Utah Building Code: Which Editions Are Adopted

Direct answer

Utah State Construction Code on the 2024 IBC and 2024 IECC from 1 July 2026, with homes still on the 2021 IRC in Utah. Utah Code Title 15A adopts the 2024 IBC, IPC, IMC, IFGC, IECC and IEBC and the 2021 IRC by statute, with statewide Utah amendments; the 2024 IFC is adopted under the State Fire Code Act. H.B. 65 (2026), signed on 17 March 2026, moved the commercial codes from the 2021 to the 2024 editions on 1 July 2026 and replaced the energy chapter of the IRC with a shorter Utah-written envelope-only chapter. H.B. 45 (2026) moved the State Fire Code to the 2024 IFC on the same date. This was checked on 2026-10-01 against Utah Legislature (Utah Code Title 15A, State Construction and Fire Codes Act), which is the source that controls. The cross-state comparison further down this page comes from the ICC adoption chart dated January 2024, so where the two disagree the record above is the newer one.

Content and cited inputs reviewed by Harth team · Published 2026-09-07 · Updated 2026-10-01.

Which codes has Utah adopted now?

Utah State Construction Code on the 2024 IBC and 2024 IECC from 1 July 2026, with homes still on the 2021 IRC.

Utah Code Title 15A adopts the 2024 IBC, IPC, IMC, IFGC, IECC and IEBC and the 2021 IRC by statute, with statewide Utah amendments; the 2024 IFC is adopted under the State Fire Code Act.

Transition: H.B. 65 (2026), signed on 17 March 2026, moved the commercial codes from the 2021 to the 2024 editions on 1 July 2026 and replaced the energy chapter of the IRC with a shorter Utah-written envelope-only chapter. H.B. 45 (2026) moved the State Fire Code to the 2024 IFC on the same date.

Local adoption: The code editions and Utah amendments are set by the Legislature in statute and apply statewide.

Checked 2026-10-01 against Utah Legislature (Utah Code Title 15A, State Construction and Fire Codes Act). Confirm the edition and effective date for the specific permit jurisdiction before relying on it.

The cross-state record

For comparison across states, every I-Code the ICC Master I-Code Adoption Chart (January 2024) tracks, as it records Utah. Where this disagrees with the record above, the record above is newer:

Utah has a recorded edition year for 10 of the 17 codes: 2021 for the building, residential, fire, mechanical, plumbing, fuel gas, commercial energy, existing buildings and swimming pool and spa codes; 2015 for the residential energy code. The wildland-urban interface code appears as adopted by individual state or local agencies rather than as a statewide standard, so whether it applies depends on the permit jurisdiction for the project address. No adoption at all is recorded for the private sewage, green construction, property maintenance, performance, zoning and green building standard codes.

Source: ICC Master I-Code Adoption Chart (January 2024).

How Utah compares with its neighbours

Statewide editions in force, checked 2026-10-01; “Local” means no state adoption, “(limited)” a state adoption for some buildings only, and * a state-titled code built on that edition.

Idaho, Nevada, Colorado and Arizona differ from Utah on the building code alone. A practice working across that border is working to two editions, whatever the office standard says.

Where Utah sits in the national record

Of the 50 states and the District of Columbia, 10 enforce the 2024 IBC statewide, 0 a later edition, 24 an earlier one, and 17 have no statewide IBC edition in force. Utah is at or ahead of the national middle on the building code, so the risk runs the other way: work arriving from a slower-moving state may be drawn to an older edition.

Utah is one of 15 jurisdictions with no statewide residential energy code based on an IECC edition in force, so the energy question is answered by the state's own document or by the local jurisdiction.

Across all 17 codes the January 2024 ICC chart tracks, Utah has a recorded edition for 10, which ranked it 6th of 51. A low count is not a gap in regulation — it usually means the state legislates through its own documents, or leaves the discipline to local adoption.

What the chart does and does not tell you

The chart's own legend matters more than the numbers:

• An edition year means one or more state or local agencies adopted that edition. It does not mean every building in the state is designed to it.
• “Some jurisdictions only” is the chart's X: the code is in use somewhere in the state but is not the standard for all buildings.
• “Not adopted” is a blank cell — no state or local jurisdiction reported adopting that code.
• “State-written code” means the state publishes its own document in place of the model edition, so the model text is a reference, not the law.

ICC states plainly that not every jurisdiction notifies it of an adoption, and this chart is dated January 2024. Treat it as the starting point for a search, never as the answer.

How to confirm the edition that governs a Utah project

1. Open Utah Legislature (Utah Code Title 15A, State Construction and Fire Codes Act) and find the currently adopted code list with its effective date.
2. Check whether the permit authority for the project address is the state or a local programme with its own adoption.
3. Read the state amendments alongside the model edition — an amended table or definition changes the requirement even when the edition matches.
4. Record the permit application date. A code change usually applies from an effective date, and applications filed before it are normally reviewed under the previous edition.
5. Get the answer in writing from the authority having jurisdiction before it drives a design decision.

This site also hosts a transcription of the 2009 model code chapters as adopted in Utah at /building-codes/us-states/utah. That is a historical reference for the 2009 editions and is not Utah's current code basis.

Utah code-basis worksheet

Fill this in once per project and keep it with the drawing set. Every row is a question a plan reviewer can ask, and the answer changes with the address and the application date, not with the state.

This worksheet records a determination; it does not make one. The authority having jurisdiction decides which edition and which amendments apply.

Where can you explore related guidance?

• Explore all code adoption guidance
• Idaho Building Code: Which Editions Are Adopted
• Nevada Building Code: Which Editions Are Adopted
• Colorado Building Code: Which Editions Are Adopted
• Arizona Building Code: Which Editions Are Adopted

Sources and method

Adopted editions transcribed from the ICC Master I-Code Adoption Chart (January 2024), reproduced with the chart's own legend so an “X” is not mistaken for a statewide adoption. ICC notes that not all jurisdictions report their adoptions and publishes updates at iccsafe.org/adoptions. The current edition, its effective date and the state amendments are published by Utah Legislature (Utah Code Title 15A, State Construction and Fire Codes Act), which controls.

Source links

• iccsafe.org

• iccsafe.org

• le.utah.gov