2021 Seattle Construction Code Update
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 City of Seattle adopts the Seattle construction codes after Washington state adopts the state construction codes. The Washington state 2021 Construction Codes effective date is currently March 15, 2024. The target implementation date for the 2021 Seattle Construction Codes is delayed to no sooner than July 1, 2024, as we continue our City ordinance process.