Knob and Tube Wiring in BC Homes - What Buyers Should Know Before Removing Subjects
Knob and Tube Wiring
Older homes in Vancouver, Burnaby, New Westminster, Richmond, Delta, Surrey, and the Lower Mainland often come with electrical surprises. One of the biggest is knob and tube wiring.
If a home inspection report mentions knob and tube wiring, do not ignore it and do not remove subjects without understanding what it means for safety, insurance, renovation plans, and budget. Knob and tube wiring is not something to guess about from a few photos. It needs a careful electrical review.
Here is what buyers and homeowners should know.
What Is Knob and Tube Wiring?
Knob and tube wiring is an older wiring method used in many homes built before modern grounded cable became standard. It uses separate conductors supported by ceramic knobs and protected by ceramic tubes where wiring passes through framing.
In many homes, the issue is not simply that knob and tube exists. The concern is the condition of the wiring and what has happened to it over decades of renovations, insulation, splices, fixture changes, overloaded circuits, and DIY work.
Why Buyers Should Take It Seriously
Knob and tube wiring can create problems during a real estate purchase because it may affect:
1. Home insurance approval
2. Mortgage or lender requirements
3. Renovation planning
4. Electrical safety
5. Cost of repairs or rewiring
6. Negotiations before subjects are removed
Many insurers view knob and tube wiring as a higher-risk electrical condition. Some may refuse coverage, some may require replacement, and others may ask for an electrical inspection before issuing or renewing a policy.
If you are buying, confirm the insurance position before you remove subjects. Do not assume coverage will be simple.
Common Problems Found With Knob and Tube
A licensed electrician may look for:
7. Active knob and tube circuits
8. Unprotected or damaged wiring insulation
9. Improper splices into newer wiring
10. Overloaded older circuits
11. No equipment grounding conductor
12. Hidden junctions
13. Wiring buried in insulation
14. Old two-prong outlets
15. Old panels or fuse boxes
16. Signs of heat, arcing, or DIY modifications
Some older wiring may appear to work fine day to day, but still be a poor fit for modern loads, grounded appliances, computers, kitchens, bathrooms, EV chargers, heat pumps, and renovations.
Do Not Rely on a General Home Inspection Alone
A home inspector may identify visible knob and tube wiring, but they usually do not perform a full electrical assessment. A licensed electrician can inspect the panel, accessible wiring, attic, basement, crawlspace, outlets, switches, fixtures, and visible junctions to better understand how much active old wiring remains.
This matters because some homes have partial rewiring. Others still have active knob and tube in key areas. Some have old wiring left abandoned in place but disconnected. The difference affects scope, cost, and insurance.
Questions to Ask Before Removing Subjects
Before you remove subjects on an older home, ask:
17. Is any knob and tube wiring active?
18. Has the electrical system been partially rewired?
19. Are permits available for past electrical work?
20. Does the insurance company require replacement or inspection?
21. Does the panel have enough capacity for future upgrades?
22. Will renovation walls or ceilings need to be opened?
23. Are there old fuse panels, 60A service, aluminum wiring, or Federal Pioneer panels as well?
The answers can change the real cost of the home.
Serving the Lower Mainland Since 2007
Hundel Electric provides older-home electrical inspections, knob and tube reviews, full home rewiring, panel upgrades, service upgrades, and renovation wiring across Delta, Surrey, Burnaby, Richmond, Vancouver, Langley, Coquitlam, New Westminster, and nearby Lower Mainland communities.
If you are buying an older home and the inspection mentions knob and tube wiring, call or text Hundel Electric at 604-358-5549 before removing subjects.