Building a new home or managing your own build as an owner-builder means juggling a long list of trades, and electrical work is one of the few that touches almost every other stage of the project. Get the timing wrong and you're chasing conduit into finished plasterboard; get the compliance paperwork wrong and you can't legally connect the property. Understanding how new house wiring actually unfolds — and what decisions need to be locked in before the frame is sheeted — saves real money and real delays.
We're Voltas Electrical & Airconditioning, a licensed Adelaide electrical team (licences BLD 274739 · PGE 265145 · AU 61210) that works directly with builders and owner-builders across Adelaide metro on new house wiring, from the first rough-in through to switchboard commissioning and final fit-off. Same-day appointments are the norm when a build schedule shifts, and we're available 24/7 for anything urgent once a property is occupied.
The Three Stages of New House Wiring
Most residential electrical work on a new build happens in three distinct visits, each tied to a specific point in the builder's construction sequence:
- Rough-in — cabling, conduit, and the switchboard's physical position are run through the wall, ceiling, and floor cavities while the frame is still open and before insulation and plasterboard go in. This is the stage where every circuit's location gets locked in, so it's the most important one to get right the first time.
- Switchboard installation — the switchboard enclosure, main switch, circuit breakers, and safety switches (RCDs) are fitted and connected, sized to the number of circuits the home actually needs (and ideally with room to spare — more on that below).
- Final fit-off — after painting is complete, the electrician returns to install switches, power points, light fittings, and exhaust fans, then tests and commissions the whole installation before it's connected and handed over.
Rough-in happens before linings go up
Once plasterboard is sheeted, adding or moving a circuit means cutting into finished walls.
Switchboard sizing is a one-time decision
An undersized board is a common reason a near-new home needs an upgrade within a few years.
Fit-off is also the compliance checkpoint
Testing and the eCoC lodgement both happen at this final stage, not earlier.
Owner-builders carry the coordination risk
Without a head contractor managing trade sequencing, the timing responsibility falls on you.
Why Timing Coordination with the Builder Actually Matters
An electrician can't rough-in a circuit into a wall cavity that's already closed up, and a builder can't sheet plasterboard over a wall the electrician hasn't finished with yet. On a standard project-builder job this sequencing is usually handled by the builder's site supervisor as part of the overall trade schedule. On an owner-builder job, that coordination responsibility sits with you — which means confirming rough-in is genuinely complete, and any last-minute changes (an extra power point, a repositioned light) are locked in, before you give the green light to close up walls and ceilings.
This is also the point in the build where changes are cheapest to make. Adding a data point, relocating a switch, or adding an extra circuit during rough-in is a straightforward variation. The same change requested after fit-off, or worse, after the home is occupied, usually means cutting into a finished wall, patching, and repainting — for a job that would have taken minutes during rough-in.
Coordinating a new build or owner-builder project and need an electrician who works to your builder's schedule?
Get a Same-Day QuoteCompliance: The Certificate of Compliance (eCoC) and AS/NZS 3000
Every new house wiring job in South Australia has to be carried out to AS/NZS 3000, the Australian and New Zealand Wiring Rules that set out the technical standard for how electrical installations are designed and installed. It's the reference standard SA's electrical safety framework is built around, covering everything from circuit protection to cable sizing and switchboard layout.
Once the electrical work is finished, the licensed electrician who carried it out must lodge a Certificate of Compliance, known in SA as an eCoC (electronic Certificate of Compliance), through the Office of the Technical Regulator's online system. The eCoC is the formal record confirming the installation meets AS/NZS 3000 and SA's electrical safety requirements, and it's required before a new home's electrical installation is considered compliant and ready for connection. If you're managing your own build, it's worth explicitly confirming with your electrician that the eCoC has been lodged as part of handover — it's a step that's easy to assume happened automatically when in fact it needs to be actioned.
What's Worth Wiring In Now, Not Retrofitting Later
Some additions are dramatically cheaper to include during rough-in and switchboard installation than to add once the home is finished and occupied. A few worth raising with your electrician before walls close up:
- An EV charger circuit. Running a dedicated circuit and conduit from the switchboard to the garage or carport during rough-in is a simple addition. Retrofitting the same circuit later usually means chasing into finished walls or running exposed conduit around the outside of the house — a much bigger, messier, and more expensive job for an identical result. The National Construction Code has, at various points, considered mandating EV-charging provisioning in new homes, but as of 2026 those residential provisions have been put on hold by Australia's building ministers rather than taking effect — so there's currently no blanket requirement in South Australia, which makes it a genuine planning decision rather than an automatic inclusion.
- A solar-ready switchboard. Whether or not solar is going on the roof at handover, asking for a switchboard with a few genuine spare circuit ways and enclosure space costs little at installation but avoids a full board replacement later, since a fully populated board with no room left is one of the most common reasons an otherwise-new switchboard needs upgrading within a few years of a solar or battery installation.
- Extra data and power points. A home office, a media wall, or a second modem/router location are all far easier to wire in while cavities are open than to add after painting is complete.
If solar is genuinely on the near-term plan rather than just a "maybe," it's worth reading our guide on getting a switchboard solar-and-battery ready, which covers South Australia's Flexible Exports rules for new solar inverters in more depth. And if an EV is on the horizon, our dedicated EV charger installation guide covers circuit sizing and Adelaide costs for that job specifically.
Rewiring an Older Home Instead of Building New?
Not every project is a from-scratch build — plenty of Adelaide renovations effectively need a full rewire of an existing home, particularly older housing stock in established suburbs like Prospect and Unley where the original wiring and switchboard predate current standards entirely. If that's closer to your situation, our guide on signs your home needs a full rewire covers the warning signs and process for that scenario specifically, and our switchboard and electrical upgrades service covers bringing an existing board up to current capacity.
Choosing an Electrician for a New Build or Owner-Builder Project
New house wiring is prescribed electrical work under SA law, meaning it has to be carried out by a properly licensed electrician who can lodge the eCoC on completion — it isn't work an owner-builder can legally do themselves, even on their own property. Beyond the licence itself, look for an electrician used to working within a builder's construction schedule, since new-build timing is genuinely different from a straightforward repair job: rough-in has to happen on the frame stage's timeline, and fit-off has to slot in after painting, not whenever it's convenient. Our team works across Adelaide's full range of electrical and air conditioning services, and we quote new-build electrical work as a staged job — rough-in, switchboard, and fit-off — so builders and owner-builders know exactly what's happening at each site visit.
Frequently Asked Questions
What are the main stages of electrical work in a new house build?
New house wiring generally happens in three stages: rough-in (cabling, conduit and switchboard positioning run through the frame before insulation and plasterboard go in), switchboard installation and connection, and final fit-off (switches, power points, light fittings and the switchboard itself are completed, tested and commissioned after painting). Each stage needs to happen at the right point in the build sequence, and the electrician's timing has to line up closely with the builder's program.
What is an eCoC and do I need one for a new house build in South Australia?
An eCoC (electronic Certificate of Compliance) is South Australia's mandatory record confirming that electrical work meets the required safety standards. It must be lodged by the licensed electrician who did the work through the Office of the Technical Regulator's online eCoC system, and a new house build needs one covering the completed electrical installation before it can be safely connected and occupied. Builders and owner-builders should confirm their electrician has lodged the eCoC as part of handover, not assume it happens automatically.
Is it cheaper to wire in an EV charger circuit during construction than to add one later?
Yes, in almost every case. Running a dedicated circuit and conduit from the switchboard to the garage or carport during rough-in, while the wall cavities are still open, is a straightforward job. Adding the same circuit after the home is built and finished usually means chasing into finished walls, patching, repainting, and sometimes rerouting around obstructions, which adds significant labour and disruption cost for the same electrical outcome.
What should a builder or owner-builder plan for at the switchboard stage?
Beyond meeting today's circuit requirements, it's worth asking your electrician to leave genuine spare circuit ways and physical space in the switchboard enclosure for things you're likely to add later, such as solar, a battery, or an EV charger. A board installed with no spare capacity almost always needs replacing, not just added to, when one of those additions comes along, which is a considerably more expensive job than provisioning for it up front.
Planning a New Build or Owner-Builder Project?
Talk to us early about rough-in, switchboard sizing, and fit-off timing so your electrical work lines up with the rest of your build.
Sources referenced: AS/NZS 3000 (Australian/New Zealand Wiring Rules), energymining.sa.gov.au (Office of the Technical Regulator, eCoC requirements), and current National Construction Code guidance on EV-charging provisioning for new homes.