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County of Mason (WA)

Washington Authority Having Jurisdiction Solar permitting requirements
NEC Code Version2023
Fire Code Version2018 Building Code
Wet Stamps RequiredDigital Structural
Fire Setback Enforced1

Codes

NEC Code Version
2023
Fire Code Version
2018 Building Code
Code List

2021 INTERNATIONAL BUILDING CODE

2021 INTERNATIONAL RESIDENTIAL CODE

2021 INTERNATIONAL FIRE CODE

2021 INTERNATIONAL ENERGY CONSERVATION CODE

2021 INTERNATIONAL EXISTING BUILDING CODE

2021 INTERNATIONAL FUEL GAS CODE

2021 INTERNATIONAL MECHANICAL CODE

2021 INTERNATIONAL PLUMBING CODE

2023 NATIONAL ELECTRICAL CODE

IEBC Accepted
1
ASCE Code Specification
ASCE 7-16

SolarAPP+ & submittal

Revision Required
0
New Planset Required For Module Swap
0

Stamps

Ee Stamp Required On SLD
No
Wet Stamps Required
Digital Structural
Structural Calculations Required
Yes
Stamp Location On Plans
Unspecified
Date On Stamps
Expiration Date

Fire setbacks

Fire Setback Enforced
1

Structural & loads

Wind Speed
96
Snow Load
5
Reducible Snow Load Allowed
1
Max Attachment Spacing
96
Minimum Ground On Roof
#10

Electrical

AC Disconnect Required
No
Electrical Load Calcs Required
Derates
Allowed POI
Load Side Taps,Line Side Taps,PV Breaker,Meter Adapter
Supply Tap Neutral Ground Bond Required
1
Temperature Rating
90
De Rating Ampacity
0.91
BOS Restrictions

Standard

Battery / ESS

Unique Battery Placards Needed
0
ESS Notes

Standard ESS requirements

Separate ESS Disconnect Required
No
ESS Elevation Detail Required
No

Plan set

Plan Set Requirements

Electrical permit required from the State of Washington - Labor & Industries (WA). Please see page for requirements.

Cover Page

Standard

Site

Standard

Roof Plan

Standard

Attachment Detail

Standard

Electrical Diagram

For all Line Side Connections:

  • Neutral and ground bonded in fused disconnect
  • #6 bare copper run from N/G bar to (E) MSP's GEC and crimped
  • Schedule 80 PVC must be used in between fused disconnect and MSP - only showing 2 hots and neutral
  • All other conduit can be EMT

For all Load Side Taps:

  • Schedule 80 PVC must be used in between disconnect and MSP
Label Page

Standard

Ground mount

Ground Mount Fencing Required
No
Ground Mount Notes

Standard GM requirements

Setback Front Yard
10
Setback Back Yard
5
Setback Side Yard
5
Compiled from public records, 2026. Requirements change with code cycles and local amendments. Verify with the County of Mason (WA) building department before you rely on this, and treat it as a research head start, not a ruling. Getting quotes? Run them through the quote checker first.