How to Replace Old Knob and Tube Wiring

How to Replace Old Knob and Tube Wiring


Replacing old knob and tube wiring in your home can seem like a daunting task, but with proper planning and by following safety precautions, it is quite doable as a DIY project. Knob and tube wiring was commonly installed in homes built before the 1940s. While it can still be functional, it presents safety hazards due to lack of grounding, insulation, and capacity for electricity needs in modern homes. Replacing it completely should provide peace of mind and allow for easier upgrades.

Reasons to Replace Knob and Tube Wiring

There are several important reasons why I should replace old knob and tube wiring in my home:

Preparing for the Replacement Project

Before beginning the wiring replacement project, I need to make sure I complete certain preparations:

Gather Supplies and Tools Needed

Take Safety Precautions

Create a Plan and Get Permits

Step-by-Step Knob and Tube Replacement Process

Here is an overview of the typical end-to-end process I will need to follow:

1. Turn Off Power and Disconnect Old Wiring

2. Install New Wiring Pathways

3. Connect the New Wiring to Circuits

4. Connect New Wiring to Outlets and Fixtures

5. Update Electrical Boxes and Fixtures

6. Close Up and Patch Finished Areas

7. Turn Power Back On and Test

Hiring a Professional Electrician

While a DIY replacement of knob and tube wiring is possible in many cases, some homeowners opt to hire a professional electrician to take care of the project. Here are some benefits of hiring a pro:

While a professional wiring replacement costs more upfront, it provides peace of mind knowing the job was done safely and correctly by a licensed electrician. I should get quotes from at least 3 local electricians and check reviews before choosing one.


Replacing outdated and potentially hazardous knob and tube wiring provides significant safety and functionality benefits for my home. By carefully planning the project, taking safety precautions, following local electrical codes, and getting help from an electrician if needed, I can successfully upgrade my home's electrical system and gain peace of mind. While somewhat tedious, replacing the old wiring is a valuable investment in my home's safety and modernization.