Most solar permit rejection reasons are not engineering failures. A reviewer sends a set back because the cover sheet cites last year's code, because a fire pathway is drawn but not dimensioned, or because the one-line says something the application does not. The system would have been safe. The set did not prove it.
We prepare permit sets for installers in Massachusetts, Connecticut, New York, Rhode Island, and Pennsylvania. These are the corrections we make most often before a set goes in, and the ones we see most often on sets that come back to us after a rejection.
1. The wrong code edition on the cover
The fastest rejection is a cover sheet that names the wrong National Electrical Code. Massachusetts moved to the 2026 NEC under 527 CMR 12.00 effective April 24, 2026. A Massachusetts set that still says 2023 NEC is citing an edition that is no longer in force. The Lynn Massachusetts solar permit post shows the fix: reprint the title block on every sheet, not just the cover.
Installers who work across state lines have it harder. Our post on how solar permitting differs by state covers the other differences that travel with the code year.
2. Fire pathways drawn but not measured
Roof access pathways and ridge setbacks come from the residential and fire codes, with local amendments. Under the IRC rule many towns use, a ridge setback is at least 18 inches on each side of a horizontal ridge when the array covers 33 percent or less of the plan view roof area, and 36 inches when it covers more. Pathways are typically 36 inches wide.
A reviewer cannot scale hatching. Write the width as a number at each pathway and setback. The roof attachment layout post covers the dimensions inspectors look for in the field.
3. Busbar math that is not shown
A load-side connection has to satisfy the backfeed rules in NEC 705.12, usually the 120 percent rule for a residential panel. Many sets state the breaker size and stop. The reviewer then has to do the calculation, and some of them will not.
Show the busbar rating, the main breaker, the solar breaker, and the result on the one-line. If the panel fails, show the option chosen: a main breaker derate, a supply-side connection, or a new panel. Draw only that option.
4. Rapid shutdown and labels left generic
Rapid shutdown is required under NEC 690.12, and the labels that go with it are in 690.56. A set that says "label per code" without showing the label text and location will get a comment. The rapid shutdown placard post has the wording reviewers expect. Put the placard on the site plan where the firefighter will actually stand.
5. Cut sheets missing or marked "or equal"
The equipment on the one-line has to be the equipment in the package. A module or inverter listed as "or equal" invites a question. A missing racking or attachment data sheet invites two. The solar permit cut sheets post lists the sheets the AHJ package should include.
6. Conductor and conduit schedule that does not add up
Wire sizes, conduit fill, and overcurrent protection have to agree with each other and with the one-line. A schedule copied from the last job with the inverter changed is a common source of comments. See the conductor and conduit schedule post for the notes reviewers reject.
7. A site plan that does not locate the system
The site plan should show property lines, the house, the array, the meter, the disconnect, and the main panel, with enough dimensions that someone who has never been there can find them. Ground-mounts need setbacks to property lines written as numbers. The site plan permit mistakes post covers the rest.
8. The permit and the application describe different systems
This one is not always a permit rejection. It turns into a utility question later. If the permit set says 9.6 kW DC and the interconnection application says 10.0 kW DC, one of them is wrong. Fix it before either one is filed. In New York City, a roof replacement adds a Local Law 94 solar layer that has to agree with both.
Athol Energy prepares solar permit design sets built to avoid these comments on the first submittal. We are not the installer and we do not pull the permit. We make the set the reviewer can approve.
Questions about solar permit rejections
What is the most common reason a solar permit is rejected?
In our experience, the most common reasons are clerical: the wrong code edition on the cover, pathways without written widths, and a one-line that does not match the application or the cut sheets.
How wide are solar roof pathways?
Under the IRC rule many towns use, pathways are typically 36 inches wide. Ridge setbacks are at least 18 inches on each side when the array covers 33 percent or less of the plan view roof area, and 36 inches when it covers more. Local amendments can change this.
Does a rejected set need a new PE stamp?
If the correction changes stamped content, such as structural attachments or the electrical design, the revised sheets need to be re-stamped. A title block or label correction may not, depending on the AHJ.
If the same solar permit rejection reasons keep showing up on your jobs, send us the last three comment letters. We will tell you which of these is the pattern. Contact Athol Energy.