Building Division Information

Effective March 15, 2024 the Building Codes for the State of Washington the City is required to comply with will change from the currently adopted 2018 version to the 2021 version. To be vested to the 2018 version of these codes, submitted permits must be complete, and include all required submittal documents prior to March 15, 2024.

The Building Division performs permit reviews, code interpretations, building inspections, and code enforcement.

What work does not require a building permit? Click here for a list

Apply for a building permit here

Contact a Permit Tech with any questions at permittech@mountvernonwa.gov or 360-336-6214. 


Currently Adopted Codes
Design Criteria
Ground Snow Load: 25
Wind Speed (mph): 85 cont. 110 gust
Seismic Design Category: D1
Subject to Damage From
-Weathering: MOD
-Frost Depth: 12
-Termite: STM
-Decay: TM
Winter Design Temp: 22
Flood Hazards: 1985
Ice Shield Under Req: No
Air Feezing Index: 129
Mean Annual Temp: 50.5
2021 ICC Code Update Information

The State Building Code Council voted on September 15, 2023, to delay the effective date of the 2021 Washington State codes. The new code effective date will be March 15, 2024. The previous effective date were October 29, 2023 and July 1, 2023 respectively. 

Here is a link to the new Wildland Urban Interface Code (WUI). This is a new code that will come into effect with the 2021 Updates. This may be a significant impact to projects in our area. 


  1. Development Services


    Physical Address
    910 Cleveland Avenue
    Mount Vernon, WA 98273



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