Ohio · Building code

The building code in force in Ohio now.

2024 Ohio Building Code, OAC 4101:1 (2021 IBC with 2021 IEBC, IMC, IPC, IFGC, IECC/ASHRAE 90.1-2019, NFPA 70-2023), effective Mar 1, 2024. Enforced by Board of Building Standards-certified municipal, county and township building departments; Division of Industrial Compliance (Bureau of Building Code Compliance) where no certified local department exists (ORC 3781.03). Verified on the primary source, re-checked weekly.

Enter a Ohio ZIP code for the building view

Building code in Ohio

Verified on the source

In force

2024 Ohio Building Code, OAC 4101:1 (2021 IBC with 2021 IEBC, IMC, IPC, IFGC, IECC/ASHRAE 90.1-2019, NFPA 70-2023), effective Mar 1, 2024

Board of Building Standards adopted the 2021 I-codes by reference with Ohio amendments. Notable changes: mass-timber construction types, work-area method option for existing-building alterations, storm shelters for Group E schools.

Source: primary document

Who enforces it

Board of Building Standards-certified municipal, county and township building departments; Division of Industrial Compliance (Bureau of Building Code Compliance) where no certified local department exists (ORC 3781.03)

Statewide layer. County and city amendments sit on top; the building view resolves them from your ZIP.

What changes next

Comments due Sep 30, 2026

BBS five-year-review amendments to the 2024 OBC, Plumbing Code and Residential Code (not a new model edition) proposed; comments due Sep 30, 2026; hearing and effective date TBD

Dated items

Next 24 months

Sep 30, 2026

Written-comment deadline on Board of Building Standards five-year-review amendments to the 2024 Ohio Building Code, Ohio Plumbing Code and Residential Code of Ohio (2nd eNotification Sep 23, 2026; public hearing TBD)Ohio Board of Building Standards (Division of Industrial Compliance)

Dated

Questions about the building code in Ohio

Which building code applies in Ohio today?

2024 Ohio Building Code, OAC 4101:1 (2021 IBC with 2021 IEBC, IMC, IPC, IFGC, IECC/ASHRAE 90.1-2019, NFPA 70-2023), effective Mar 1, 2024. Board of Building Standards adopted the 2021 I-codes by reference with Ohio amendments. Notable changes: mass-timber construction types, work-area method option for existing-building alterations, storm shelters for Group E schools.

Who enforces the building code in Ohio?

Board of Building Standards-certified municipal, county and township building departments; Division of Industrial Compliance (Bureau of Building Code Compliance) where no certified local department exists (ORC 3781.03).

What changes next for the building code in Ohio?

Comments due Sep 30, 2026. BBS five-year-review amendments to the 2024 OBC, Plumbing Code and Residential Code (not a new model edition) proposed; comments due Sep 30, 2026; hearing and effective date TBD