What Does a Residential Electrical Installation Include From Start to Finish?
The Question Nobody Asks Until It's Too Late
Here's an honest truth: most homeowners in Nelson Tasman only think about their electrical system when something stops working. A power point stops charging your phone. A light flickers for no reason. Or worse, you're standing in a half-renovated kitchen wondering why nobody warned you that wiring takes longer than fitting the cabinets.
You're not alone in this. Electrical work happens behind walls, under floors and inside ceiling cavities, which means it's one of the most misunderstood parts of any build or renovation. You trust that it's being done properly, but you rarely see what "properly" actually looks like.
A full residential electrical installation moves through seven stages: consultation and site assessment, design and planning, council documentation, first fix (rough-in), second fix (fittings), testing and certification, and final handover. A licensed electrician like Mako Electrical manages every stage, and by law, your installation must be tested and certified before it's safe to use. The whole process, from quote to keys-in-hand, typically takes anywhere from a few days for smaller jobs to several weeks for a full rewire.
Key Takeaways
A residential electrical installation follows seven stages: consultation, design, compliance paperwork, first fix, second fix, testing, and handover
First fix happens before walls are lined; second fix happens after
Testing against AS/NZS 3000 is required before any installation is considered safe to use
You should always receive an Electrical Safety Certificate, and a Certificate of Compliance for larger jobs
Skipping steps or hiring unlicensed workers puts your safety and home value at risk
Full rewires and larger projects take several weeks; smaller jobs can be completed in days
What a Residential Electrical Installation Actually Means
A residential electrical installation is the complete process of designing, fitting and certifying the wiring, switchboards, power points, lighting and safety systems inside your home. It's not just "running some cables." It covers everything from the moment power enters your property to the last light switch you flick before bed.
Whether you're building new, doing a full house rewire, or upgrading a kitchen or bathroom, the underlying process stays largely the same. What changes is the scale. A new power point installation might only need two of these steps. A full rewire needs all seven, done in order, with nothing skipped.
Understanding this process matters because it helps you know what you're paying for, what questions to ask, and what "done properly" should actually look like when the job is finished.
Step One: Consultation and Site Assessment
Every installation starts with a conversation, not a quote form. A qualified electrician visits your property, or discusses your plans over the phone, to understand what you actually need. They'll ask about your household, your appliances, any renovation plans, and how you use each room day to day.
During the site visit, the electrician checks your existing switchboard, wiring age, and overall capacity. Older Nelson homes, particularly those built before the 1990s, often have wiring that wasn't designed for modern loads like heat pumps, induction hobs or spa pools. This assessment is where problems get caught early, long before they become expensive surprises halfway through a build.
This stage also covers your budget and timeline honestly. A good electrician tells you what's essential versus what's optional, rather than upselling work you don't need.
Step Two: Electrical Design and Planning
Once your needs are understood, the design phase begins. This is where the electrician maps out circuit layouts, decides where power points and switches will sit, and calculates the load your switchboard needs to handle safely.
Good design thinks ahead. It considers where you'll want extra power points in five years, not just where they're convenient today. It also accounts for New Zealand's electrical standards, including AS/NZS 3000, which sets the rules for how residential wiring must be installed to keep your home safe.
For larger projects, this stage produces a written plan and materials list, so you know exactly what's being installed and why. It removes the guesswork and gives you something concrete to approve before any cable is touched.
Step Three: Compliance Paperwork and Council Requirements
This is the stage most homeowners never see, yet it's one of the most important. Depending on the scope of work, your project may need a building consent, and it will almost always require an Electrical Certificate of Compliance (CoC) once finished.
Your electrician handles the paperwork side, including notifying the relevant authority and arranging any required inspections. Skipping this step isn't just risky, it's illegal for anything beyond very minor work, and it can cause real problems if you ever sell your home. Buyers' lawyers routinely ask for compliance certificates, and missing paperwork can hold up a sale.
Step Four: First Fix — The Rough-In Stage
Now the physical work begins. First fix, often called the rough-in stage, is when cables are run through walls, floors and ceiling cavities before any plastering, insulation or wall linings go up. This is the electrician's one real chance to route wiring cleanly, so it matters that it's done right the first time.
During this stage, the switchboard location is confirmed, cable runs are secured, and boxes for power points, switches and lighting are fitted into position. If you're doing a renovation rather than a new build, this step often involves careful work around existing structures, which is why renovation electrical work usually takes longer than a straightforward new build.
Step Five: Second Fix — Fittings and Finishing
Once walls are lined and painted, the electrician returns for second fix. This is when the visible parts of your installation go in: power points, light switches, downlights, the switchboard itself, and any smart home or specialist fittings like decorative power points.
Second fix is where a home starts to feel finished. It's also where attention to detail really shows, from level switch plates to properly labelled circuits in your switchboard. If you've asked for specific additions like outdoor power sockets or provisions for a spa pool, this is when they're connected and made functional.
Step Six: Testing and Certification
Nothing gets switched on and left "as is." Before any installation is signed off, it must be tested against AS/NZS 3000 standards. This includes checking insulation resistance, earth continuity, polarity and RCD (safety switch) function across every circuit.
Testing isn't a formality, it's what actually confirms your home is safe to live in. Once testing is complete, your electrician issues an Electrical Safety Certificate, and for larger jobs, the Certificate of Compliance is lodged. These documents are yours to keep, and you should store them somewhere safe alongside your other property paperwork.
Step Seven: Handover and Aftercare
The final stage is handover. Your electrician walks you through the completed work, explains your switchboard layout, and answers any questions about how your new system operates. You'll receive copies of all certificates, warranty information, and a run-down of anything you should know for future maintenance.
A proper handover also includes honest advice about upkeep. For example, knowing when to book winter electrical safety checks can help you catch small issues before they turn into an emergency callout.
Why the Full Process Matters to You
Skipping steps, or hiring someone who doesn't follow this sequence properly, is where most electrical problems start. A rushed first fix leads to messy second fix work. Missed testing leads to safety risks you can't see. Missing paperwork leads to headaches when you try to sell your home.
Following the complete process protects three things that matter most: your family's safety, your home's value, and your peace of mind. It also means fewer surprises, clearer costs, and a finished result that actually works the way it was designed to.
Key Benefits of Following the Full Installation Process
Safety you can trust — every circuit tested against national standards before use
Legal compliance — certificates that protect you at resale and during insurance claims
Fewer future problems — clean first fix work reduces faults down the line
Clear costs — a proper design stage means fewer surprise expenses mid-project
Long-term value — a well-documented, correctly wired home is easier to sell
Ready to Start Your Electrical Installation the Right Way?
If you're planning a new build, a renovation, or simply want your home's wiring assessed properly, the process doesn't need to feel confusing. A licensed Mako Electrical electrician can walk you through every stage above, tailored to your property and your budget, with nothing skipped and nothing rushed.
Get in touch with Mako Electrical today for a straightforward consultation, or explore our residential electrical services in Nelson to see how we can help with your next project.
Bringing It All Together
Knowing what happens during a residential electrical installation takes the mystery out of the process. From that first site visit to the moment your electrician hands you a signed safety certificate, every stage exists to protect your home and the people living in it. When you understand what "properly done" looks like, you're better placed to ask the right questions and choose an electrician who won't cut corners.
If your home's wiring hasn't been assessed in a while, or you're planning work that touches your electrical system, Mako Electrical is here to guide you through it, step by step.
Frequently Asked Questions
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A full house rewire typically takes one to three weeks depending on the size of your home, while smaller jobs like adding power points can be completed in a single day. Older homes with limited access under floors or in ceilings may take longer, as electricians need extra time to run cables safely and neatly through existing structures.
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Not always. Minor work like replacing a power point usually doesn't need consent, but larger projects such as full rewires or switchboard upgrades often do. Your electrician will confirm what's required for your specific job and handle the paperwork with your local council on your behalf.
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First fix is the rough-in stage, where cables are run through walls and floors before linings go up. Second fix happens after painting, when visible fittings like power points, switches and light fixtures are installed and connected to make everything functional.
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Costs vary widely depending on scope, from a few hundred dollars for a single power point to tens of thousands for a full rewire. The clearest way to get an accurate figure is a site visit and written quote, since every home's wiring condition and layout differs.
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Not quite. An Electrical Safety Certificate confirms the work was tested and is safe to use, while a Certificate of Compliance is a broader document confirming the installation meets New Zealand's electrical safety regulations. Larger jobs typically need both.
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Very limited tasks, like replacing a light bulb, are fine. Almost everything else, including wiring, switchboard work and power point installation, legally requires a licensed electrician. Unlicensed work can void insurance and create serious safety risks.
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If testing identifies a fault, your electrician will explain exactly what needs fixing before certification can be issued. This might mean replacing damaged cable, correcting a wiring error, or upgrading an outdated component. The installation isn't signed off until it passes.
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Signs include flickering lights, warm switch plates, fuses that trip often, or wiring insulation that looks cracked or brittle. If your home was built before the 1990s and hasn't been rewired, it's worth booking an assessment to check whether your system can handle modern appliance loads.
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Yes, a properly certified, up-to-date electrical system is a genuine selling point. It reassures buyers and their lawyers that there are no hidden compliance issues, and it can prevent price negotiations that often happen when old wiring is discovered during a pre-sale inspection.
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Ask whether they're a licensed practising electrician, whether they'll provide written certification, and what their process looks like from quote to handover. A trustworthy electrician will explain each stage clearly, similar to the process outlined in this guide.
