Planning & Development



Effective December 14, 2010, the City of Clayton has adopted the following codes:

  • Part I, the 2009 International Building Code
  • Part II, the 2009 International Mechanical Code
  • Part III, the 2009 International Plumbing Code
  • Part IV, the 2009 International Residential Code
  • Part V, the 2009 International Fuel Gas Code
  • Part VI, the 2009 International Energy Conservation Code 

Included are all appendices to each code.

The 2008 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.

Click here to view the adopting ordinance and local amendments.

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

Carbon Monoxide Alarm Requirement
The 2009 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. Alarms may be hardwired, battery operated or plug-ins. 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.