Residential Addition Checklist
Plans
- 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 addition is 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
Documents
- Signed and Dated Residential Additions, Remodels, Accessory Structures Application Form (PDF)
- Completed Stormwater Applicability Form (PDF)
- Energy Code Forms: WSU Energy Program
- OPTION A
- Single Family Prescriptive Form
- Glazing Schedule
- Mechanical Sizing Calculation
- Heating only – Simple Heating System Sizing Calculator
- 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
Resources
