Field Notes · Permitting · Residential
Do solar panels need a permit?
Yes. The useful question is what has to be in the package, and why the rejections almost always trace back to the survey rather than the drafting.
Yes. Effectively every grid-connected solar installation in the United States needs a permit before work starts and an inspection after it finishes. The useful question is not whether, it is what has to be in the package, and that is where jobs stall.
One thing to get straight first, because it causes more confusion than anything else: the permit and the utility interconnection are two separate approvals from two separate organisations. The building department decides whether you may build it. The utility decides whether you may connect it. Passing one tells you nothing about the other, and they run on independent clocks. Plenty of finished arrays sit dark waiting on the second one.
What you are usually applying for
Most residential jobs need two permits, sometimes combined into one application:
- A building permit, covering the structural attachment of the array to the roof.
- An electrical permit, covering the wiring, the interconnection point, disconnects, and grounding.
Add a battery and you may pick up a separate fire-code review and, in some places, a different inspector on a different visit. The storage capture list is in what a battery adds to the site survey.
Worth saying plainly
Requirements vary by authority having jurisdiction, and they vary more than people expect between two towns in the same county. Nothing below is a substitute for reading your AHJ's own solar submittal checklist. What is consistent is the list of documents, not the rules applied to them.
What goes in the package
Across jurisdictions the submittal is remarkably consistent in shape, even when the review standards differ. A complete set is normally:
| Sheet | What it has to show |
|---|---|
| Site plan | Property boundaries, structure footprint, array location, setbacks, and access pathways. Dimensioned. |
| Roof plan | Every plane with azimuth and pitch, module layout, attachment spacing, obstructions, and fire-service access and ventilation pathways. |
| Structural detail and calculations | Rafter or truss size, spacing and span, attachment type and spacing, and the load calculation showing the roof carries the array under local wind and snow loading. This is the sheet that needs a professional engineer's stamp in most places. |
| Electrical single-line diagram | Modules through inverter to point of interconnection, with conductor sizing, overcurrent protection, disconnects, and grounding. |
| Load calculation | Showing the existing service can accept the new source, referencing the bus bar rating rather than the main breaker rating. |
| Placard and labeling plan | Required signage and its locations. |
| Equipment documentation | Listing information and specification sheets for modules, inverters, racking, and storage if present. |
Why packages get rejected
In our experience the rejections cluster into a short list, and almost all of them trace back to the survey rather than the drafting.
- Structure that was inferred rather than measured. If nobody went in the attic, the rafter size and span on the structural sheet is an assumption, and reviewers catch it.
- Bus bar rating missing or wrong. The load calculation is drawn against the main breaker rating because that is the only label anyone photographed. This is the most common single cause we see.
- Fire access pathways not shown, or shown but not dimensioned, or drawn without the obstructions that actually exist on the roof.
- Obstruction locations that do not match the site. A vent measured by eye ends up two feet from where it is, and the module layout becomes unbuildable.
- Grounding path not clearly traced on the single-line.
Every one of those is a capture failure, not a design failure. That is the whole argument for treating the survey as a fixed spec rather than a site visit, which is what the site survey checklist is for.
What a rejection costs
The permit fee is not the cost. The cost is the cycle: resubmittal queue, a second review, and frequently a second site visit to get the measurement that was missing the first time. That is typically one to three weeks of calendar time on a job that was already sold, plus the crew hours. Against a survey, the arithmetic is not close, and we worked it through in the algorithm no one is running.
How we do it
We deliver permit sets stamped and sealed by a licensed professional engineer, structural and electrical, permit-ready six days from the survey. The survey itself comes back within 48 hours of the visit, roof and electrical in a single trip, with a 3D roof model accurate to less than an inch, at a flat $275 per site. More than 50,000 surveys over seven years, nationwide.
The reason the six days holds is the same reason the 48 hours holds: the plan set is drawn from a complete capture, so there is nothing to go back for.
Getting packages kicked back?
Send us a rejection notice and we will tell you which capture step it traces to.
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