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  1. Why it matters
  2. How it works
  3. The paths
  4. What people mix up
  5. How to check
  6. Limits
  7. Related records

Home / Guides / How the documents differ / Arizona WUI code status

Arizona WUI code status

Last verified 2026-08-26.

This page is Arizona law.

Arizona does not have a statewide IWUIC construction book. A.R.S. 11-861 lets a county board of supervisors adopt building codes by reference for zoned unincorporated areas. Subsection D separately lets that board adopt a current wildland-urban interface code, adapted from a national or international model, after a public process. A.R.S. 9-806(A) is the parallel option for a city or town. “May adopt” is not a mandate.

You are looking at a lot in Arizona and asking which book binds a new roof. The answer is the city or county ordinance. Phoenix, Tucson, and Flagstaff are not the same book. This site does not mint a city doorway page.

Why it matters

Embers still reach a Flagstaff eave. A missing statewide WUI book means you cannot spec “Arizona IWUIC Class A” as a state minimum. You can spec the local ordinance if one exists, or an insurer checklist such as IBHS Wildfire Prepared. See the hardening ladder.

How it works

A.R.S. 11-861(A) is optional county building-code adoption. Rural or unclassified zoning may be exempted. A.R.S. 11-861(D) is the county WUI hook. A.R.S. 9-806(A) is the city-or-town hook. Both require written public procedures, a chance to comment, and consultation with federal, state, and local officials. Neither names an edition.

Opened local examples include Flagstaff and Prescott. Flagstaff City Code 5-02-001 includes IWUIC amendments, and Flagstaff’s WUI requirements handout still names the 2006 edition. Prescott City Code 6-2 now adopts the 2024 IWUIC and declares the entire city a WUI; City GIS and predictive modeling still decide the risk class. Do not treat either city as Arizona’s book or a ZIP as a parcel result.

The paths

  1. Local WUI code. Spec the ordinance the building official names.
  2. Ordinary IBC or IRC. Where no WUI overlay exists.
  3. Harden anyway. IBHS is a designation, not adopted code.

What people mix up

  • Treating Flagstaff’s 2006 IWUIC or Prescott’s 2024 IWUIC as a statewide mandate.
  • Assuming Prescott’s citywide WUI declaration also answers the parcel’s IR1, IR2, or IR3 risk class.
  • Importing Oregon R327 or California CWUIC onto an Arizona drawing.
  • Treating this page as a parcel map.

How to check

  1. Ask the building official which construction book is adopted, and whether a WUI overlay applies to the lot.
  2. Read A.R.S. 11-861 and A.R.S. 9-806.
  3. This site does not read your parcel.

Limits

This page does not decide a permit. It does not quote a local ordinance other than the Flagstaff, Sedona, and Prescott examples we opened.

Questions

Does Arizona require IWUIC construction on my lot today?

Not as a statewide book. A.R.S. 11-861(D) lets a county board adopt a current wildland-urban interface code. A.R.S. 9-806(A) lets a city or town do the same.

Can my city adopt IWUIC even if the county has not?

Yes. A.R.S. 9-806(A) says a city or town may adopt a current wildland-urban interface code adapted from a national or international model. 9-806(B) requires written public procedures. That is optional, not a statewide mandate.

What did Flagstaff adopt?

Flagstaff City Code 5-02-001 includes IWUIC amendments. City materials still name the 2006 IWUIC as the opened edition, with local amendments. That is Flagstaff’s book, not Arizona’s. This site does not mint a city doorway page for it.

What did Prescott adopt?

Prescott City Code 6-2-1 now adopts the 2024 IWUIC by reference through Resolution 2026-1983, with Ordinance 2026-1943 recorded on May 12, 2026. Section 302 declares the entire city WUI, while City GIS and predictive modeling assign the risk class. That is Prescott's book, not Arizona's.

Does this site read my parcel?

No. There is no statewide WUI construction map to link. Ask the building official whether a local overlay exists.

Sources