Seattle Building Code 2025

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The document provides guidance on the Seattle Building Code requirements for existing buildings undergoing substantial alterations. It defines 'substantial alteration' and outlines the specific conditions under which these requirements apply, including criteria related to repairs, remodeling, occupancy changes, and increases in occupant load. The document emphasizes the importance of evaluating structural and life safety systems during such projects and details compliance paths with energy efficiency standards. It also encourages pre-submittal meetings with Seattle DCI for clarification on code issues.

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Got questions?

We have answers to the most popular questions from our customers. If you can't find an answer to your question, please contact us.

What are the building setbacks for the city of Seattle?

Required Front Yard: 20 feet or the average of the front yards of the single family residence on either side of your lot, whichever is less. Required Rear Yard: 25 feet, or 20 percent of lot depth (minimum of 10 feet) whichever is less. Required Side Yard: 5 feet.

Which state has the strictest building code?

In the recently released 2021 edition of Rating the States, Florida has again taken the top spot for strongest building code with Virginia right behind in second place and South Carolina coming in third.

How do I report a building code violation in Seattle?

You can file a complaint in one of 3 ways: Call our Violation Complaint Line at (206) 615-0808: For time-sensitive complaints. If you dont have a valid email address. Visit our Seattle Services Portal for complaints that are not time-sensitive. Send a letter to: Seattle Department of Construction and Inspections.

What is the code for Seattle?

Area code 206 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Washington. The numbering plan area (NPA) includes Seattle and most of its innermost suburbs.