How to prepare for a solar inspection
The inspection is where the paper permit meets the real roof. An inspector's job is simple to state: confirm that what got installed matches what got approved, and that it's built to code. Prepare for that and you pass on the first visit; wing it and you get a re-inspection and another wait.
Rough vs final: two different visits
Many residential solar projects involve two inspections, checking different stages:
- Rough inspection looks at work that's about to be concealed — the roof attachments, flashing, and rough wiring before conduit is closed up or covers go on. The point is to see it while it's still visible.
- Final inspection looks at the completed system ready to energize — labels, disconnects, the finished electrical work, and overall code compliance.
Not every project has a separate rough inspection; it depends on the install and your AHJ. Confirm which inspections apply to yours.
What the inspector verifies
Across both visits, the inspector is checking the same fundamentals that were approved on your permit set:
- Wiring and conductors sized and run as designed
- Overcurrent protection — the right breakers, and a load-side connection that respects the 120% busbar rule
- Grounding and bonding — electrode, GEC, EGC, and array bonding present
- Rapid shutdown — the device installed and its initiator and labels in place
- Mounting and attachment — anchors into framing, flashing done right
- Labels and placards — the service directory, disconnect markings, and rapid-shutdown label
The single most important principle: the install must match the approved plans. If you changed something in the field, the change may need to be documented or re-approved.
The most common failure points
Re-inspections are usually caused by small, avoidable things:
| Failure | Fix before the visit |
|---|---|
| Missing or wrong labels | Install every label on the approved schedule |
| Install doesn't match plans | Document field changes; get re-approval if needed |
| Rapid shutdown not initiating | Verify the device and initiator function |
| Grounding gaps | Confirm electrode, GEC, EGC, array bonding |
| Disconnect inaccessible/unlabeled | Ensure access and correct marking |
Labels alone account for a surprising share of failed finals — they're cheap to get right and easy to forget.
A pre-inspection checklist
Before the inspector arrives, have ready:
- The approved permit and stamped plans on site
- Access to the array, service panel, and all disconnects
- All labels and placards installed per the approved schedule
- Any field-change documentation if the install deviated from plans
- The installing electrician available if your AHJ expects it
Physical access is underrated — an inspector who can't reach a disconnect or safely get to the array may not be able to complete the inspection at all.
After you pass
A passed final inspection clears the AHJ side, but you're not done: the sign-off has to reach your utility so it can grant permission to operate (PTO) — the final authorization to energize. Make sure the inspection result gets to the utility promptly so your PTO isn't held up by paperwork.
Requirements vary by jurisdiction, so confirm which inspections apply and what your AHJ expects, and keep a licensed electrician involved through inspection and commissioning. Match the install to the approved plans, get the labels right, and provide clean access — that's what turns an inspection into a formality instead of a setback.
FAQ
What does a solar inspector check?
The inspector verifies the installed system matches the approved plans — wiring, overcurrent protection, grounding, rapid shutdown, labels, and mounting — and that the work is done to code. A final inspection is required before the utility grants permission to operate.
What is the difference between a rough and a final inspection?
A rough inspection checks work that will be covered up, such as mounting and rough wiring, before it's concealed. The final inspection checks the completed, energizable system, including labels and disconnects.
What causes a solar inspection to fail?
Common failures are missing or wrong labels, work that doesn't match the approved plans, missing rapid-shutdown initiation, grounding gaps, and inaccessible or unlabeled disconnects.
Related: Permits & inspections
Educational reference, reviewed 2026-07. A design aid, not a substitute for a licensed electrician or PE. Confirm the enforced NEC edition and local amendments with your AHJ.
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