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Snohomish County, Washington Building Codes

Updated : 04/22/2024

Overview

Snohomish County, Washington, adopted the 2018 International Residential Code (IRC), including Appendices F, Q, and U, with amendments. Snohomish County, WA, Muni. Code § 30.52F.010 (adoption) and § 30.52F.300 (amendments). Snohomish County, Washington, adopted the 2018 International Building Code (IBC), including Appendix E and C, with amendments. Snohomish County, WA, Muni. Code § 30.52A.010 (adoption) and §§30.52A.020 – 30.52A.306 (amendments). Snohomish County, Washington, adopted the 2018 International Existing Building Code (IEBC). Snohomish County, WA, Muni. Code § 30.52A.010 (adoption) and §30.52A.300 (amendments). 

Note that the above codes are the current effective codes until March 15, 2024, when the 2021 edition will become effective. See PLRBWashington Building Codes

Helpful resources for Snohomish County, Washington include the following.

Residential Building Code

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

Snohomish County adopted the 2018 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 amendments to the model code here.

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2018 Washington State Residential Code (2018 IRC)(Snohomish County, WA Municipal Code)

...Adoption not found...

Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for Snohomish County ? No
Citation: Table R 301.2(1) - amended.
Municipal Code https://snohomish.county.codes/SCC/30.52F.300
Comments:

The amendment to Table R301.2(1) in the IRC indicates that ice barriers are not required.  Snohomish County, WA, Muni. Code § 30.52F.300 (amendments).

 

Comments

Snohomish County, Washington, adopted the 2018 International Residential Code (IRC), including Appendices F, Q, and U, with amendments. Snohomish County, WA, Muni. Code § 30.52F.010 (adoption) and § 30.52F.300 (amendments).

Existing Buildings

Existing buildings, meaning buildings that were built in accordance to code at the time of construction, typically merit extra consideration in a current updated code.

No adoption of Appendix J was found in the municipal code.

Snohomish County, Washington, adopted the 2018 International Existing Building Code (IEBC). Snohomish County, WA, Muni. Code § 30.52A.010 (adoption) and §30.52A.300 (amendments). 

Commercial Building Code

Snohomish County adopted the 2018 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 amendments to the model code here.

Auto Search - beta:

2018 Washington State Building Code (2018 IBC)(Snohomish County, WA Municipal Code)

...Adoption not found...

Comments

Snohomish County, Washington, adopted the 2018 International Building Code (IBC), including Appendix E and C, with amendments. Snohomish County, WA, Muni. Code § 30.52A.010 (adoption) and §§30.52A.020 – 30.52A.306 (amendments). 

Existing Buildings

Snohomish County, Washington, adopted the 2018 International Existing Building Code (IEBC). Snohomish County, WA, Muni. Code § 30.52A.010 (adoption) and §30.52A.300 (amendments). 

 

Other Building Codes

Snohomish County, Washington, adopted the 2009 ICC/ANSI A117.1 Accessible and Usable Buildings, and Facilities. Snohomish County, WA, Muni. Code § 30.52A.010 (adoption).

Snohomish County, Washington, adopted the 2018 International Swimming Pool and Spa Code (ISPSC). Snohomish County, WA, Muni. Code § 30.52A.010 (adoption).

Snohomish County, Washington, adopted the 2018 International Mechanical Code (IMC). Snohomish County, WA, Muni. Code § 30.52B.010 (adoption).

Snohomish County, Washington, adopted the 2018 Washington State Energy Code. Snohomish County, WA, Muni. Code § 30.52D.010 (adoption). 

Snohomish County, Washington, adopted the 2018 Uniform Plumbing Code, including Appendices A, B, and I. Snohomish County, WA, Muni. Code § 30.52E.010 (adoption).

Snohomish County, Washington, adopted the 2018 International Fire Code. Snohomish County, WA, Muni. Code § 30.53A.010 (adoption) and § 30.53A.100- 30.53A.538 (amendments).

Snohomish County, Washington, adopted the 1997 Uniform Code for the Abatement of Dangerous Buildings. Snohomish County, WA, Muni. Code § 30.53B.010 (adoption) and § 30.53B.020-30.53B.060 (amendments).

Note that the above codes are the current effective codes until March 15, 2024, when the 2021 edition will become effective. See PLRBWashington Building Codes