Casa Grande Adopted Building Codes: The 2018 I-Codes That Apply to Your Build

Your home in the City of Casa Grande is checked against a stack of national model codes that the City Council voted to adopt by reference, then edited for local desert conditions. Casa Grande sits in Pinal County, not Maricopa, so the city is its own permit office and its own code authority. This page lists the codes Casa Grande actually enforces today, where they live in the City Code, and the resolution that adopted them.

Which codes Casa Grande enforces

Casa Grande adopted the 2018 family of International Codes (often called I-codes) for most construction, plus the 2017 electrical code. They are written into Title 15 of the City Code, chapter by chapter. Here is the current list the city's Building Division enforces:

• 2018 International Residential Code (IRC): one- and two-family homes and townhouses. This is the main code for a custom house.
• 2018 International Building Code (IBC), with Appendices C and I: larger and commercial structures.
• 2018 International Plumbing Code (IPC): water supply, drains, and fixtures.
• 2018 International Mechanical Code (IMC): heating, cooling, and ventilation.
• 2018 International Fuel Gas Code (IFGC): gas piping and gas appliances.
• 2018 International Energy Conservation Code (IECC): insulation, windows, and HVAC efficiency.
• 2018 International Fire Code (IFC): fire and life-safety provisions.
• 2017 National Electrical Code (NEC): all wiring and electrical work.

The IRC is the code a single-family builder lives in day to day. The City of Casa Grande is the authority having jurisdiction (AHJ) that adopts, amends, and enforces these codes, so its Building Official, not Pinal County and not the state, has the final word inside city limits.

Casa Grande also runs a local administrative layer on top of the I-codes. The City of Casa Grande Building and Technical Administrative Code, 2019 Edition sets the rules for permits, fees, inspections, and the Building Official's authority. It is the procedural spine that ties the technical codes together.

What the City Code says

Each code is adopted by reference in its own chapter of Title 15. The building code chapter, Section 15.08.010, states the adoption plainly:

The International Building Code, 2018 Edition, including Appendices C and I, and the City of Casa Grande Amendments to the International Building Code, 2018 Edition, copies of which were made a public record by Resolution No. 5170 of the City of Casa Grande, Arizona, are hereby adopted by reference.

The same pattern repeats for the IRC, IPC, IMC, IFGC, IECC, IFC, and the 2017 NEC, each adopted by reference and then changed by Casa Grande's local amendments on file with the City Clerk. So the rule you build to is the published 2018 edition (2017 for electrical) as modified by the city's amendments for that code.

When this comes into play

The edition controls real decisions from day one of design:

• Your framing, bracing, and foundation details follow the 2018 IRC as amended. A plan drawn to a newer 2021 or 2024 set may carry details Casa Grande's adopted code does not require or match, and the reviewer checks against the 2018 text.
• Outlet spacing, arc-fault and ground-fault protection, and panel sizing follow the 2017 NEC. An electrician working from a 2020 or 2023 code book is ahead of what Casa Grande adopted, which is usually fine but should be confirmed against the 2017 base.
• Energy compliance runs on the 2018 IECC as amended. You still have to hit the 2018 insulation, duct, and window numbers, even if newer Phoenix-metro cities are on a tighter energy code.

For example, suppose you submit a 2,400 square foot custom home plan in Casa Grande in 2026. The plan reviewer checks your framing against the 2018 IRC, your wiring against the 2017 NEC, your gas piping against the 2018 IFGC, and your energy sheet against the 2018 IECC. If your designer reused a set drawn to Scottsdale's 2021 codes, several editions will not line up, and the plan can come back with corrections before a permit issues. Edition is tied to the code in effect for your permit, not the newest book on the shelf.

What this means for you

Hand your designer, structural engineer, and trades one clear instruction. Build to Casa Grande's 2018 I-codes and the 2017 NEC, with the city's amendments applied. That single sentence prevents the most common and expensive plan-review correction, which is a sheet drawn to the wrong edition or to a different city's newer code. Because Casa Grande is in Pinal County, do not assume a Maricopa-metro plan set carries over without a check.

This entry is the anchor for the rest of the Casa Grande building-codes module. From here, see Casa Grande Residential Building Permit Requirements for how these codes get checked during plan review and what you file to get a permit. If your lot is on septic or a private well, that side runs through Pinal County and the state, not the city, so confirm onsite wastewater with the Pinal County Aquifer Protection Division and wells with the Arizona Department of Water Resources. For the bigger picture, see the steps to building a custom home in Arizona .

Source

The adopted codes, the editions, and the adopting resolution are written into the codified City Code: Casa Grande City Code Title 15 on American Legal Publishing . The city's plain-language building information is published by the City of Casa Grande Building Division . Arizona's broader adoption picture is tracked by the code authors at ICC Code Adoptions for Arizona .

This page is general information, not a code interpretation. Editions and amendments change, so confirm the current adopted code and any project-specific amendment with the Casa Grande Building Division before you rely on a specific edition.