Lifespan by Wire Type
- Modern PVC-insulated copper romex (1970s–today): 50–70 years, likely longer
- Cloth-insulated copper (1930s–1950s): 40–50 years, most now past safe life
- Aluminum branch (1965–1975): functional lifetime unlimited, but connection points degrade continuously
- Knob-and-tube (1900–1940): rubber insulation typically fails by 60–80 years
Visible Warning Signs
- Insulation that flakes when a wire is flexed
- Discoloration around outlets and switches
- Fabric-covered wires visible in the attic
- Two-prong outlets throughout the home
- Warm outlet or switch plates
- Frequent bulb burnouts on the same fixture
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When to Consider a Rewire
If your home is over 60 years old, has any of the warning signs above, or your insurance carrier is asking questions, book an electrical inspection. A thorough inspection ($200–$400) tells you which circuits are healthy and which need work — you rarely need a full rewire all at once.
Frequently Asked Questions
Can I just have the panel inspected?+
That's a good start, but the panel doesn't tell you what's inside the walls. A proper inspection includes attic access, sampling of outlets and switches, and load testing.