Knob and tube wiring was standard in homes built before the 1950s, and many Guelph's older neighbourhoods still have it. It's not inherently dangerous, but it creates real problems.
Insurance Issues
Most Ontario insurers won't cover homes with active knob and tube wiring, or charge significant premiums. Many Guelph homeowners discover this at renewal.
The Fix
Full replacement with modern wiring, ESA-permitted and inspected. Cost depends on home size but typically runs $8,000–$20,000 for a full rewire.