Solar Permit
A building permit required by local government before solar installation — adds cost and time but ensures structural and electrical safety compliance.
Solar installations require building permits from the local Authority Having Jurisdiction (AHJ) — typically the city or county building department. The permit process verifies structural adequacy (roof can support panel weight), electrical compliance (system meets NEC requirements), and fire code compliance (including rapid shutdown requirements).
Permit costs range from $150 to $1,500+ depending on jurisdiction — some progressive municipalities have streamlined solar permitting with flat fees and online submission. Many jurisdictions have adopted SolarAPP+, a federally funded tool that automates permit review for simple residential systems, enabling same-day approval.
After permit approval, the installation proceeds, followed by local inspection (structural and/or electrical inspector visits the site to verify compliance with approved plans). After passing inspection, the utility interconnection application can be finalized and Permission to Operate (PTO) issued. Reputable installers handle the entire permit and interconnection process; homeowners should verify this before signing a contract.
Real-World Example
The installer's permit application in Sacramento took 3 days via SolarAPP+; the same application in the neighboring county (without the automated system) took 6 weeks — demonstrating why permit timelines vary from days to months depending on jurisdiction.