That flickering light or faint burning smell might be more than a quirk. Old wiring fails quietly until it doesn’t, and the cost of ignoring it can be a house fire. Here are 10 signs you need to rewire your house, plus who to call to confirm it before you spend a cent on guesswork.
Across Australian electrical safety guides, nearly every warning ends with the same advice: turn off the power and call a licensed electrician. We’ve ordered these signs by how often they show up and how serious they are.
1. Faze Electrical (Our Top Pick)
Faze Electrical is a Brisbane-based electrical contractor that handles residential rewiring, switchboard upgrades, and safety inspections across Australia. The Company is the logical first call when any of the signs below appear in a home.
Faze Electrical suits homeowners who want a wiring fault checked properly before committing to a full rewire. The technicians test each circuit against current Australian wiring rules rather than guessing from a quick visual look. That matters, because a visual check alone can lead to thousands of dollars in unnecessary work.
Faze Electrical offers free electrical safety inspections and backs its work with a 12-month workmanship warranty. The team also covers lighting design, solar PV wiring, and emergency repairs, so a rewire can fold into a larger renovation without juggling multiple trades. Electrical malfunctions are a recognised cause of house fires, and many are preventable with a professional check.
One honest limit: Faze Electrical does not do DIY hand-holding. The Company performs licensed work and inspections, not weekend tutorials. If you’re after a guide to opening your own switchboard, that’s not what this service is. For everyone else, a free inspection is the cheapest way to find out whether your wiring is on its last legs.
2. Burning Smells or Scorch Marks at Power Points
A burning or fishy smell near an outlet is one of the clearest signs you need to rewire your house, or at least repair a circuit fast. The smell usually means wires are overheating and their plastic coating is starting to melt.
This sign is for anyone who notices odd odours near switches, outlets, or the switchboard. If the smell comes from a power point, switch it off at the wall and unplug everything connected to it. Don’t use that outlet again until an electrician has checked it.
Scorch marks, browning, or melted plastic around a power point are a step worse. They show heat has already built up at a connection. Loose wires arc, and arcing burns. If your switchboard itself smells hot, that’s a same-day call.
One caveat. A brand-new appliance can give off a faint odour the first few times it runs, and that’s normal. The warning sign is a smell that comes from the outlet or switchboard, not the device plugged into it. If you can’t tell the difference, treat it as the wiring and get it inspected.
3. Flickering or Dimming Lights
Lights that flicker or dim across the house point to a wiring or connection fault, not a dud globe. Light fittings draw very little power, so the fixture is rarely the real problem.
This sign is for homeowners who see lights dip when a big appliance kicks in. A washing machine, air conditioner, or kettle pulling current can drag voltage down on an overloaded circuit. If only one fitting flickers, it’s probably loose and an easy fix. If several flicker together, there’s likely a connection problem in the wiring or switchboard.
Old aluminium or worn copper connections loosen over time and create resistance, which shows up as flicker. The same overloaded circuits that dim your lights often coincide with heating and cooling upgrades, so some homeowners line up an electrical fix while reviewing HVAC financing plans to budget both jobs at once.
If flickering keeps coming back, book an inspection. Repeated tripping or dimming can also point to a tired switchboard, which we cover in our guide to circuit breaker failure signs. The decision rule is simple: one fitting is a repair, the whole house is a wiring check.
4. Old Cloth-Covered, Black/Red or VIR Wiring
If your cables are wrapped in cloth, black/red insulation, or rubber, the wiring is decades old and likely due for replacement. The type and colour of your cable is the single best clue to its age.
This sign matters most for owners of older Australian homes. Modern cable is insulated in grey PVC. Older installations used vulcanised india rubber, known as VIR, which turns brittle and crumbles with age. Some old cable carries a dull lead sheath for protection. As one creator on YouTube put it, that kind of insulation “has a tendency to turn brittle and break away” over time, which leaves live parts exposed.
Cable colours give away the era too. In Australia, the older red and black conductor colours were replaced by harmonised brown and blue. A solid green earth instead of green-and-yellow points to a very old install. A house doesn’t need rewiring just because the colours are old, but old colours plus brittle insulation usually do.
The official rulebook here is AS/NZS 3000, the wiring standard that governs how Australian homes must be wired. Most public safety guides skip it entirely, which is a gap worth closing for any homeowner weighing up a rewire. Worth noting: a rewire often means a switchboard upgrade as well, and our switchboard upgrade cost guide walks through what that involves.
VIR or lead-sheathed cable is past its usable life. Grey PVC with an earth conductor, even from the 1970s, may still test fine. That’s why a circuit-by-circuit test beats a visual guess every time.
5. Mild Electric Shocks or Tingling from Switches
A small shock or tingle from a switch, tap, or appliance is a serious sign of an earthing or wiring fault. It should never be brushed off as static.
This sign is for anyone who feels a buzz when touching a light switch, a metal fan body, or a kitchen tap. Improper grounding can energise the very fittings you use every day. Those energised parts can deliver a painful shock, and in the wrong conditions a lethal one.
The cause is usually a missing or broken earth connection. The earth conductor connects to the metal body of an appliance and gives fault current a safe path away. Without it, an appliance can keep working perfectly while its metal casing sits live. You’d never know until someone touches it.
Don’t wait this one out. Stop using the switch or appliance and book an inspection. A safety audit checks for ungrounded wires and loose connections, and our electrical safety audit service exists for exactly this kind of fault. Any tingle is an inspection, not a wait-and-see.
6. Missing or Faulty Earthing (No RCD Protection)
If your switchboard has no RCD protection or your circuits lack proper earthing, the installation is missing safety basics that current rules require. This is one of the most important signs you need to rewire your house.
This sign applies to homes with an old fuse box rather than a modern switchboard with circuit breakers. An improperly grounded system is a fire and shock hazard. Ungrounded currents can also damage your devices and cause serious malfunctions.
A residual current device, or RCD, trips the circuit in a fraction of a second when it senses current leaking to earth. That’s what protects a person from a fatal shock. Older fuse boards have no RCD and often no surge protection either, which leaves both people and appliances exposed.
If you’ve ever opened a switch or socket and seen no green-and-yellow earth conductor, that circuit needs work. Some single circuits can be repaired without a full rewire, but a board with no RCD usually signals an installation old enough to rewire. The fix should bring the whole home up to RCD protection standards.
7. Not Enough Power Points (Reliance on Power Boards)
Running extension leads and power boards everywhere is a sign your wiring no longer matches how you live. In older homes, one socket per room was the standard, and that’s nowhere near enough now.
This sign is for anyone with double adaptors stacked behind the TV or leads snaking across the floor. Extension cords create extra points where a cord can kink, pinch, or short out. That leads to tripped breakers, damaged outlets, or worse. They’re meant for short-term use, not permanent wiring.
Modern homes also pull far more power than houses built decades ago. EV chargers, ducted air conditioning, and high-wattage appliances all add load that old circuits were never designed to carry. An EV charger in particular often needs a dedicated circuit and may force a switchboard upgrade if the existing capacity is too low.
You don’t always need a full rewire to add points, but a shortage of outlets usually flags an ageing installation. If you’re constantly reaching for a power board, that’s a cue to get the wiring assessed and the layout brought up to scratch.
8. Rodent or Pest Damage to Cables
Rats and mice chew cable insulation, and that exposes live wires behind your walls and ceiling. Pest damage is an underrated sign that a rewire may be needed.
This sign matters for owners of older homes with roof cavities, subfloors, or cellars. Rodents gnaw on the soft insulation around cables, and once the copper is bare, you’ve got a real risk of shock or fire. The damage is usually worst in the loft or under the floor, out of sight until something goes wrong.
If the chewing is widespread, patching individual cables isn’t enough. The safer route is rewiring affected runs with a cabling system designed to resist vermin. A pest problem and an electrical problem often travel together, so it’s worth checking both.
The catch with this one is that you rarely see it from inside the living areas. A roof-space inspection during a safety check is the realistic way to catch chewed cable before it sparks.
9. Buzzing Sounds or Warm, Discoloured Outlets
A buzzing outlet or one that feels warm to the touch is a sign of a loose or failing connection. Healthy electricity is silent, so any hum from a power point is a problem.
This sign is for anyone who hears a faint buzz at a socket or notices a switch plate that’s warm even with nothing drawing heavy power. Loose prongs, worn outlets, or fraying wire let current jump, and that jump makes the buzzing sound. The same loose connection generates heat.
An outlet that powers a heat-producing appliance like a toaster should still stay cool itself. If a power point grows hot with nothing plugged in, it may be wired incorrectly. Discolouration or browning around the socket points to heat that has already built up at the connection.
Stop using a buzzing or hot outlet and get it checked. Some of these faults are a single repair, but a pattern of warm, discoloured outlets across the house leans toward a rewire. If you’re weighing the spend, our Australian rewiring cost guide breaks down what drives the price.
10. You’re Renovating, Buying, or Extending the Home
The best time to rewire is during a renovation, purchase, or extension, when the walls are open anyway. Timing the work right can save you a fortune.
This sign is for anyone buying or remodelling an older property. Rewiring is messy. It means cutting holes and chasing cables through walls and ceilings. Doing it during a remodel is the most cost-effective option because the walls are already open and the electrician can work alongside the other trades.
When you buy a home, ask for a recent electrical inspection report or arrange one before settlement. That report tells you whether the wiring is safe for continued use. Many homeowners selecting new fixtures and finishes also coordinate sourcing so the rewire and the cosmetic work land together.
If you’re planning ahead, the cheap window to add neutral wires, data cabling, and conduit is before the plaster goes up. Our notes on pre-wiring during a build or renovation cover why retrofitting later costs several times more. Get the wiring assessed early, and the rest of the project runs smoother.
When to Book a Professional Electrical Inspection
A professional inspection is the only reliable way to confirm whether your house needs rewiring. Visual checks miss faults that only a test meter catches, so don’t let anyone quote a full rewire from a glance alone.
An electrical inspection goes beyond looking for cracked insulation or missing earths. The electrician tests each circuit for insulation breakdown between live, neutral, and earth, checks continuity, and confirms nothing is shorting. That’s how you find out which circuits are genuinely bad and which still test fine, before spending money on cables that didn’t need replacing.
Use this table to gauge how urgent a sign is and what action fits.
Faze Electrical provides free safety inspections and a 12-month workmanship warranty, which makes confirming these signs straightforward. If you’re unsure which trade you even need, our guide on how to choose an electrician sorts out residential, commercial, and emergency specialists. The rule of thumb: any immediate-urgency sign means power off and a call today.
Frequently Asked Questions
How do I know if my house needs rewiring?
You likely need rewiring if you spot several of these signs together: burning smells, whole-house flickering, frequent breaker trips, mild shocks from switches, or old cloth-covered, VIR, or red/black cable. A single sign may just need a repair. A licensed inspection that tests each circuit is the only way to confirm whether a full rewire is genuinely required.
How often should a house be rewired in Australia?
There’s no fixed schedule, but most safety guidance recommends a professional check every 10 years. Wiring installed before harmonised brown and blue colours arrived, or any home still using VIR or lead-sheathed cable, is past its safe life. Age alone isn’t proof a rewire is needed, so testing each circuit decides it rather than the calendar.
Can I do a visual inspection of my own wiring?
You can safely note outward signs like yellowed outlets, old switch styles, scorch marks, or extension leads everywhere. You should never open a switchboard or socket yourself, as that’s licensed work. A qualified electrician opens covers, tests circuits with a meter, and confirms whether the wiring is safe. Faze Electrical does not provide DIY tutorials, only licensed inspections.
Is flickering lights always a sign of bad wiring?
No. If only one fitting flickers, it’s usually a loose globe or connection at that fixture, which is a quick fix. If lights dim or flicker across the whole house, especially when a big appliance starts, that points to an overloaded circuit, a loose connection, or a tired switchboard. Whole-house flickering warrants an inspection.
Does a rewire mean upgrading the switchboard too?
Often, yes. A full rewire usually pairs with a switchboard upgrade so the home gets RCD protection and modern circuit breakers required under current Australian wiring rules. Older fuse boxes lack these safety devices. If your board has no RCD, expect the upgrade to be part of the same job rather than a separate one.
The Bottom Line
If you’ve spotted even one or two of these warning signs, the smart next move is a professional inspection rather than a guess. A test-based check tells you exactly which circuits are failing, so you only pay for the work your home truly needs. Book a free electrical safety inspection with Faze Electrical to confirm whether a rewire is on the cards, and to bring any ageing wiring up to current Australian standards.