Construction Code Interpretations

What Are They?

Our interpretations, policies, or code alternates were written to provide guidance for our review staff and to ensure consistency of our reviews. While they may be used as guidance for your design, they are subject to change without notice and their application to specific projects may vary.

For questions about how these code interpretations may apply to your project:

• Contact the building code plan reviewer assigned to your application, if you’ve submitted a permit application
• Visit the Applicant Services Center, if you haven’t yet started your project

To request an interpretation of the meaning, application, or intent of any development regulation in our Land Use Code or Environmentally Critical Area regulations during a land use project's comment period, see Comment on a Project.

2015 Seattle Building Code Interpretations

• 202 Boarding Characteristics
• 704.2 Column Protection
• 704.3 Protection of Primary Structural Frame Other Than Columns
• 705.2 Regulation of Covered Balconies
• 705.2 Aluminum Planks at Private Balconies
• 714.4 Membrane Penetrations of Horizontal Assemblies
• 1109.2 Toilet and Bathing Facilities
• 1208.1 and 1208.3 Habitable Room Size
• 1604.5 Risk Category Occupant Load Calculations
• 1604.5.1 Risk Category for Multiple Buildings on a Single Podium
• 1607.2 Clustered Conference Rooms-Live Load and Occupancy
• Director's Rule 9-2017 Small Efficiency Dwelling Units, SEDU Story Count for Natural Light
• Director's Rule 9-2017 Small Efficiency Dwelling Units, SEDU Closets and Storage
• Director's Rule 9-2017 Small Efficiency Dwelling Units, SEDU Minimum Yard and Court Dimensions for Natural Light

2015 Seattle Residential Code Interpretations

• 304.1 and 304.2 Habitable Room Size