What building codes apply in Scottsdale, Arizona?

A home built in Scottsdale is checked against the 2021 family of International Codes (often called I-codes) plus the 2020 National Electrical Code, all adopted and amended by the City Council. The main code for a custom house is the 2021 International Residential Code (IRC). Scottsdale's building and fire codes took effect January 1, 2023, with the energy pieces effective January 7, 2023. The city, not the state, enforces these inside city limits, and it edits each model code with local amendments before it applies them.

Which codes Scottsdale enforces

Scottsdale enforces the 2021 I-codes for nearly everything and the 2020 electrical code. Here is the working list for a single-family build:

• 2021 International Residential Code (IRC): one- and two-family homes and townhouses. This is the code a custom-home builder lives in day to day.
• 2021 International Building Code (IBC): larger and commercial structures.
• 2021 International Energy Conservation Code (IECC): insulation R-values, window U-factors, duct sealing, and HVAC efficiency.
• 2021 International Plumbing Code (IPC): water supply, drains, and fixtures.
• 2021 International Mechanical Code (IMC): heating, cooling, and ventilation.
• 2021 International Fuel Gas Code (IFGC): gas piping and gas appliances.
• 2020 National Electrical Code (NEC): all wiring and electrical work.

The City of Scottsdale is the authority having jurisdiction (AHJ) for these codes. That term means the body with legal power to adopt, amend, and enforce the rules. In Scottsdale, that is the city building official, so the final word on your plans comes from city staff, not from Maricopa County or the state. For the full breakdown of editions, effective dates, and where the amendment PDFs live, see our reference page on Scottsdale's adopted building codes.

What an "adopted code edition" means for you

An adopted code edition is the specific year-version of a model code that a city has voted into law, and it sets the exact rules your house must meet. The International Code Council publishes new editions every three years (2018, 2021, 2024). A city does not automatically use the newest book. It votes to adopt a chosen edition, then enforces that one until it adopts a newer one. Scottsdale adopted the 2021 cycle, so a 2021 rule controls your build even though a 2024 book exists.

This matters because editions differ in real, buildable ways. A 2018 energy code and a 2021 energy code can call for different insulation, different duct-leakage limits, and different window ratings. The 2020 NEC requires arc-fault and ground-fault protection in places older code books did not. If your designer copies a sheet from an older project, the numbers may not match Scottsdale's 2021 requirements, and plan review will send it back with corrections before a permit issues.

Scottsdale is direct about why the raw model code is not the whole story:

Building codes are adopted and amended by City Council to account for local conditions and practices.

So the rule you actually build to is the published 2021 edition as changed by Scottsdale's amendment document for that code. Those local edits are the tie-breaker. Your designer reads them alongside the base code, not instead of it.

Local amendments cover the things a desert city cares about most. Scottsdale layers them on top of each 2021 code. They are short, but they control real choices on your plans. A few common areas they touch:

• Energy and green building. Scottsdale added amendments to the 2021 IRC and IECC, and its green construction code rules became mandatory July 1, 2023. These shape your insulation, duct sealing, and efficiency paperwork.
• Fire and life safety. The fire code amendments set rules for access, water supply, and fire-rated assemblies. They can affect driveway width and hydrant spacing on larger lots.
• Grading and drainage. Hillside and wash rules matter in north Scottsdale. They shape where the house can sit and how the lot must drain.
• Administrative items. Permit fees, inspection steps, and submittal rules live in the amendments too.

Each model code has its own separate amendment document. You do not read one master file. You read the amendment PDF that matches each code your house uses. The base book plus that PDF together form the rule.

Why Scottsdale differs from its neighbors

Scottsdale sits in the middle of the Phoenix metro's wide code range, which spans the 2018 edition to the 2024 edition across nearby cities, and that gap is the single biggest reason a plan that passes in one city can fail in another. Each city adopts on its own schedule, so neighbors land on different editions:

• Phoenix moved to the 2024 I-codes and 2023 NEC (effective August 1, 2025), one cycle ahead of Scottsdale.
• Cave Creek moved to the 2024 codes and 2023 NEC effective January 1, 2026, though it keeps the 2018 residential energy code.
• Fountain Hills moved to the 2024 codes and 2023 NEC for permits filed on or after September 1, 2025.
• Carefree still runs the 2018 I-codes and 2017 NEC, a full cycle behind Scottsdale.
• Unincorporated Maricopa County (including Rio Verde Foothills) uses the 2018 I-codes and 2017 NEC.

That spread means a wiring plan drawn to the 2023 NEC for a Phoenix lot is not automatically right for a Scottsdale lot on the 2020 NEC, and a 2018 energy sheet from a county build will not meet Scottsdale's 2021 energy code. The city line decides the code, not the metro. The fix is simple: design to the edition of the city where the lot actually sits.

How to confirm the current code with the city

Confirm the adopted edition directly with Scottsdale Planning and Development before you finalize plans, because editions and amendments change. The city publishes its adopted codes, effective dates, and per-code amendment documents on its Building Code Information page. Arizona's broader adoption picture, city by city, is tracked by the code authors at the ICC Code Adoptions map for Arizona.

One timing rule saves real money. Your code edition is tied to when the permit was issued, not today's calendar. If you pulled a permit before the January 2023 effective dates, your project may still run under the prior edition. Going forward, anything new in Scottsdale runs on the 2021 codes and the 2020 NEC. When you pull a permit, the office can confirm exactly which edition and which amendments apply to your address.

What a builder must design to

Give your designer, structural engineer, and trades one clear instruction: build to Scottsdale's 2021 I-codes and the 2020 NEC, with the city amendments applied. That single sentence prevents the most common and most expensive plan-review correction, which is a sheet drawn to the wrong edition. In practice, that means the structural engineer details framing and foundations to the 2021 IRC, the energy consultant runs insulation and duct numbers to the 2021 IECC, and the electrician wires to the 2020 NEC.

When you compare contractor bids, confirm each one is quoting current-code work. Fixing a wall or a panel after a failed inspection costs far more than building it right the first time. Jematell Homes builds in Scottsdale and designs every plan to the city's current adopted edition, so the codes are handled before a single footing is poured. For how these codes get checked at the counter, see Scottsdale Residential Building Permit Requirements, and for the whole project arc, see the steps to building a custom home in Arizona.

Where Jematell Homes comes in

Permitting and code compliance are part of our full-service project management. If you are planning a custom home in Scottsdale, Rio Verde, or the greater Phoenix metro, we are happy to walk through your project.

Sources

• City of Scottsdale Building Code Information
• ICC Code Adoptions for Arizona
• ICC: The International Codes (I-Codes), updated every three years