How often should you inspect an electrical panel?
Updated July 2026
Have a licensed electrician inspect your main electrical panel every 3 to 5 years, and sooner if the home is over 25 years old or still runs a known hazard brand like Federal Pacific (FPE) Stab-Lok or Zinsco. The failure modes here hide behind the cover: loose lug connections, corroded bus bars, and breakers running hot all arc where you cannot see them, and arcing is how panels start fires. Replacing a problem panel runs $1,500–3,000, which is small against the alternative.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Newer home (under 25 years), no issues | Every 5 years | Baseline check for a modern panel |
| Home over 25 years old | Every 3 years | Connections loosen and components age |
| Federal Pacific or Zinsco panel | Inspect now, plan replacement | These brands are linked to breakers that fail to trip |
| Buzzing, warm cover, or burning smell | Call now | Signs of active arcing or a loose connection |
| Before adding an EV charger or heat pump | Inspect and load-calc | New large loads may need a service upgrade |
| After a nearby lightning strike or surge | Inspect | Surges can damage the bus and breakers |
| Flickering lights on multiple circuits | Inspect | Can signal a loose main or neutral |
The cost of skipping it
What skipping it costs: a neglected panel fails in the most expensive way possible, as a fire. Loose connections heat up every time a big load switches on, slowly cooking the insulation until it arcs; the U.S. Consumer Product Safety Commission has tied hazard-brand panels to breakers that fail to trip on an overload. Best case you are looking at a $1,500–3,000 panel replacement; worst case is a structure fire. A pro inspection is typically $150–350, and often folds into other electrical work. With an FPE or Zinsco panel, budget for replacement regardless of how it looks.
How to do it (1–2 hours · licensed electrician, $150–350)
- Hire a licensed electrician; opening a live panel is not a DIY inspection, since the main lugs stay energized even with the main breaker off.
- Ask them to thermal-scan or check for hot spots at breaker and lug connections under load.
- Have them confirm the panel brand and model against known-hazard lists (FPE Stab-Lok, Zinsco, some Challenger).
- Between pro visits, use your senses: a warm or discolored cover, a buzzing or crackling sound, or a burning smell all mean call now.
- Keep the panel accessible and dry; the code clearance in front is 36 inches for a reason.
- Label circuits and note the panel age and amperage (100A vs 200A) for future upgrades.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing panel inspections schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
How do I know if I have a dangerous Federal Pacific or Zinsco panel?
Open the outer door, not the inner cover, and read the panel label and breaker brand. Federal Pacific panels usually say Stab-Lok and often have a red strip on the breaker handles; Zinsco panels (also branded GTE-Sylvania) have distinctive thin, colorful breakers. Both are associated with breakers that can fail to trip during an overload or short, leaving no protection. If you find either, have an electrician confirm it and price a replacement, typically $1,500–3,000; most owners replace rather than gamble.
How long does an electrical panel last?
A quality panel generally lasts 25 to 40 years, but lifespan is not the only reason to replace one. Many 100-amp panels installed decades ago are simply out of room and out of capacity for today's EV chargers, heat pumps, and induction ranges, which pushes owners to a 200-amp service. Hazard brands are a replace-regardless case at any age. See how often you might replace the panel for the full picture.
What are the warning signs of an electrical panel problem?
Call an electrician promptly for any of these: a breaker that trips repeatedly or feels warm, a buzzing, humming, or crackling sound from the panel, a burning or fishy-plastic smell, scorch marks or rust inside, or flickering lights across several rooms at once. These point to loose connections, overloaded circuits, or moisture intrusion, all of which can arc. A buzzing panel in particular is never normal and should be checked the same week.
Do I need to upgrade my panel for an EV charger?
Sometimes. A Level 2 home charger draws a continuous 40 to 48 amps, a big chunk of a 100-amp service, so an electrician will run a load calculation to see if your existing panel can handle it. Many older 100-amp panels need either a 200-amp upgrade or a smart load-management device that shares capacity. Bundling that assessment into your routine 3-to-5-year inspection is the efficient way to plan for it before you buy the car.