Electrical work for new construction, remodeling, and major additions generally gets reviewed twice by an inspector from the local building code office, and the goal of both visits is simple: confirm that the installation follows the applicable codes and is safe to energize. Most failures found at rough-in trace back to grounding, so reviewing electrical grounding systems before the inspector arrives saves a second visit. Inspections also happen for other reasons, such as when you are buying a house or putting one up for sale, and knowing the checkpoints helps in every case.
The Rough-In Inspection
The first visit, called the rough-in inspection, happens while the walls are open and before drywall goes up. This is where the residential electrical wiring code gets its first real test, because the inspector can see every cable, box, and splice without any finish material in the way.
What Inspectors Check at Rough-In
- Wire gauge matches the circuit breaker rating for every run
- Cables are stapled within 12 inches of boxes and every 4.5 feet along the run
- Junction boxes are installed flush with the finished wall surface and remain accessible
- All splices sit inside boxes with approved connectors, never loose in the wall
- Ground wires are present and connected in every box
- Nail plates protect cables running through studs within 1.25 inches of the face
Common Rough-In Failures
Unstapled cables, missing nail plates, undersized boxes, and splices without boxes account for most failed first visits. Each one is quick to fix while the walls are open and expensive to fix after drywall, which is why the inspection is scheduled before the finish stage.
The rough-in is also the moment to coordinate with other trades. Insulation, drywall, and finish crews all work around the wiring, so the inspection has to happen before they close the walls. Scheduling the call as soon as the last cable is run keeps the project moving instead of stopping at the drywall stage.
| Stage | When It Happens | What Gets Verified | Typical Outcome |
|---|---|---|---|
| Rough-in | After wiring, before drywall | Cable support, boxes, splices, grounds | Corrections are cheap to make |
| Final | After devices and panel trim-out | GFCI, AFCI, labeling, service entrance | System is cleared to stay energized |
The Final Inspection
After the trim-out, when devices, fixtures, and the panel are installed, the inspector returns for the final visit. Even when a homeowner does the rough work, most jurisdictions expect licensed electrical services to handle the final connections and panel work, because that is where the risk concentrates.
Final Walkthrough Items
- Every receptacle, switch, and fixture is installed and secured
- GFCI protection covers kitchen, bath, garage, and outdoor circuits
- AFCI protection covers bedroom and living-area circuits
- Breakers are labeled and double-tapped terminals are corrected
- Smoke and carbon monoxide detectors are interconnected where required
- The service entrance and meter base pass the utility’s requirements
A failed final inspection is not the end of the project. The inspector issues a correction notice listing each item, the electrician fixes them, and a re-inspection clears the work, usually at a reduced fee. The outcome that hurts is a failed visit caused by something visible from the doorway, such as an unlabeled panel or an uncovered junction box.
Grounding and Bonding Checkpoints
Inspectors treat earthing and electrical safety as a single system, and the panel is where they look first. The grounding electrode, the bonding jumpers, and the equipment grounds all have to be present and tight, because a ground that is merely connected is not the same as a ground that is properly sized and clamped.
What the Panel Must Show
- A grounding electrode conductor connects the panel to a properly driven ground rod
- Metal water pipes and structural steel are bonded to the system
- Subpanels keep neutrals and grounds on separate buses
- Every circuit has an equipment ground back to the panel
- Ground clamps are tight and corrosion-free
Bonding gets checked with the same care as grounding. The inspector confirms that the water line, the gas line where required, and any metal framing are tied together so a fault cannot create a dangerous difference in voltage between metal parts a person might touch.
Testing Ground Resistance
A ground rod must be driven to its full eight-foot length, and a qualified tester can verify the resistance of the earth connection. High resistance readings usually mean the rod is too short, the soil is dry, or the clamp is loose, all of which are corrected before the final sign-off.
Common Reasons Inspections Fail
Overloaded circuits and short circuits are the conditions that get flagged most often, and most failures fall into a short list of recurring problems that are easy to prevent during the rough-in stage. Knowing the list before the inspector arrives keeps the visit to a single trip.
- Overfused circuits, where a 20-amp breaker protects 14-gauge wire
- Reversed polarity at receptacles, where hot and neutral swap positions
- Missing GFCI protection in wet areas such as kitchens and bathrooms
- Ungrounded three-prong outlets installed without a real ground
- Double-tapped breakers with two wires under one terminal
- Improper splices made with tape instead of approved connectors
How to Fix the Top Three
An overfused circuit gets a correctly sized breaker, reversed polarity gets the receptacle rewired, and a missing GFCI gets the correct device installed at the first outlet in the circuit. All three are straightforward repairs for a licensed electrician and common enough that most inspectors carry a mental checklist for them.
Failed visits are common enough that they are built into the process. What separates a smooth project from a stalled one is how quickly the corrections get made and re-scheduled, so keep the electrician’s number close until the final sign-off is on paper.
Preparing for Inspection Day
Long feeder runs also get checked for voltage drop, since undersized wire loses power before it reaches the load, so preparation starts with the wire sizing table from the code. On the day of the visit, a few simple steps keep the inspection smooth and the corrections list short.
Documents and Access to Have Ready
- The permit card posted where the inspector can see it
- The approved plans and any revision sheets
- A labeled panel schedule matching the circuits
- Clear access to the panel, the meter, and every junction box
- The work area free of debris and stored materials
A clean, organized site also speeds the visit. When the inspector can reach the panel and every box without moving ladders and material, the walkthrough takes minutes instead of an hour, and a tidy job signals that the same care went into the wiring.
Scheduling and Re-Inspection
Call for the inspection when the work is complete, not when it is almost complete, and expect the inspector within a day or two in most communities. If the visit ends with corrections, the re-inspection fee is often lower than the first, and the corrected items get checked before the final sign-off.
Keep a copy of the signed inspection report with the permit paperwork. Homeowners need it when selling, contractors need it for warranty work, and insurance companies occasionally ask for it after a claim, so the two-page report is worth more than its paper.
Inspections When Buying or Selling a Home
Buyers frequently request a look at the electrical service equipment before closing, and the same NEC requirements that govern new work guide the review of an existing house. A home inspection checks the panel for double taps, ungrounded outlets, aluminum branch wiring, and other issues that signal deferred maintenance.
What the Home Inspector Looks For
The panel cover comes off, the breakers get compared to the wire gauges, and the ground and neutral bars get checked for crowding. Old wiring methods, such as knob and tube or ungrounded two-wire circuits, often surface during the sale process and become negotiation points.
The inspector represents the community, not the contractor, so the visit is a pass-fail check against code rather than a negotiation. Questions are welcome at both visits, and asking about a correction on the spot often turns a mystery into a quick fix.
Knowing the checkpoints for both rounds of inspection keeps a project on schedule and protects the people who will live with the wiring. Whether the work is a new build, a kitchen remodel, or a sale preparation, the questions are the same: is it grounded, is it protected, and does it match the code the community enforces.