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Williamson County, Tennessee Building Codes

Updated : 04/22/2024

Overview

While no formal online code was located for Williamson County, TN, their website indicates they are currently under the 2015 International Codes including the 2015 IRC and IBC. Link to website. No online amendment code was located.

State regulations may not permit the adoption of a code less stringent than the codes adopted by the state. For the most accurate information please check with the local building department. See the Tennessee state overview. Link to Tennessee Building Codes.

Helpful resources for Williamson County, Tennessee include the following.

Residential Building Code

Tennessee adopted a statewide mandatory residential code that will control; however, local governments are free to make laws more strict (with some limitations).See PLRB, Tennessee Building Codes for more information on state level codes.

Williamson County adopted the 2015 IRC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the model code here.

You can find information about the adoption without amendment to the model code here.

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Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for Williamson County ? Yes
Comments:

While no formal online code was located regarding ice barriers, Mark McMillen, Building Official for Williamson County, TN confirmed they are required. (Per email dated 8/19/19.)

Government Officials
Last Name First Name Title E-mail Phone Note
McMillen Mark Building Official mark.mcmillanmark.mcmillan@williamsoncounty-tn.gov 615/790-5718

Comments

No online IRC amendment code was located.

Commercial Building Code

Williamson County adopted the 2015 IBC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the code here.You can find information about the adoption without amendment to the model code here.

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Comments

No online IBC amendment code was located.

Existing Buildings

Williamson County, TN did not adopt the IEBC, therefore Chapter 34 of the IBC would apply.

Other Building Codes

While no formal online code was located for Williamson County, TN, their website indicates they are currently under the following codes. Link to website.

2015 International Mechanical Code.

2015 International Plumbing Code.

2009 International Energy Conservation Code.