Solar Permits & Interconnection: How the Process Works

Two separate approvals

A building/electrical permit (from your city or county) verifies the install is safe and code-compliant. An interconnection agreement (from your utility) lets you export solar power to the grid and sets your net metering terms. Both are required.

Timeline and who handles it

Most installers handle permitting as part of the job — you rarely file yourself. Typical timelines: permit 1–4 weeks, utility review 1–6 weeks, inspection 1–2 weeks. Overall, expect 3–12 weeks from contract to Permission to Operate (PTO).

Why it matters for your payback

Delays don't change the math, but some utilities have net-metering program caps or changing rules — locking in your interconnection date can matter. Ask your installer for a written timeline and what happens if the utility changes terms mid-process.

Do I need a permit for solar panels?

Yes — a building/electrical permit from your local jurisdiction plus a utility interconnection agreement. Installers normally handle both.

How long does solar permitting take?

Typically 3–12 weeks total: permit 1–4 weeks, utility review 1–6 weeks, inspection 1–2 weeks, depending on your city and utility.

What is PTO in solar?

Permission to Operate — the utility's final approval that lets you turn the system on and start exporting power.