What Factors Can Increase the Cost of Rewiring a House in an Older Melbourne Home?
If you own a weatherboard cottage in Frankston, a double-brick post-war home in Mount Eliza, or a Federation-era property in Mornington, you’ve probably wondered why rewiring quotes can vary so much. The truth is, no two older homes are the same, and a handful of factors can quietly push the final price up before a single cable is run.
With 16 years of rewiring homes across the Peninsula and Bayside, our team at Safelec can usually spot the cost drivers in the first ten minutes of an inspection. Here’s an honest look at what factors can increase the cost of rewiring a house, drawn from what we actually see on site.
1. The Age and Type of Existing Wiring
The older the home, the more likely it still contains wiring that needs to be carefully removed before new cabling goes in. From what we see on the Peninsula, homes built before the 1970s often have VIR (vulcanised India rubber) or cotton-insulated cables. These cables can be brittle, hazardous, and slow to strip out safely.
If your switchboard still uses ceramic fuses, that’s another sign of a system that was never designed to handle modern appliances, induction cooktops, or air conditioning loads. Each one of these factors adds labour hours, which is the single biggest driver of cost in any rewiring job.
2. Wall Construction and Access
This is where Melbourne’s older homes really separate themselves from new builds. Running new cables through modern plasterboard and a timber frame is straightforward. Running them through double-brick, solid plaster, or lath-and-plaster walls is not.
Older Mornington Peninsula homes often have:
- Double-brick external and internal walls that require chasing or careful fishing of cables
- Lath-and-plaster ceilings that can crack if not handled with care
- Suspended timber floors with limited subfloor crawl space
- Heritage features like decorative cornices or pressed-metal ceilings that need to be preserved
Each of these adds time, careful planning, and sometimes patch-up work. The trade-off is worth it for keeping the character of your home, but it does affect the quote. If you’re weighing up a full rewire, our house rewiring service in Mornington Peninsula walks through both full and partial options so you can match the scope to your budget.
3. Size and Number of Circuits
A two-bedroom unit needs far less cable, fewer power points, and fewer light fittings than a four-bedroom family home with a granny flat out the back. Two-storey homes add more time, too, since cables need to be routed between floors without disturbing too much plaster or flooring.
Most modern households also need more circuits than older homes were designed for. When we rewire a 1960s home, we’re often adding dedicated circuits for induction cooktops, ducted heating, EV chargers, and home office setups that simply didn’t exist when the original wiring was installed. More circuits mean more cable, more labour, and more breakers on the new switchboard.
4. Switchboard Condition
Most older homes need a switchboard upgrade as part of the rewire. If your current board still has rewirable fuses, no RCDs (safety switches), or is undersized for today’s demand, it must be replaced to comply with AS/NZS 3000:2018, Australia’s current Wiring Rules.
A new switchboard with proper RCD protection is a real cost on the quote, but it’s not optional when the existing one is unsafe or non-compliant. We’ve also seen plenty of older boards on the Peninsula that have been added to over the years, with circuits stacked on top of circuits. Tidying that up properly during a rewire is what keeps your home safe long term.
5. Hidden Surprises Behind the Walls
This is the factor most homeowners don’t think about. Once we start working in an older home, it’s common to find asbestos in walls or ceilings, which requires licensed removal before work continues. We also regularly find DIY wiring from previous owners that doesn’t meet code, water-damaged or rodent-damaged cabling, and old junctions buried inside ceilings that were never meant to be permanent.
A good electrician will inspect the property first and flag potential issues in the quote, but some surprises only show up once the walls open up. That’s why we build a small contingency into our recommendations.
6. Renovations, Smart Home Features, and Future Wiring
If you’re rewiring as part of a bigger renovation, the cost can rise based on what you’re adding. Smart lighting, extra data cabling, USB power points, outdoor lighting, EV charger pre-wiring, and solar-ready circuits all add value, but they also add to the bill.
The good news is that doing this work in one go is far cheaper than coming back later. We always recommend thinking five to ten years ahead when planning a rewire.
Getting an Accurate Quote for Your Older Melbourne Home
Every older home tells its own story, and the only way to get a reliable rewiring quote is an on-site assessment. If you’d like a clear, transparent breakdown for your property, get in touch with the Safelec team for a free quote across the Mornington Peninsula and Bayside.
- Check our service for house rewiring
- Check our service for switchboard upgrade
