How do I deal with knob and tube wiring during a renovation?

Knob and tube wiring must be completely replaced during any renovation that involves opening walls or ceilings - it's not just outdated, it's a safety hazard and insurance liability in Ottawa homes.

Understanding Knob and Tube Wiring

Knob and tube was the standard electrical system in Ottawa homes built before 1950, with some installations continuing into the 1960s. This system uses separate hot and neutral wires run through ceramic knobs and tubes, with no ground wire. While it may have worked for decades, it's completely inadequate for modern electrical demands and poses serious safety risks including fire hazards from overloaded circuits, deteriorated insulation, and improper modifications over the years.

Legal and Safety Requirements in Ontario

You cannot legally renovate around knob and tube wiring in Ontario. The Electrical Safety Authority (ESA) requires complete replacement when walls are opened during renovation work. This isn't just a recommendation - it's mandatory for permit approval. Insurance companies are increasingly refusing coverage or charging significant premiums for homes with knob and tube wiring. Some insurers give homeowners 30-60 days notice to replace the system or face policy cancellation.

The Replacement Process

A complete electrical upgrade in an Ottawa home typically costs $8,000 to $15,000 depending on house size and complexity. This includes a new 200-amp service panel, modern wiring throughout, GFCI outlets in bathrooms and kitchens, and proper grounding. The work requires ESA permits and inspections - expect 2-4 weeks for permit processing plus 3-7 days for the actual electrical work. Your licensed electrician will coordinate the ESA inspections and ensure code compliance.

Integration with Renovation Projects

The silver lining is that electrical upgrades integrate well with renovation projects since walls are already being opened. This is actually the most cost-effective time to rewire, as you avoid the expense of opening and repairing finished walls solely for electrical work. Plan the electrical upgrade early in your renovation timeline - it needs to happen before insulation and drywall installation.

Professional Requirements

This is absolutely not DIY work. Only licensed electricians can perform this work in Ontario, and ESA permits are mandatory. Attempting unpermitted electrical work creates serious liability issues and will cause problems when selling your home. A qualified electrician will assess your current system, design the new layout, pull permits, and ensure all work meets current Ontario Electrical Safety Code requirements.

Next Steps

Start by having a licensed electrician assess your current system and provide a detailed quote for replacement. Factor this cost into your renovation budget from the beginning - it's not optional if you're opening walls. For a comprehensive renovation that includes proper electrical upgrades, contact Justyn Rook Contracting for a free consultation where we coordinate all trades including licensed electrical contractors.