Solar Sanity Checksolar, decoded Independent. Nothing you type leaves your browser.

City of Willows (CA)

California Authority Having Jurisdiction Solar permitting requirements
NEC Code Version2023
Fire Code Version2018 Building Code
SolarAPP+ StatusTargeted
Wet Stamps RequiredNone
Fire Setback Enforced1

Codes

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

2025 CALIFORNIA BUILDING CODE

2025 CALIFORNIA ELECTRICAL CODE

2025 CALIFORNIA FIRE CODE

2025 CALIFORNIA PLUMBING CODE

2025 CALIFORNIA MECHANICAL CODE

2025 CALIFORNIA ENERGY CODE

2025 CALIFORNIA RESIDENTIAL CODE

2025 CALIFORNIA ADMINISTRATIVE CODE

ASCE Code Specification
ASCE 7-16

SolarAPP+ & submittal

SolarAPP+ Status
Targeted
Any SolarAPP+ Restrictions
1
SolarAPP+ Restrictions
MPU,Derate
How Many Plansets Required
3
Revision Required
0
New Planset Required For Module Swap
0

Stamps

Ee Stamp Required On SLD
No
Wet Stamps Required
None
Structural Calculations Required
Yes - Existing PV
Ee Stamp Notes
EE stamp required when adding PV to a home with existing PV
Stamp Location On Plans
Unspecified
Date On Stamps
Expiration Date

Fire setbacks

Fire Setback Enforced
1
Setback Notes

Standard

Structural & loads

Wind Speed
110
Wind Notes

Exposure Category C

Snow Load
5
Snow Load Notes

N/A

Reducible Snow Load Allowed
1
Max Attachment Spacing
96
Structural Notes
PE digital stamped plans and calcs required when: * RACKING & SOLAR ARRAY EXCEED 3 POUNDS PSF - (Less than 3 lbs must still provide calculations on plans) * Adding PV to a home with existing PV
Minimum Ground On Roof
#10

Electrical

Electrical Load Calcs Required
Derates
Allowed POI
Line Side Taps,PV Breaker,Load Side Taps,Meter Adapter
Panel Schedule Required
Partial Home Backup
Temperature Rating
90
De Rating Ampacity
0.96

Battery / ESS

Unique Battery Placards Needed
0
ESS Notes

Standard

Separate ESS Disconnect Required
ESS Disconnect
ESS Elevation Detail Required
No

Plan set

Plan Set Requirements

RACKING & SOLAR ARRAY EXCEED 3 POUNDS PSF (Less than 3 lbs must still provide calculations on plans)

Electrical Diagram

Centerfed 120%: Sometimes (See Design Notes) 120% rule allowed per CEC 705.12(B)(2)(3)(d)

Ground mount

Ground Mount Fencing Required
Yes
Ground Mount Notes

Ground mounts need to go through design review with planning department

Compiled from public records, 2026. Requirements change with code cycles and local amendments. Verify with the City of Willows (CA) 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.