Residential New Single Family, Duplex or ADU Checklist
Plans
1. Site Plan
2. Proposed Floor Plan
- Include Room identification
- Dimension all windows and doors
- Include door swings and operation of each window
- Label all tempered and egress windows
- Locate all decks, balconies, porches, patios, stairs, steps, and ramps
- Locate all plumbing fixtures and exhaust fans
- Locate all smoke detectors and carbon alarms
- Locate radon vent in a warm interior wall
- Locate and identify all appliances
- Locate and identify all mechanical equipment
- Locate and identify all HVAC equipment
- Locate electrical panel
- Locate all fire-resistance rated wall assemblies if utilized
- Locate a heat detector (HD) in the center of all attached garages
- Locate junction box, receptacle outlet, or electrical vehicle charging equipment connected to a 40-ampre dedicated 208/240-volt branch circuit in all attached garages and/or carports
Specific to ADU:
- Locate separate Water Heater and HVAC equipment in the Accessory Dwelling Unit or in common areas accessible to all residents
- Locate water and gas line shut off
- Locate electrical panel and label it as new service or subpanel. If utilizing a subpanel, upload a load calculation from an electrician to the documents folder in ePlans
Floor plan details to include based on design:
- Water heater anchoring
- Stair and handrail
- Guard rail and post attachment
- Window wells
- Egress windows
- Insulated headers
- Deck details
- Ramps
- Tested assembly detail when fire and/or sound rating is required.
3. Proposed Foundation Plan
- Locate all continuous footings, spread footings, basement retaining walls, and pony walls
- Indicate footing sizes, anchor bolt size and spacing
- Locate and identify all hold downs and their capacities
- Locate all crawl space vents and include their size
- If crawl space vents cannot be spaced evenly on a minimum of three sides of the crawl space, or do not provide enough ventilation per code, locate a continuously operated mechanical exhaust fan with a minimum of 1 CFM for every 50 square feet of crawl space
- Provide radon mitigation layout
- Locate and dimension crawl space access and access through pony walls
Foundation details to include based on design:
- Typical foundation wall
- Typical slab foundations
- Stepped footing
- Post and beam
- Radon mitigation details
- Basement retaining wall (engineering required, obtain detail from Engineer of Record)
- Prescriptive patio cover footing (one of two options must be used unless designed by an Engineer)
- Protection Against Decay
4. Proposed Floor Framing Plan
- Include size, spacing, and span for all framing members
- For wood framing, include the species and grade of framing members
- Include bearing locations for all framing members including stairs
- For engineered framing products such as I-joists, include calculations and a layout diagram from the manufacturer
- Include location and framing for crawl space access
5. Proposed Roof Framing Plan
- Include size, spacing, and span for all framing members
- For wood framing, include the species and grade of framing members
- Include bearing locations for all framing members
- For manufactured trusses, include calculations prepared by a licensed Washington State Engineer and a layout diagram from the manufacturer
6. Proposed Roof Plan
- Include all ridge lines and valleys
- Include location of all attic vents
- Include all roof overhangs with their dimensions
- Include the slope of the roof, sheathing type and thickness, and roof covering material
Roof details to include based on design:
- Gable end bracing for trusses and truss or rafter uplift connection
7. Proposed Section Plan
- Dimension story height, ceiling height, and total height of the structure
- Include Room identification
- Include all interior walls
- Locate fire-resistance rated wall and floor/ceiling assemblies if utilized
- Indicate the size and spacing of structural members such as beams, joists, studs, and rafters along with their spacing
- Indicate the connection of floor joists to the wall framing at upper levels and the connection of roof rafters to double top plates
- Indicate proposed minimum insulation R-values and maximum U-factors for each exterior element. (Roof, above and below grade walls, floor, doors, and windows)
Wall section details to include for fire-resistance rated assembly:
8. Proposed Lateral Bracing Plan (only required for Prescriptive Path)
- Indicate all braced wall lines
- Locate and dimension all wood structural panels, Alternate braced wall panels, portal frames etc.
- Locate all windows and doors
- Upload the APA Wall Bracing Calculator to the documents folder in ePlans (See resources for a link to the APA Wall Bracing Calculator)
Bracing details to include based on design:
- Braced wall panel methods
- Exterior brace wall lines at corners
- Braced wall panel method 1&2
- Portal frame
- Continuous sheathing portal frame
- Alternate braced wall panel with hold downs
- Cantilever brace wall connection
9. Exterior Elevations
- Provide elevation drawings for all four sides of the home
- Include accurate grade lines
- Include lines representing finished floor levels
- Dimension wall height for each story
- Dimension building height, measured from average grade to average roof peak
General
- All plans must include accurate scale and dimensions
- The minimum sheet size for drafted plans is 17×11 inches, but 24×18 inches or 36×24 inches are preferred.
- All plan pages uploaded for review must be the same size
- DO NOT resize plans as the scale provided will not be accurate
Documents
- Signed and Dated New Single Family, Duplex, Modular or Mobile Homes 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 or
- Heating and Cooling – Manual “J” from an HVAC Company
- OPTION B
- Code Compliance Calculator (C3)
- OPTION A
- 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