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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 2015 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


2015 Seattle Mechanical Code

2012 Seattle Mechanical Code

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

Previous Versions

Purchase Codes

Recent Changes

As of January 1, 2017, you must design your Seattle projects using the 2015 Seattle Mechanical Code. We will have electronic and print copies of the 2015 code available soon. We will post the electronic version on this website as soon as it's available. Print versions will be available through our Public Resource Center.

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