Rewiring an entire house is the sort of refurbishment that often raises a lot of questions about cost, timescales and safety. Unlike repainting or replacing flooring, the cabling is hidden away, which can make it harder to see where the money is going-even though the work follows clear technical criteria and can be planned with a reasonable level of predictability.
How much does it cost to rewire a house?
The price of a full electrical rewire depends on the floor area, the number of rooms, how many lighting points and sockets are needed, and the quality level of the materials. In many Brazilian cities, it is common to agree a blend of pricing per square metre alongside a price per electrical point, with the final figure adjusted to match what the project requires.
Lighting usually accounts for a smaller share of the budget. By contrast, sockets intended for high-power appliances, air conditioning, showers and heaters tend to push up the overall cost. Older properties often need additional corrective work-such as replacing the distribution board and chasing into walls-which increases both labour and the time on site.
Watch a video on the YouTube channel Mundo da Elétrica about planning a residential electrical refurbishment, material costs and why it matters to hire qualified professionals:
https://www.youtube.com/watch?v=y3n9E94oI1M
Which factors have the biggest impact on the cost of an electrical rewire?
When you choose to redo the electrical installation, certain elements affect the budget directly-especially if the aim is to ready the home for modern equipment and possible future extensions. Beyond material quantities, the total also reflects planning, testing and any structural adjustments that may be needed within the property.
Among the items that most often change the final price, pay close attention to:
- House size: a larger area calls for more cables, conduit and fittings.
- Number of circuits: adding circuits improves safety, but means more breakers and more labour time.
- Material specification: well-known brands and devices such as DR and DPS increase the cost, but provide greater protection.
- Condition of the existing installation: very outdated systems typically require more masonry repairs and compliance-related changes.
- Ease of access: concrete slabs and older pipework can make the job slower and more complex.
Why is it important to hire a qualified professional for electrical work?
Electrical refurbishments involve load calculations, correct cable sizing, selecting breakers and choosing protective devices against electric shock and surges. A mistake can lead to excessive overheating, frequent power trips and serious accident risks. For that reason, it is vital to follow technical standards such as NBR 5410 and the requirements of the local electricity provider.
With a properly qualified professional, the resident gets circuits sized appropriately, a layout of lighting points and sockets that matches real usage in each space, and the foresight to include independent circuits for showers and air conditioning. Circuit diagrams or written records also make future maintenance simpler and help faults be located quickly.
What signs show it is time to rewire the house?
Before authorising a full overhaul, it is worth confirming whether replacing the wiring is genuinely necessary. Some warning signs indicate that the electrical system no longer matches today’s demand-or that it may be putting residents at risk.
Breakers tripping repeatedly, warm sockets, a burning smell, installations that have gone decades without updates, and heavy reliance on extension leads are all alerts that should be taken seriously straight away. In many situations, a complete rewire is more effective than isolated fixes, and it can be scheduled alongside other improvements-such as changing finishes and repainting-to reduce unnecessary demolition and rework.
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