There are many houses built in Adelaide during the 1920s that were constructed to a very good standard. The houses have unique architecture with wonderful timber flooring and ceiling design. These heritage homes provide an ideal living environment. But the electric installations in these houses may not comply with the current standards. Even a small electrical problem can become a major hazard. Still today in 2026, many homes in Adelaide are facing electrical problems due to overloaded household equipment and electrical installations.
This guide contains all the details on old wiring, the need to rewire your house, and when you should consider hiring electricians in Adelaide.
Why Old Wiring Is Dangerous
The original house wiring in many Adelaide heritage homes built during the 1920s was designed for a very different way of living. People did not have many household appliances at that time. Today we use air conditioners, computers, televisions, and all sorts of heavy appliances.
Old electrical systems were never designed to handle such an electrical load. Overheating and power surges endanger people’s lives.
Electrical installations have been modernised in many heritage houses today. But somewhere, the original electrical system has been preserved and can create hazardous issues.
What 1920s Wiring Actually Looks Like
The most prevalent form of wiring found in heritage properties is cloth-insulated wiring. Rather than modern plastic wires, these wires are made from cloth and rubber insulation. At the same time, these types of wires worked great during the 1920s. These materials were not built to last forever.
Overusing insulation leads to wear and tear. Hard and brittle insulation then results in exposed wires. This is because home rewiring is necessary.
We also often see ceramic or porcelain insulators in these older properties, where wires were supported against the timber frame using these fittings. While these materials suited the era, the wiring itself has likely exceeded its expected lifespan by now.
On top of that, many heritage homes still have old fuse boxes that weren’t designed to handle the electrical loads we put on them today. They don’t offer the same level of protection as a modern switchboard.
Warning Signs Your Heritage Property Needs Electrical Help
Some of the main electrical issues that should be checked in old homes include:
- Flickering lights with no obvious cause may indicate worn-out electrical wiring.
- Wires overheating even at light electrical loads must never be ignored.
- Blown fuses and tripped circuits are actual indicators of old wiring.
- The presence of a burning smell near switches or electrical sockets indicates overheated wiring.
In case your home has never undergone any major electrical upgrade, you are advised to have your home’s electrical system thoroughly inspected by qualified electricians in Adelaide.
Why Home Rewiring Matters
When we carry out a full home rewire, we install modern wiring that meets current Australian standards. This improves the overall safety of your home, allows your electrical system to handle all your modern appliances and devices, and can even boost your property’s value.
We know a home rewire can sound like a massive undertaking. Our experienced electricians in Adelaide carry out the work in a way that respects and preserves your home’s heritage character. Our goal is always to make the necessary improvements without compromising the look and feel of your property.
How We Can Help
We make sure to inspect the entire installation on your property. Our qualified electricians can easily spot old or faulty wiring that needs an upgrade. It could be from your power points or electrical installations.
After the inspection, our electrician will brief you on the best upgrade choices for you. We always recommend working with a licensed professional, not just because it’s best practice, but because all work must comply with Australian electrical regulations.
Electrical Safety Tips in Australia for Homeowners
Some electrical safety tips that you can apply to keep your home safe are as follows:
- Get a professional inspection done regularly. It’s the most reliable way to catch electrical issues early.
- Don’t overload your switchboards or extension leads. We can help you get additional power outlets instead.
- Always replace any damaged switches or cords to ensure safety.
- Swap out broken power points straight away. They are not something to leave for later.
- Never ignore sparking or overheating. These are serious warning signs.
- Check your safety switches. Install safety alarms and test them according to the manufacturer’s instructions.
These tips do not require any specific skill. However, these electrical safety tips in Australia will protect you from costly repairs and keep all household members safe.
Let’s Save Heritage Houses in Adelaide Together
Heritage houses are an integral part of Adelaide’s history, and we at Arena Electrical Group can help owners care for them, as wiring installed in the 1920s was never intended for use under modern electrical conditions.
In cooperation with professional electricians from Adelaide, you can identify potential issues and make an informed decision on necessary actions, ranging from partial renovation to complete rewiring. This way, you will get the chance to enjoy all the beauty of your heritage house with full security.
Frequently Asked Questions:
Q: How do I know if my Adelaide heritage home needs rewiring?
A: Warning signs include flickering lights, frequently tripped circuits or blown fuses, a burning smell near power points or switches, and wiring that hasn’t been updated since the 1950s or earlier. If your home was built in the 1920s–1950s and has never had a full electrical upgrade, we recommend booking a professional electrical inspection.
Q: How much does it cost to rewire an old house in Adelaide?
A: The cost to rewire an old house in Adelaide varies depending on the size of the property, the extent of the existing wiring, and whether it has plaster or timber walls. Heritage homes with plaster walls can be more complex. Contact Arena Electrical Group for a free, no-obligation quote tailored to your home.
Q: Can heritage homes be rewired without damaging walls?
A: Yes — in many cases. Our licensed electricians use techniques that minimise the need to open walls, particularly in homes with original plaster or ornate finishes. We’ll assess your home and recommend the least invasive approach while meeting all current Australian standards.
Q: Is it safe to leave original 1920s wiring in place?
A: No, it is not safe to leave original cloth-insulated wiring from the 1920s in active use. The insulation degrades over time, creating a serious fire and electrocution risk — especially with the electrical loads of modern appliances. An electrical inspection will confirm the extent of the risk.
Q: Do I need council approval to rewire a heritage home in Adelaide?
A: Electrical work in South Australia must be carried out by a licensed electrician and notified to the relevant authority. For heritage-listed properties, you may also need to consult your local council. Arena Electrical Group handles all compliance and notifications as part of our service.
Q: How long does a full home rewire take in Adelaide?
A: For a typical 3–4 bedroom Adelaide heritage home, a full rewire generally takes 3–5 days depending on the complexity of the existing system and wall construction. We’ll give you a clear timeline before any work begins.