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Building Code Information
Updates and Provision
Effective November 26, 2021, the 2021 International Codes for Building, Residential, and Swimming Pool and Spa, State of Iowa Electrical, Plumbing, Mechanical and Fuel Gas code, all with local amendments are adopted and will be enforced on all construction permits submitted and constructed thereafter in the City of Johnston. Generally, city staff made very few changes from previous code amendments and requirements; however, a published change in the shear wall bracing provisions of chapter 602.10 of the International Residential Code has been changed and will require your design attention. Additionally, please refer to the State of Iowa Energy Code for changes to return air ducting provisions and system sizing.
Current Rules
- International building and residential codes (IBC) 2021 edition website
- View Chapter 155 of the Johnston Building Code
- View the State of Iowa Plumbing Code with local amendments in chapter 156 of the Johnston Code of Ordinances as adopted by Ordinance#1069
- State of Iowa Electrical Code with local amendments in Chapter 157 of the Johnston Code of Ordinances as adopted by Ordinance#1067
- State of Iowa mechanical code with local amendments in Chapter 158 of the Johnston Code of Ordinances as adopted by Ordinance#1070
- State of Iowa Fuel Gas Code with local amendments in chapter 154 of the Johnston Code of Ordinances as adopted by Ordinance #1068
- International Swimming Pool and Spa Code (ISPSC) 2015 Edition
- International Property Maintenance Code (IPMC) 2015 Edition
These codes and special provisions can be updated periodically by amendments passed by the Johnston City Council.
The following codes are the adopted model codes that form the basis for the City of Johnston codes.
- International Building Code (IBC) 2021 Edition
- International Residential Code (IRC) 2021 Edition
- International Existing Building Code (IEBC) 2021 Edition
- Uniform Plumbing Code (UPC) 2021 Edition
- National Electrical Code (NEC) 2020 Edition
- International Mechanical Code (IMC) 2021 Edition
- International Swimming Pool and Spa Code (ISPSC) 2015 Edition
- International Property Maintenance Code (IPMC) 2015 Edition