Washington's State Building Code Council has set 05-03-2027 as the implementation date for the 2024 building and energy codes, after moving past an earlier target of 11-01-2026. For any project in design over the next six months, the code edition is now a scheduling decision.
Which code a project is reviewed under
Under RCW 19.27.095, a valid and fully complete building permit application is considered under the building permit ordinance in effect at the time of application, and the zoning and land use controls in effect on that date. In practice, a complete application filed before the new codes take effect is reviewed under the codes in place when it was filed.
The key word is complete. An application that a jurisdiction does not accept as complete has not vested, and if it is accepted after the switch, it is reviewed under the 2024 codes.
What to decide now
Target date. If the set can be complete and accepted well before 05-03-2027, design to the current codes and plan the submittal with margin for intake.
If the date is close, draw to 2024. A set that might miss the date is safer designed to the new edition than redrawn after a rejected intake.
Energy code compliance. The residential energy code drives envelope, mechanical and credit choices. Confirm which edition the energy forms follow before the set is detailed.
Phased projects. A building permit filed in one phase and a second permit filed later may sit under different editions.
Projects that already have permits
An issued permit is reviewed under the code it vested to. The risk is in expiration: a permit that lapses and is filed again is reviewed under the codes in effect at that point. Keeping inspections moving matters more in a code change year.
Where to watch
The Council publishes its adoption schedule, and cities post local adoption updates. Seattle adopts its own amendments to the state codes, so Seattle projects should also follow SDCI's code adoption page.
Frequently Asked Questions
When do Washington's 2024 codes take effect?
The State Building Code Council has set 05-03-2027 as the implementation date for the 2024 codes.
Will my project be reviewed under the old code?
If a valid and fully complete building permit application is filed before the new codes take effect, RCW 19.27.095 says it is considered under the ordinance in effect at the time of application.
What if my permit expires after the change?
A permit filed again after it expires is reviewed under the codes in effect when it is refiled.
Sources
Insights are general information researched from published sources on the date shown. Rules change, so confirm with the permitting authority before you act.
