact code year your city or county enforces so your plans meet the right edition.
Why Your Local Jurisdiction Controls Everything
Building code enforcement in Arizona is delegated to cities and counties. Each runs its own building safety office responsible for plan review, permitting, and inspections. Public buildings located in areas that haven’t adopted local codes must follow the state fire code and the building codes used by the largest city in that county.3Arizona Legislature. Arizona Code 34-461 – Applicability of Local Codes Exceptions Definition
Local governments can amend the base ICC codes to address regional conditions like extreme heat, monsoon flooding, or expansive soils.4Arizona Building Officials. AZ Codes One city might require upgraded wind-resistance details that its neighbor does not. Some unincorporated rural areas have minimal or no residential building codes at all. If you’re building outside city limits, contact the county development services office to find out whether codes apply. Without adopted codes you face fewer regulatory requirements, but you also lose the inspection safety net, and lenders and insurers may balk at a structure that was never inspected.
When You Need a Building Permit
A permit is required for any work that changes a structure’s framing, foundation, electrical wiring, plumbing, or mechanical systems. That covers new construction, additions, removing load-bearing walls, installing a new HVAC system, and running new plumbing lines.5Sahuarita, AZ – Official Website. Do I Need a Building Permit Swimming pools, retaining walls taller than about four feet, and masonry walls over six feet usually need permits too.
Cosmetic work generally does not. Painting, replacing a faucet, installing flooring, and hanging wallpaper are common examples. In county jurisdictions, Arizona law exempts repairs or improvements valued at $500 or less from the zoning permit requirement.6Arizona Legislature. 2025 Arizona Revised Statutes Title 11 – Counties 11-815 That threshold doesn’t stretch far once materials are involved, so most real renovation projects will still need a permit.
Fences are a common trap. Some jurisdictions exempt wood, vinyl, or wrought-iron fences up to seven feet and masonry walls up to six feet; others cap all fence types at six feet.7Sahuarita, AZ – Official Website. Do I Need a Building Permit – Section: Building Permit Not Required Call your local building department before starting. A quick phone call is cheaper than a stop-work order.
Accessory Dwelling Units Under SB 1415
Arizona’s SB 1415, passed in 2024, changed the rules for accessory dwelling units (casitas or guest houses). Every municipality with a population over 75,000 had to adopt regulations allowing at least one ADU on any lot zoned for single-family housing by January 1, 2025. Cities that missed the deadline must allow ADUs on all residential lots without limits.8Arizona Legislature. SB 1415
The law also limits what cities can require of ADU projects. Municipalities cannot demand extra parking, force the ADU to match the main home’s exterior design or roof pitch, impose setbacks greater than five feet from rear or side property lines, or apply restrictions more burdensome than those on single-family homes in the same zone. An ADU can be up to 75 percent of the main home’s floor area or 1,000 square feet, whichever is smaller.8Arizona Legislature. SB 1415
SB 1415 does not override building codes, fire codes, or public health regulations, so your ADU still has to be built to code and pass inspections. Cities cannot force an ADU to comply with commercial building codes or require a fire sprinkler system. If your municipality has fewer than 75,000 residents, SB 1415 doesn’t apply and existing local zoning controls whether an ADU is allowed.
How the Permit Process Works
Start by contacting your local building safety department for the application forms and document checklist. You’ll need your property’s Assessor’s Parcel Number (APN) from the county assessor, along with a legal description of the property, the scope of work, and the names and license numbers of the contractors involved.9Arizona Building Officials. Permit Information – Section: Where Do I Get My Permit?
Construction documents go in with the application. A bathroom remodel might need only a basic layout and fixture schedule, while a new home requires full architectural drawings, a site plan showing the building’s footprint, and sometimes structural engineering calculations.10Arizona Building Officials. Permit Information Incomplete plans are the single most common cause of delay. Ask upfront exactly what’s required so you don’t burn a review cycle.
Permit Fees
Fees are calculated from the project’s estimated construction value, and each jurisdiction sets its own schedule. In Phoenix, a project valued between $10,001 and $50,000 pays a base fee of $303 on the first $10,000 plus $10 for each additional $1,000. A $50,001 to $200,000 project starts at $703 plus $9 per additional $1,000.11City of Phoenix. PDD Fee Schedule Phoenix swimming pool permits start at a $234 minimum with a $30 aquatics program surcharge, and solar photovoltaic permits run from about $293 to $780. Check your city or county for the schedule that applies to you.
Plan Review and Timelines
After you submit, the department reviews your plans for code compliance. Phoenix targets 28 days for the initial review and 21 days for resubmittals. Smaller jurisdictions vary with staffing. Expect two to three rounds of comments on larger projects before final approval; resubmittals typically move faster than the first review.
Permit Expiration
A building permit expires if construction doesn’t begin within 180 days of issuance, or if work stops for 180 consecutive days after it has started. Maricopa County, following Section 105.5 of the 2018 IBC, allows one free 180-day extension if you submit a written request before the permit expires.2Maricopa County, AZ. Expired Permits Passing or failing an inspection with substantial progress during the extension resets the clock for another 180 days. If a permit lapses you pay for a new one, and if the codes have been updated in the meantime your plans may need revisions to meet the current edition.
Inspections and Final Approval
Once your permit issues, scheduling inspections at each required stage is on you. Common inspection points include footings, framing, electrical wiring, plumbing rough-in, gas lines, roofing, HVAC, and drywall.12City of Buckeye. Inspections Inspections must happen before you cover or conceal the work, so don’t close up a wall before the framing inspection passes.13City of Phoenix. Building Construction Inspections
If an inspector finds a problem, you receive a correction notice. Work in that area stops until you fix the issue and pass a re-inspection. Most jurisdictions require at least 24 hours’ notice when scheduling, so plan ahead.
After every required inspection passes, the building official issues a Certificate of Occupancy for new construction or a final approval for a renovation permit. This confirms the structure meets code and is legally ready to occupy. Until that final sign-off happens the permit is not truly closed, and occupying or using a building before then can trigger enforcement action.12City of Buckeye. Inspections
Contractor Licensing and the Owner-Builder Exemption
Arizona law requires a contractor’s license for any project where the total cost of labor and materials exceeds $1,000, or where the local municipality requires a permit.14Arizona Registrar of Contractors. Contracting in Arizona Heres What You Need to Know The Arizona Registrar of Contractors (ROC) handles licensing and complaints. Verify a contractor’s license status on the ROC website before hiring.
If you own the property and plan to live in it, you can do your own work without a contractor’s license under an owner-builder exemption. The exemption applies only when the property is for your personal occupancy and not intended for sale or rent. Selling or renting within one year of completion creates a legal presumption that you built it for that purpose, which voids the exemption.15Arizona Legislature. Arizona Code 32-1121 – Persons Not Required to Be Licensed Penalties Applicability You can hire licensed contractors or use your own employees, but you cannot hire unlicensed people to act as contractors.
The exemption removes the license requirement, not the code requirement. You still have to pull permits and pass every required inspection. Electrical, plumbing, and structural work by a homeowner is held to the same standards as work by a licensed pro.
What Happens If You Skip the Permit
Building without a required permit in a county jurisdiction is a class 2 misdemeanor, and each day the violation continues counts as a separate offense.6Arizona Legislature. 2025 Arizona Revised Statutes Title 11 – Counties 11-815 Counties can pursue civil penalties up to the maximum fine for a class 2 misdemeanor, and neighboring property owners who are directly harmed can seek an injunction to stop the work or force its removal. Municipal penalties vary but follow similar patterns.
The legal penalties are often the smallest part of the problem. Insurance companies routinely deny claims tied to unpermitted work. An electrical fire in an unpermitted addition gives your insurer a strong argument that the work was never inspected and wasn’t built to code. Some insurers cancel policies or refuse renewal if unpermitted construction turns up during a claim investigation.
Selling is where unpermitted work usually catches up with owners. Arizona’s widely used Seller’s Property Disclosure Statement asks about improvements, and failing to disclose unpermitted work creates liability after closing. Buyers who find unpermitted additions demand price reductions, and some walk away entirely. Getting the work permitted after the fact usually means opening walls so inspectors can verify what’s inside, which can cost far more than the original permit would have.
If a building department catches unpermitted construction in progress, expect a stop-work order. You’ll apply for a permit after the fact, and many jurisdictions add a penalty fee on top of the standard cost. The department may require you to expose completed work for inspection, which can mean tearing out finished drywall, flooring, or other materials you have already paid for.