It is a hard judgement to make from the outside, and the cost of getting it wrong runs in both directions. Call unnecessarily and you pay an after-hours premium for something that could have waited. Wait when you should not, and a fault that was contained becomes one that is not.
Here is how to think about it.
Call immediately
These involve evidence of heat, arcing, or current going somewhere it should not.
- Burning smells. A distinct fishy or acrid plastic smell means insulation is overheating. It is often not coming from where the smell is strongest.
- Smoke, sparks, or scorch marks. A brief spark when unplugging is normal. Persistent arcing and black marks are not.
- Any shock. Even a mild one from an appliance, switch, or faucet. Severity of the shock is a poor guide to severity of the fault.
- Heat. An outlet, switch plate, or cord that is warm to the touch.
- Water reaching electrical components. After a leak or flood, near outlets, the panel, or wiring.
- Buzzing or crackling from the panel.
- A breaker that will not stay reset. It is detecting a fault it will not tolerate.
If you can smell burning or see smoke and suspect fire, leave the building and call emergency services first. Electrical fires can smoulder inside wall cavities for a long time before becoming visible.
Usually safe to wait, if you isolate the circuit
- A single dead outlet with no heat or smell
- A light fixture that has stopped working
- A breaker that trips once under obvious heavy load and then holds
- A switch that has become unreliable but is not warm or buzzing
- Flickering confined to one fixture
The qualifier matters. Switch off the breaker feeding the affected area. That single action resolves the immediate risk in most situations and converts an after-hours call into a normal appointment.
The ambiguous middle
Some situations sit between the two, and these are the ones worth thinking about carefully.
Lights brightening in one part of the house while dimming in another. This pattern suggests a lost neutral, which can push damaging voltage onto electronics. Treat it as urgent even though nothing appears dramatic.
A partial power loss when neighbours still have power. Losing half the house points to something at the service or panel rather than a branch circuit.
An intermittent burning smell that has stopped. It has not resolved itself. Something got hot enough to smell, and whatever caused that is still there.
Repeated GFCI trips outdoors during rain. The device is working correctly and detecting real leakage. Not usually an emergency, but it needs finding rather than resetting indefinitely.
What to say when you call
The pattern is the useful part. When did it start, what else was running, has anything changed recently: new appliance, recent work, a storm, water. That information genuinely narrows the diagnosis and can be the difference between a one-hour visit and a three-hour one.
About after-hours costs
Most electricians charge a higher rate outside standard hours, and many apply a call-out or diagnostic fee that stands whether or not the repair happens that visit. Ask for both figures before agreeing to a visit. That is a normal question and any reputable electrician will answer it directly.
If the situation belongs in the “call immediately” list, pay the premium. If it is in the second list, isolate the circuit and call in the morning.
