Why This Matters to You
Renovation electrical work is cheap to get right and expensive to get wrong, and the difference between the two is almost entirely about timing.
While the walls are open, moving a powerpoint costs nothing. Adding a light point costs very little. Running strip lighting into joinery is a five-minute decision. Once the plaster is on and the cabinetry is in, every one of those becomes a cutting, patching and repainting exercise, and some become impossible.
So the single most useful thing in this post is this: talk to your electrician at planning stage, before demolition. That conversation costs you nothing and it's where most of the value sits.
The Two Visits, and Why the Sequence Matters
Renovation electrical work happens in two distinct stages.
Rough-in happens after demolition and framing, before plaster and cabinetry. All the cable gets run, outlet and switch positions get set out, light points get located, appliance circuits get pulled in, and anything going into joinery gets prepared. This is when the layout becomes permanent.
Fit-off happens after plaster, painting, flooring and cabinetry are done. Outlets, switches and fittings get installed and terminated, appliances get connected, and the whole lot gets tested and certified.
In between, the electrician is off site and other trades work. The failure mode we see most is being called in after the cabinetry is already installed, which is how you end up with a powerpoint behind a fixed panel, or an isolation switch you have to empty a cupboard to reach.
Decisions Worth Making Before Rough-In
- Where the furniture actually goes. Bed positions decide bedside outlets and switch locations. Sketch the furniture layout, not just the walls.
- What appliances you're buying. Particularly the cooktop. Induction almost always needs its own dedicated circuit, and finding that out on delivery day is a genuinely bad week.
- Whether you want dimming. It changes the fittings, the dimmer and sometimes the wiring. Cheap to plan, expensive to retrofit.
- Any feature or strip lighting. Cove details need to be set out with the ceiling. Joinery lighting needs the cabinetmaker to allow for the channel and the cable entry.
- Where the LED drivers will live. They fail eventually, and if one is buried above a sealed ceiling, replacing it means cutting the ceiling open.
- Data, TV and wall-mounted screens. Cable behind the screen instead of down the wall is a rough-in decision only.
- Outdoor power and lighting. Alfresco, pergola, garden and shed. Much easier before the paving goes down.
- Future proofing. An EV charger circuit, or at least the board capacity for one, is far cheaper now than in three years.
What Opening Up an Older House Tends to Reveal
Across the 1960s to 1980s housing stock in Adelaide's north-east, the list is fairly predictable.
- A switchboard with no spare capacity for the circuits the renovation needs
- Rewireable fuses, or no safety switch protection at all
- Wiring extended informally over the years, sometimes without junction boxes
- Old rubber-insulated cable that has gone brittle and shouldn't be reused
- Undersized circuits feeding areas about to gain a lot more load
- Halogen transformers sitting loose in the ceiling space
- Asbestos-containing materials in older switchboard panels, which changes how the work is handled
None of these are disasters. But they're much better discovered at quote stage than mid-job, which is why an electrician who talks about them upfront is telling you something useful rather than hedging.
Renovating Triggers Current Standards
Here's the part that catches people out on budget. An existing installation is generally allowed to remain as it was installed. New and altered work has to meet current standards.
In practice that means when you renovate a kitchen or bathroom, the circuits serving it need current-standard protection, including RCD protection. Bathrooms additionally have zone requirements governing what fittings can go where relative to the bath and shower, which is why a heat lamp or a light can't simply go wherever it looks best.
Often this is the moment a house finally gets the safety switch protection it should have had for thirty years, which is a good outcome. But it does mean a renovation sometimes triggers a switchboard upgrade, and you want that in the budget from the start rather than as a variation in week three.
If You're the Builder Rather Than the Homeowner
The same points apply, with one addition. The thing that actually determines whether the electrical trade helps or hurts your program isn't the quote, it's whether they turn up on the day they said.
A rough-in that slips three days pushes the plasterer, which pushes the painter, which pushes handover. That cost never appears in the electrical quote but it's far larger than the difference between two quotes. It's worth weighting reliability accordingly.
