Building Alteration

This application is for any building alteration to a residential or commercial property. The proposed project should not add square footage (new structure area). Typical examples include but are not limited to changes to the building floor plan including the removal of non-bearing walls; bathroom, kitchen or basement remodels; reframed roofs and façade changes; garage or carport conversions; roofs over previously uncovered deck or patio spaces; fire damage repairs, etc.

The following documentation must be submitted when applying for a building alteration permit:

If on a septic system, provide approval from King County Health Department for septic design

ADU registration form, if applicable

Site Plan, include

• All property lines and buildings

Architectural Plans, include:

• Floor plans with door and windo locations
• Building elevations, stair details, and typical wall, ceiling, and floor sections
• Show compliance with the Sound Transmission Code, if applicable
• Show compliance with the Washington State Energy Code requirements
• Show all mechanical appliance and plumbing fixture layout on the floor plans

Structural Plans, include:

• Foundation plans
• Complete framing plans, to include roof and floor framing plans
• Lumber dimensions, species, grade, spans and spacing, as needed
• Wall, ceiling, and floor sections or provide a building cross section