2021 Seattle Code Adoption - What & Why
The 2021 Washington state codes will be mandatory on March 15, 2024. The effective date for the 2021 Seattle codes is no sooner than July 1, 2024. Applicants may use the 2021 Washington codes with the draft Seattle amendments before March 15, 2024, when accompanied by a code modification request. Between March 15, 2024, and the Seattle code effective date, applicants may use either the 2018 or 2021 Seattle codes without a code modification request. To sign up for updates, click the Subscribe Now button.
What’s Happening Now?
SDCI has released the following draft proposed changes to the 2021 Seattle codes:
- 2021 Draft Seattle Building Code
- 2021 Draft Elevator Code
- 2021 Draft Seattle Energy Code
- 2021 Seattle Energy Code Fossil Fuel Compliance Path Presentation
- 2021 Draft Seattle Existing Building Code
- 2021 Draft Seattle Fire Code
- 2021 Draft Seattle Fuel Gas Code
- 2021 Draft Seattle Mechanical Code
- 2021 Draft Seattle Plumbing Code
- 2021 Draft Seattle Residential Code
- 2021 Draft Seattle Wildland-Urban Interface Code
- 2024 Draft Seattle Boiler and Pressure Vessel Code
We also have a brief guide to understanding the markings in the draft code change documents to help you understand the proposed changes.
The Seattle construction codes are being updated to the 2021 code editions and include the building, residential, existing building, energy, mechanical, plumbing, fuel gas, wildland urban interface, and fire codes. The Boiler and Pressure Vessel Code is also being updated to the 2023 edition. The target effective date for these new codes is no sooner than July 1 2024. There is no planned grace period beyond the adoption date.
As part of this process, SDCI is preparing the 2021 Seattle Construction Codes for adoption by the Seattle City Council. SDCI is incorporating changes made by the State of Washington in its adoption of the 2021 national model codes (I-codes) and changes in the 2021 editions of the I-codes made by the International Code Council as recommended by the Seattle Construction Codes Advisory Board.
The State of Washington Building Code Council has posted the changes for the 2021 codes at the following links:
- Washington State Building and Existing Building Codes, Chapter 51-50 WAC
- Washington State Residential Code, Chapter 51-51 WAC
- Washington State Mechanical and Fuel Gas Codes, Chapter 51-52 WAC
- Washington State Fire Code, Chapter 51-54A WAC
- Washington State Energy Code, Energy Code SBCC
- Washington State Wildland Urban Interface Code, Chapter 51-55 WAC
- Washington State Plumbing Code, Chapter 51-56 WAC
The City of Seattle adopts most of these changes. SDCI will post the proposed 2021 Seattle code changes once they are available.
Current Seattle Codes Are Available
The 2018 Seattle construction codes are available for purchase through the International Code Council as a bookmarked pdf copy that you can download.
You can order printed copies of the Seattle construction codes and errata through SDCI. View our publication list for prices. To order, please submit a request through the Seattle Services Portal using the Permits - Trade, Construction and Land Use option. See How to Purchase Seattle Code Books From SDCI for instructions on how to submit your request.
Read only versions of the Seattle construction codes and errata are available on the code webpages.
Project Benefits
Regular updates to Seattle's construction codes make it easier to:
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Incorporate emerging technology and materials into construction to increase a building's safety, usability, and lifespan
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Keep Seattle competitive and innovative with early adoption of national code changes
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Adopt requirements that ensure Seattle's leading-edge energy and carbon reduction goals are met
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Decrease differences in construction code adoption and enforcement with neighboring communities
The End Result
SDCI is preparing for the adoption of the 2021 editions of the national model codes published with State of Washington and local Seattle amendments.