Whether you are buying or selling a home, updating your insurance, or simply checking that your house is safe, an electrical inspection can surface problems you did not know existed. Knowing what commonly fails helps you prepare, budget for repairs, and avoid last-minute surprises that can delay a closing.
Here are the issues that most often fail a home electrical inspection, grouped by where they show up, and what to do about them.
Note: a home inspector documents concerns and recommends a licensed electrician, while an electrical safety inspection evaluates the system against code. Requirements can vary by jurisdiction and code cycle, so confirm specifics locally.
Electrical panel problems
The panel is the heart of your electrical system, so problems here are among the most serious red flags.
- Outdated or hazardous panels. Certain panel brands, most notably Federal Pacific Electric (FPE) Stab-Lok and Zinsco, have a documented history of breakers that may fail to trip during a fault. These are frequently flagged for replacement.
- Double-tapped breakers. This is when two wires are connected to a single breaker that is listed for only one. The connection can loosen over time and overheat.
- Over-fused or mismatched circuits. Using a breaker larger than the wire is rated for, such as a 20 amp breaker on 14 gauge wire, removes the protection the breaker is supposed to provide.
- Overloaded or undersized panels. A panel with no room for new circuits, or a service too small for the home’s demands, often fails.
- Missing labeling. A panel without a clear, accurate circuit directory is commonly cited, and clear labels also help first responders.
- Signs of distress. Corrosion, moisture, or evidence of overheating inside the panel are automatic concerns.
Wiring problems
Older or improperly modified wiring is a frequent cause of failure.
- Active knob-and-tube wiring. Common in homes built before the 1950s, this wiring lacks a ground and is often flagged. Many insurers will not cover a home with active knob-and-tube.
- Aluminum branch wiring. Used in many homes built from about 1965 to 1973, aluminum wiring can loosen and overheat at connections if it is not corrected with approved connectors.
- Improper grounding and bonding. Missing or incorrect grounding leaves the system and your electronics unprotected.
- Open splices and junction boxes. Wire connections must be inside an approved, covered box. Exposed splices or open boxes are a common defect.
- Damaged or exposed wiring. Frayed, nicked, or unprotected cable is a safety hazard.
Outlet, GFCI, and AFCI problems
Inspectors test outlets throughout the home, and these issues come up often.
- Missing GFCI protection. Ground-fault circuit interrupter protection is required in wet or damp locations such as kitchens, bathrooms, garages, laundry areas, and outdoors, under NEC 210.8. Older homes frequently lack it.
- Missing AFCI protection. Arc-fault circuit interrupter protection is required for many circuits serving habitable rooms, such as bedrooms and living areas, under NEC 210.12. Homes built before it was required often fail on this point.
- Ungrounded outlets. Three-prong outlets on two-wire circuits without proper protection are a common issue.
- Reversed polarity and open grounds. Miswired outlets, where hot and neutral are swapped or the ground is not connected, are flagged because they create shock and equipment risks.
Safety devices and other common issues
- Missing or nonfunctional smoke and carbon monoxide alarms. These are often part of an inspection, and missing or outdated alarms can be cited.
- Improper DIY work. Unpermitted or amateur wiring, including extension cords used as permanent wiring, is a frequent finding.
- Missing outdoor protection. Outlets in wet locations without weatherproof covers, or fixtures not rated for their location, can fail.
Quick reference: common failures
| Category | Common failures |
|---|---|
| Panel | FPE or Zinsco panels, double-taps, over-fusing, no labeling, overheating |
| Wiring | Knob-and-tube, aluminum branch wiring, poor grounding, open splices |
| Outlets | Missing GFCI or AFCI, ungrounded outlets, reversed polarity |
| Safety devices | Missing or outdated smoke and CO alarms |
| Other | Unpermitted DIY work, missing weatherproof covers |
What happens if your home fails
A failed inspection is not the end of the road. The inspector documents each issue, and a licensed electrician corrects the problems, often followed by a re-inspection to confirm the repairs. Many of these items are straightforward fixes, such as adding GFCI protection, correcting a double-tap, or replacing a hazardous panel. Addressing them promptly keeps a sale on track and reassures insurers.
How to prepare before inspection day
If you want to get ahead of problems, a pre-listing or pre-purchase electrical inspection is worth considering. It identifies the issues in advance so you can budget and make repairs on your own timeline rather than under the pressure of a closing deadline. Simple steps like labeling your panel, testing GFCIs and alarms, and having any known concerns evaluated go a long way.
