Signs that justify an electrician's assessment include scorch marks, burning smells, frequent tripping, flickering lights, warm sockets, damaged cable you can see, and heavy reliance on extension leads. None proves a house needs rewiring. A licensed electrician has to test and inspect before anyone knows what work, if any, is required.
"Does the house need rewiring?" is a question many Dunedin homeowners ask, particularly in older homes or after buying a property. It is also a question that no article, and no single symptom, can answer. What this guide can do is explain the kinds of signs that are worth getting assessed, and what happens when you do.
Why wiring is not a one-size question
Electrical wiring does not simply "expire" on a set date. Its condition depends on the materials used, how it was installed, how it has been treated over the years, and how much demand is now placed on it. Some older installations have been maintained or upgraded in stages and remain sound. Others have had additions over many years by different people, which can leave a mixed picture.
That is why age on its own is not a diagnosis. It is a reason to ask an electrician to look, not a reason to assume the worst.
Signs that deserve an electrician's assessment
Heat, scorching or marks
Scorch marks or brown discolouration around sockets, switches or at the switchboard are a clear prompt. WorkSafe's guidance to homeowners is to look out for signs of heat discolouration and, if you see them, to turn the main switch off and contact a registered electrical worker.
Burning smells, buzzing or crackling
Unusual smells from the switchboard or an appliance, and crackling or arcing sounds, should not be ignored.
Frequent tripping
A breaker or safety switch that trips again and again can have many causes, and some of them are appliances rather than wiring. But it is a reason to have the circuit tested.
Flickering or dimming that is new or widespread
WorkSafe lists lights flickering abnormally, or several appliances not working correctly, among the signs that call for a check. One flickering bulb is rarely the issue. Persistent flickering across several rooms is worth mentioning to an electrician.
Warm sockets or plugs
A socket or plug that feels warm, or has darkened, should be taken out of use until it has been checked.
Visibly damaged or deteriorating cables
If you come across cable with cracked, crumbling or exposed insulation, for example while the roof space or a wall is open during other work, do not touch it. Let an electrician know.
Not enough power points
Homes with few sockets often end up using many extension leads and double adaptors. WorkSafe says extension cords are intended for temporary use only, and that if you need a permanent power source, you should ask a licensed electrician to install a power socket. If this describes your home, you may simply need more points added rather than a rewire.
Changes in how you use your home
Modern households add big loads over time, such as heat pumps, EV chargers and extra appliances. If you are planning any of these, an electrician can check whether your existing wiring and switchboard suit them.
What a rewire actually means
A full rewire replaces the fixed cabling throughout the house. It is a significant job and is not always what is needed. After an assessment, the outcome might be one of several:
- The wiring is in good order and needs nothing.
- Specific circuits or sections need repair or replacement.
- The switchboard or protection devices need upgrading.
- More power points or circuits are needed.
- A wider rewire is recommended, with an explanation of why.
Only a licensed electrician who has inspected and tested your installation can tell you which applies. We would be cautious of anyone who says a house needs rewiring without having looked at it.
If you are buying an older home
WorkSafe suggests that before buying a home, you get a licensed electrician or inspector to check that the installations, outbuildings and electrical equipment are safe, and that you ask the vendor about past electrical work and see the Certificates of Compliance. An assessment before purchase, such as an electrical safety inspection, can help you plan for future costs rather than being surprised by them.
Choosing an electrician
Electrical work for payment should be done by a registered electrician, and WorkSafe advises asking to see their current practising licence. For fixed wiring work you should receive a Certificate of Compliance, and some work, particularly on the main switchboard, main cable and main earth, must also be inspected by a licensed inspector arranged by your electrician.
If you are worried about the wiring in your Dunedin home, get in touch with Honest Electrical. We will inspect, test and tell you plainly what we find, including when nothing needs doing.