Pillar guide
Home Wiring & Renovation
Wiring is the part of a home's electrical system you never see — until a renovation opens the walls or an inspector flags something. This guide explains when rewiring is needed, the older wiring types that worry insurers, what rewiring costs, and the code basics for adding circuits and remodeling kitchens and baths.
Updated 2026-10-15
Repair, partial rewire, or full rewire
Most homes don't need a full rewire. Electricians usually recommend one when the original wiring is knob-and-tube or has deteriorating cloth insulation throughout, when aluminum branch wiring has failing connections, or when a gut renovation makes walls accessible anyway. Otherwise, targeted repairs and new circuits where loads have grown are the norm.
Plan around access
Rewiring cost is driven more by access than by wire. Open framing during a remodel is fast; fishing wire through plaster walls is slow and requires patching. If a renovation is coming, that's the cheapest time to rewire the affected rooms.
- Coordinate rewiring with insulation, drywall, and HVAC work
- Add circuits for future loads while walls are open
- Upgrade boxes to accept smart switches and devices
- Plan panel capacity alongside new circuits
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Frequently asked questions
Can I live in my house during a rewire?
Usually yes. Electricians work room by room and restore power each evening, though expect dust and some days with limited power.
How long does a full rewire take?
A typical single-family home takes one to three weeks of electrical work, plus time for inspections and wall repair.
Do I need permits for rewiring?
Yes. Rewiring requires permits and rough-in inspections before walls are closed.
Related topics
This guide is general information, not engineering or legal advice. Electrical codes are adopted and amended locally — consult a licensed electrician and your local building department for your project.