Ohio Building Code: Which Editions Are Adopted

Direct answer

2024 Ohio Building Code, effective 1 March 2024; homes follow the 2019 Residential Code of Ohio in Ohio. The Ohio Building Code is built on the 2021 IBC (with the 2021 IECC or ASHRAE 90.1-2019 for energy), and the Residential Code of Ohio on the 2018 IRC, both adopted as Ohio Administrative Code rules by the Board of Building Standards. Building designs first submitted for plan review before 1 March 2024 stay under the code in force at that time. The Ohio Fire Code rules were rewritten with an effective date of 20 November 2025. In July 2026 the Board gave notice of five-year-review amendments to the 2024 Ohio Building Code and the 2019 Residential Code of Ohio; these do not change the model-code editions. This was checked on 2026-10-01 against Ohio Board of Building Standards, Ohio Department of Commerce, 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 Ohio adopted now?

2024 Ohio Building Code, effective 1 March 2024; homes follow the 2019 Residential Code of Ohio.

The Ohio Building Code is built on the 2021 IBC (with the 2021 IECC or ASHRAE 90.1-2019 for energy), and the Residential Code of Ohio on the 2018 IRC, both adopted as Ohio Administrative Code rules by the Board of Building Standards.

Transition: Building designs first submitted for plan review before 1 March 2024 stay under the code in force at that time. The Ohio Fire Code rules were rewritten with an effective date of 20 November 2025. In July 2026 the Board gave notice of five-year-review amendments to the 2024 Ohio Building Code and the 2019 Residential Code of Ohio; these do not change the model-code editions.

Local adoption: The Ohio Building Code and Residential Code of Ohio apply statewide and cannot be replaced locally. They are enforced by building departments certified by the Board of Building Standards; commercial work outside a certified local department is reviewed by the state, while one-, two- and three-family dwellings are inspected only where a certified residential department exists.

Checked 2026-10-01 against Ohio Board of Building Standards, Ohio Department of Commerce. 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 Ohio. Where this disagrees with the record above, the record above is newer:

Ohio has a recorded edition year for 8 of the 17 codes: 2018 for the residential and residential energy codes; 2015 for the building, fire, mechanical, plumbing and fuel gas codes; 2012 for the commercial energy code. The property maintenance, swimming pool and spa and zoning codes appear as adopted by individual state or local agencies rather than as a statewide standard, so whether they apply depends on the permit jurisdiction for the project address. No adoption at all is recorded for the private sewage, green construction, existing buildings, performance, wildland-urban interface and green building standard codes.

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

How Ohio 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.

Indiana, Pennsylvania and Kentucky differ from Ohio on the building code alone. A practice working across that border is working to two editions, whatever the office standard says.

Where Ohio sits in the national record

Of the 50 states and the District of Columbia, 17 enforce the 2021 IBC statewide, 10 a later edition, 7 an earlier one, and 17 have no statewide IBC edition in force. Ohio 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.

Across all 17 codes the January 2024 ICC chart tracks, Ohio has a recorded edition for 8, which ranked it 20th 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 Ohio project

1. Open Ohio Board of Building Standards, Ohio Department of Commerce 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.

Ohio 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
• Michigan Building Code: Which Editions Are Adopted
• Indiana Building Code: Which Editions Are Adopted
• Pennsylvania Building Code: Which Editions Are Adopted
• Kentucky 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 Ohio Board of Building Standards, Ohio Department of Commerce, which controls.

Source links

• iccsafe.org

• iccsafe.org

• dam.assets.ohio.gov