Updated : 07/22/2024

Overview

O’Fallon, Illinois, adopted the 2018 International Residential Code (IRC), including appendix H, with amendments. O’Fallon, IL, Muni. Code § 150.01 (adoption) and § 150.06 (amendments). O’Fallon, Illinois, adopted the 2018 International Building Code (IBC), including appendices G, H, J, with amendments. O’Fallon, IL, Muni. Code § 150.01 (adoption) and § 150.02 (amendments). O’Fallon, Illinois, adopted the 2018 International Existing Building Code (IEBC), with amendments. O’Fallon, IL, Muni. Code § 150.01 (adoption) and § 150.07 (amendments).

Helpful resources for O’Fallon, Illinois include the following.

• Jurisdiction's Information Page(s):
  • O'Fallon, IL Website
  • O'Fallon, IL Code of Ordinances
  • O'Fallon, IL Building Regulations
• PLRB, Ordinance and Law Coverage Discussion for Illinois

Residential Building Code

Illinois has yet to adopt a statewide residential code. Local laws will control.See PLRB, Illinois Building Codes for more information on state level codes.

O’Fallon adopted the 2018 IRC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the model code here.

You can find information about amendments to the model code here.

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Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for O’Fallon ? Undetermined
Comments:

No amendments to Table R301.2(1) were found in the municipal code or city website; Therefore, it is unclear if ice barrier underlayment is required.

Government Officials

Comments

O’Fallon, Illinois, adopted the 2018 International Residential Code (IRC), including appendix H, with amendments. O’Fallon, IL, Muni. Code § 150.01 (adoption) and § 150.06 (amendments).

Existing Buildings

Existing buildings, meaning buildings that were built in accordance to code at the time of construction, typically merit extra consideration in a current updated code.

Please refer to appendix J of the adopted IRC.

O’Fallon, Illinois, adopted the 2018 International Existing Building Code (IEBC), with amendments. O’Fallon, IL, Muni. Code § 150.01 (adoption) and § 150.07 (amendments).

Commercial Building Code

O’Fallon adopted the 2018 IBC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the code here.You can find information about amendments to the model code here.

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Comments

O’Fallon, Illinois, adopted the 2018 International Building Code (IBC), including appendices G, H, J, with amendments. O’Fallon, IL, Muni. Code § 150.01 (adoption) and § 150.02 (amendments).

Existing Buildings

O’Fallon, Illinois, adopted the 2018 International Existing Building Code (IEBC), with amendments. O’Fallon, IL, Muni. Code § 150.01 (adoption) and § 150.07 (amendments).

Other Building Codes