Rough-In Electrical Inspection: What Inspectors Check, and What to Do If You Missed Yours

The rough-in electrical inspection is the last time anyone will see your wiring. Once drywall goes up, every conductor, box, staple, and splice is permanently concealed. That is why building departments treat a missed rough-in as a genuine problem rather than a paperwork oversight, and why the remedy is either destructive or requires an engineer.

This guide covers what the inspector is actually looking for, the failures that come up most often, and what your options are if the inspection was skipped.

Where rough-in sits in the sequence

Electrical work in most jurisdictions is inspected in two stages.

Rough-in happens after the electrical infrastructure is installed but before insulation and drywall. Boxes are set, cable is pulled and secured, the panel is installed, but no devices, covers, or fixtures are in place. Everything is visible.

Final happens at completion, with devices installed, circuits energized, and the system operational. The inspector verifies devices, covers, labeling, GFCI and AFCI function, and overall workmanship.

The two are not interchangeable. A final inspection cannot detect an unsupported box behind drywall, a missing nail plate, or a cable stapled too tight. That is the whole reason the rough-in exists as a separate hold point.

The checklist

Conductors and overcurrent protection

The inspector confirms the conductor size matches the breaker protecting it and the load it serves. A 20-amp breaker on 14 AWG is the classic failure — a fire risk, and an instant rejection.

Also checked: correct conductor type for the location, no undersized neutrals, appropriate multi-wire branch circuit handling, and correct breaker types where AFCI or GFCI protection is required at the panel.

Box fill, box support, and setback

Every box has a cubic-inch capacity, and every conductor, device, and clamp inside it consumes a defined portion of that volume. Overfilled boxes are among the most common rejections, especially in remodels where a circuit was extended through an existing box.

Boxes must be securely fastened to framing, not floating on the cable. Where a box will be finished with drywall, the front edge has to sit within the allowable setback from the finished surface — flush in combustible construction, and no more than ¼ inch recessed in noncombustible.

Cable support and protection

Cable has to be supported within a set distance of each box and at regular intervals along the run. Staples must be snug but not crushing the sheathing — an overdriven staple that deforms the cable jacket is a defect even though it looks tidy.

Nail plates are the item most often missed. Where cable passes through a stud, joist, or plate and sits closer than 1¼ inches to the face of the framing member, a steel protection plate is required. On a remodel where the electrician was working fast, this is the first thing a good inspector checks.

Cable in unfinished basements, attics, and crawl spaces has its own support and protection rules, including running boards or protection where cable crosses the face of framing in accessible areas.

Grounding and bonding

The grounding electrode system — ground rods, concrete-encased electrode, water pipe bond — is verified along with the bonding of the neutral and ground at the service disconnect, and the separation of neutral and ground in downstream subpanels. Neutrals and grounds bonded together in a subpanel is a frequent and consequential failure.

Equipment grounding conductors must be continuous and properly terminated at every box and device location.

Service and panel

Panel location and working clearances, conductor sizing for the service, disconnect location and accessibility, breaker arrangement, and the beginnings of the circuit directory. Working space in front of the panel is a common oversight in remodels where a closet or shelving was built around an existing panel.

Receptacle spacing and required outlets

In habitable rooms, no point along a wall line may be more than six feet from a receptacle — the practical result being receptacles at least every twelve feet, plus any wall section two feet or wider. Hallways over a certain length require a receptacle. So do specific locations at landings and outdoors.

Room by room

Kitchen. At least two 20-amp small-appliance branch circuits serving countertop receptacles. Dedicated circuits for dishwasher and disposal. Countertop receptacle spacing such that no point along the counter is more than 24 inches from a receptacle. GFCI protection on countertop receptacles. Islands and peninsulas have their own requirements, and these have changed across recent code cycles — worth confirming which edition your jurisdiction has adopted.

Bathrooms. A dedicated 20-amp circuit for bathroom receptacles. GFCI protection. A wall-switched lighting outlet at the entrance. Receptacle placement restrictions relative to the tub and shower zone.

Laundry. A dedicated 20-amp circuit for the laundry receptacle, serving no other outlets.

Garages, basements, crawl spaces. GFCI protection, required receptacle counts, and lighting outlets with switched control at entry points.

Outdoors. GFCI-protected receptacles at the front and back of a dwelling, weather-resistant devices, in-use covers, and switched entrance lighting.

Bedrooms and living areas. AFCI protection on the circuits serving them, with the specific list of required areas depending on the adopted code edition.

Which code edition applies to you

The National Electrical Code is revised on a three-year cycle, but jurisdictions adopt on their own schedule and frequently with local amendments. It is entirely normal for two neighboring counties to be running editions three years apart.

This matters because several high-visibility requirements — AFCI scope, GFCI in specific locations, kitchen island receptacles, surge protection at the service — have moved between recent editions. Building to the current published NEC when your jurisdiction adopted an earlier edition can create as much friction as building to an outdated one.

Before you wire, confirm the adopted edition and any local amendments with the building department. Before you argue with an inspector, do the same.

The most common reasons rough-in fails

In rough order of how often we encounter them in after-the-fact evaluations:

1. Missing nail plates where cable passes near the face of framing
2. Overfilled boxes, usually from extending a circuit through an existing box
3. Cable support spacing exceeded, or staples missing near boxes
4. Neutral and ground bonded together in a subpanel
5. Conductor size not matched to breaker size
6. Box setback wrong at drywall locations, or boxes not securely fastened
7. Missing or incorrectly located GFCI/AFCI protection
8. Receptacle spacing short of requirement on a wall section
9. Inadequate working clearance at the panel
10. Unsupported or unprotected cable in attics and crawl spaces

Most are cheap to correct while the walls are open, and expensive to correct afterward. That asymmetry is the entire argument for not skipping the inspection.

If the rough-in was missed

This is the situation we are called into most often. Drywall went up, the permit went stale, and the gap surfaces years later during a sale, a refinance, or an insurance inspection. Sometimes the original contractor is gone. Sometimes the homeowner did not know a permit existed.

The jurisdiction’s position is consistent: it cannot approve a final inspection for concealed work it never verified. That leaves two paths.

Remove drywall. Expose the wiring so the inspector can perform the rough-in inspection late. Thorough, and occasionally the only option — but expensive, disruptive, and in a finished home with tile, cabinetry, or trim it can be impractical.

Engineer letter. A professional engineer licensed in that state evaluates the installation using every available line of evidence and issues a sealed letter certifying compliance. Most jurisdictions accept this in place of the missed inspection, and some have a formal mechanism for it — North Carolina’s Appendix G Design Professional Inspection Form being the clearest example.

What that evaluation actually involves

It is not a rubber stamp, and an engineer who treats it as one is not doing you a favor — an unsupportable letter gets rejected and burns credibility with that department.

The evaluation typically draws on:

• Construction-phase photographs. The single most valuable evidence. Photos taken before drywall, even casual phone photos, frequently answer most of the open questions.
• Accessible areas. Panel interior, attic runs, crawl space and basement runs, unfinished storage, the underside of the structure. On many homes a surprising proportion of the installation remains visible.
• Testing. Circuit tracing, GFCI and AFCI function, polarity and ground continuity, voltage drop where relevant, and thermal imaging at the panel under load.
• Documentation. The electrician’s invoice and scope, panel schedule, approved plans, and the original permit record.
• Targeted openings. Where evidence is thin, a small number of inspection openings at representative locations — a few palm-sized cuts, patched afterward, rather than a wholesale tear-out.

If the evaluation finds a genuine defect, the letter identifies it and what correction is required. That is the right outcome: it becomes a defined repair scope instead of an unknown liability sitting behind the wall.

Practical advice

Photograph everything before drywall. Every wall, every panel, every run. It costs ten minutes and it is the difference between a straightforward engineer letter and an invasive one. Do this even when you are certain the inspection will happen on schedule.

Confirm the adopted code edition before wiring, not after.

Do not schedule the rough-in until it is genuinely ready. A failed inspection consumes a re-inspection fee and a scheduling slot, which in a busy jurisdiction can cost you a week.

If you suspect a permit was never closed, check now rather than during a transaction. Most jurisdictions publish permit status online. Finding an open permit while you have time is a minor annoyance; finding it eleven days before closing is not.

If you are already past that point, our missed-inspection engineer letter service exists for exactly this. Most letters are turned around in 24 to 48 hours.