2021 International Code Council Plumbing, Mechanical Codes Available

The International Code Council recently released its 2021 International Plumbing Code and International Mechanical Code. Building codes play a significant role in maintaining safe and healthy communities – permitting more resilient, sustainable and livable structures for generations to come.

The IPC and IMC are revised on a three-year cycle through the Code Council’s respected consensus code development process that draws upon the expertise of hundreds of plumbing, mechanical, building and safety experts from across North America. With updates every three years, building codes allow for ongoing consideration of new technologies and scientific understandings.

International Plumbing Code

The IPC establishes safety standards for health, safety, property protection and public welfare by prescriptive and performance provisions for the design, construction, installation, quality of materials, location, operation and maintenance or use of plumbing equipment and systems. 2021 additions/updates include:

  • Multiple-user toilet facilities to serve all genders are now permitted
  • Two new methods for relining/rehabilitation of existing sewers have been added
  • Accommodations for mounted rooftop solar panels over vent terminals have been added
  • CSA B805/ICC 805 Rainwater Harvesting Systems is now allowed as an alternative design method

In 2019, the Code Council commissioned a comprehensive independent analysis of the costs and savings associated with building under the IPC. The study found that over a 12-year period, counties that used the IPC saved $38 billion in construction costs and emitted one million fewer tons of carbon dioxide. The savings that resulted from use of the IPC contributed to national efforts to improve housing affordability.

International Mechanical Code

The IMC establishes minimum requirements for mechanical systems using prescriptive and performance-related provisions. It is founded on broad-based principles that make possible the use of new materials and new mechanical designs. 2021 additions/updates include:

  • Clothes dryer exhaust terminals are now required to be at least three feet from any opening into a building
  • Polyurethane spray-applied foam on the exterior of ducts in attics and crawl spaces is now required to meet specific smoke and flame index limits
  • Fire and smoke dampers must now be provided with approved access for inspection and maintenance
  • Refrigerant tables now include new refrigerants

The 2021 IPC and IMC are available for pre-order and will be available in print and digitally in March. Related provisions of the ICC A117.1-2017 Standard for Accessible and Usable Buildings and Facilities will be included as a resource in the 2021 IPC. To pre-order the 2021 IPC and IMC, visit: