How do I check if my house has knob and tube wiring before starting a renovation in New Brunswick?

Knob and tube wiring is definitely something you need to identify before starting any renovation — this obsolete wiring system was common in New Brunswick homes built between 1880 and 1950, and it's still found in many older properties across Moncton, Saint John, Fredericton, and smaller communities throughout the province.

Visual inspection is your first step. Head to your basement, attic, or any exposed areas and look for ceramic knobs (white or brown porcelain insulators) mounted to joists and studs, with individual black and white wires running between them. The wires are separated by about 6 inches and supported by these distinctive ceramic components. You might also see ceramic tubes where wires pass through wooden structural members. Unlike modern cable, knob and tube uses completely separate hot and neutral wires.

Check your electrical panel as well — homes with knob and tube often have old fuse boxes with screw-in fuses rather than modern circuit breakers. However, some homeowners have upgraded the panel while leaving the old wiring in place, so don't assume modern breakers mean modern wiring throughout.

In New Brunswick, any electrical work requires a licensed electrical contractor and permits from NB Power (1-800-615-0522). If you discover knob and tube wiring, you cannot legally work around it yourself — this falls under the Technical Inspection Services (TIS) regulations for electrical safety. A licensed electrician can properly assess the system and determine what needs upgrading.

Insurance implications are significant. Many insurance companies in New Brunswick either refuse coverage or charge substantial premiums for homes with active knob and tube wiring. Even if your current insurer covers it, they may require full replacement before renewing your policy. Get this sorted before your renovation creates access issues.

Renovation timing is crucial because once you open walls, any knob and tube wiring in those areas typically needs to be brought up to current National Building Code standards. This isn't just about the wiring itself — you'll need proper grounding, GFCI protection in bathrooms and kitchens, and adequate circuits for modern electrical loads. Budget $8,000-$15,000 for a full electrical upgrade in a typical New Brunswick home.

Your next step should be hiring a licensed electrical contractor for a comprehensive assessment. They can determine exactly what wiring exists, what needs immediate attention, and how to phase the electrical work with your renovation plans. Contact TIS at 1-888-659-3222 if you have questions about electrical licensing requirements.

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