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Mechanical Code

What Is It?

The Seattle Mechanical Code regulates design and installation of mechanical systems, appliances, appliance venting, duct and ventilation systems, combustion air provisions, hydronic systems, and solar systems. Seattle has adopted the 2012 International Mechanical Code, with amendments specific to our jurisdiction.

What It Isn't

This code does not cover regulations for fuel gas appliances and systems. Fuel gas includes natural, liquid petroleum, and manufactured gases. Those appliances and systems are regulated by the Seattle Fuel Gas Code.

Read the Code


2012 Seattle Mechanical Code

This is a read-only version of the 2012 Seattle Mechanical Code. You can buy a full version from

Previous Versions

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Recent Changes

Our 2014 changes to the 2012 Seattle Mechanical Code took effect on November 23.

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