Building Division

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Code Questions/Clarifications – For general building, plumbing and mechanical code questions, please submit your question to

Effective January 1, 2016, the City of Clayton has adopted the following codes:

  • Part I, the 2015 International Building Code
  • Part II, the 2015 International Mechanical Code
  • Part III, the 2015 International Plumbing Code
  • Part IV, the 2015 International Residential Code
  • Part V, the 2015 International Fuel Gas Code
  • Part VI, the 2015 International Energy Conservation Code
  • Part VII, the 2015 International Existing Building Code

Included are all appendices to each code.

The 2014 National Electric Code has also been adopted as part of the St. Louis County amendments.

In addition to the actual Code, amendments are contained in the Ordinance that are designed to take into consideration circumstances and standards which are specific to Clayton.

To purchase the code (without local amendments), please visit the International Code Council's web site,

ICC also makes model I-Codes and standards available free online as a service to the public[]=2015&page=1

Carbon Monoxide Alarm Requirement

The 2015 International Residential Code requires carbon monoxide alarms in new one and two family dwellings and in existing one and two family dwellings when work requiring a permit takes place. The carbon monoxide alarms must be installed in the immediate vicinity of all sleeping areas. Hardwired, battery operated or plug-in alarms may be used. Unlike the smoke alarm requirements, there is no exception for exterior work or the addition of decks or porches. Roofing, siding, window replacement and other exterior work requiring a permit will require the installation of carbon monoxide alarms. Click here to view a summary of the requirements

Inspection Scheduling

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