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Innovative - Responsive - Professional
Plumbing Permit
Building Services
Complete this form to submit at City Hall. Or, use to submit your application 100% online.
Use this checklist to help gather all the required information and documents in order to submit a complete Plumbing
Permit Application.
Plumbing Permit Application (completely filled out)
Supplemental Plumbing Information sheet indicating fixtures to be relocated, replaced, installed or removed
Plumbing plans shall show the following, as applicable. (Plans not required for 1 and 2 unit residential buildings.)
Pipe size and fixture units for sanitary and potable water systems
Calculations for water meter sizing and DWV fixture units for building drain
Location and type of proposed fixtures
Riser diagram with waste, vent and potable water piping locations and sizes. (Isometric drawings are required
for projects that include a commercial kitchen, a grocery store, or more than 3 stories.)
Finished floor and sanitary sewer elevations (required for sumps)
Detail of drains/cleanouts (required for underslab footing drains or where recommended by geotechnical
Pipe size, details and square footage of roof area (required for roof drains/overflow)
If an engineered method is used instead of following prescriptive requirements, note that on the plans
Other pertinent details showing construction of interceptors, piping support, firestop penetration systems, etc.
Structural plans shall show the following, as applicable. (Plans not required for 1 and 2 unit residential buildings.)
Framing plans and calculations for vertical and lateral loads, stamped by a Washington State registered
professional engineer (required for units weighing more than 400 pounds)
Anchorage details for floor supported plumbing equipment. Details shall show how plumbing fixtures are
anchored to the structure in order to resist displacement vertically and on both horizontal axes due to seismic
Anchorage details for suspended plumbing equipment. Details shall show rigid vertical hangers braced in both
horizontal directions. Connections by pipes or ducts that are, or contain, non-rigid elements that are not of
inherent sufficient strength or which are not adequately anchored, will not be acceptable as equipment or
appliance anchors.
Also, for medical gas piping:
Site plan indicating the location of existing or new cylinder storage areas, property lines, driveways, and existing or
proposed new buildings
Piping layout showing the proposed piping system or alteration, including locations of alarms, valves, origin of
gases, and user inlets/outlets
Calculated demand and loading of any piping, existing, proposed or future, shall also be indicated
Indicate all alarms and backup power supply for the alarms
Materials specifications