How to Safely Rewire Your Home with Obsolete Knob and Tube Wiring


Rewiring a home with obsolete knob and tube wiring can seem daunting, but it is possible to do safely if you take the proper precautions. Knob and tube wiring was common in homes built before the 1940s, but it can present fire and shock hazards if left in place. In this guide, I will walk through the key steps I took to rewire my 1920s home, focusing on safety and avoiding common pitfalls.

Dangers of Knob and Tube Wiring

Before rewiring, it's important to understand why knob and tube wiring is problematic:


Thorough preparation is crucial for a smooth and safe rewiring project. Here are the key steps I took:

Rewiring Tips

When you're ready to start rewiring, follow these tips to maximize safety:

Final Safety Checks

Before turning the power back on, conduct these final safety checks:

Only restore power once you've confirmed through close visual inspection and testing that everything is safe and ready for service.


While rewiring a home with knob and tube wiring has its hazards, taking proper safety precautions at every step allows the project to be completed safely. Following the tips outlined here for thorough preparation, careful execution, and double-checking your work can help avoid fires, shocks or other dangerous mishaps. With adequate care and caution, that obsolete wiring can be updated to modern standards.