Residential New Single Family, Duplex or ADU Checklist

Plans

Site Plan
- What to include on a residential site plan
Proposed Floor Plan
- Show all dimensions, room identification, window size and type, decks, and balconies
- Include ventilation per M1507, smoke detectors, plumbing fixtures, water heater, and furnace
Foundation Plan and Details
- Show all dimensions, placement of rebar, footing sizes, anchor bolt sizes and spacing, hold downs, connections, vent size and locations, and crawl space access location
- If over 200 square feet, provide location and details for radon mitigation
Floor and Roof Framing Plans
- Size, spacing and bearing locations for all framing members including stairs and attic ventilation
Wall and Bracing Sections and Details
- Indicated proposed minimum insulation and Max U values for each exterior element. (Roof, above and below grade walls, floor, doors and windows)
Exterior Elevations
- All sides; show actual grade

Signed and Dated New Single Family, Duplex, Modular or Mobile Homes Application Form
Completed Stormwater Applicability Form
Energy Code Forms: WSU Energy Program
- OPTION A
  - Single Family Prescriptive Form
  - Glazing Schedule
  - Mechanical Sizing Calculation
    - Heating Only – Simple Heating System Sizing Calculator or
    - Heating and Cooling – Manual “J” from an HVAC Company
- OPTION B
  - Code Compliance Calculator (C3)
Structural Calculations
- Engineered Lateral Analysis: engineering for wind and seismic loads or prescriptive path
- Beam Calculations for all beams spanning 10 feet or more, plus beams supporting or creating point load
- Engineered Floor or Roof Systems require manufacturers’ layout, labeled i-joist or truss details and installation guides