Knob-and-Tube Wiring Replacement
Knob-and-tube wiring is an old wiring method found in some older houses. It uses ceramic knobs and tubes to hold wires in place, without the protective sheathing found in modern cables. Knob-and-tube wiring replacement updates this outdated system with safer, modern wiring.
Why This Service Matters
Knob-and-tube wiring was common many years ago, but it does not meet today's safety standards. It has no earthing, cannot safely handle the power demands of modern appliances, and its insulation becomes brittle with age. Knob-and-tube wiring replacement removes this outdated system and replaces it with insulated, earthed cables that can handle current electrical loads safely.
What to Expect During the Service
- Wiring Identification – The electrician locates all knob-and-tube wiring in the house, including sections hidden in the ceiling or walls.
- Planning the New Layout – A new wiring plan is drawn up to match modern safety standards and the home's power needs.
- Power Isolation – Power is switched off before any old wiring is removed.
- Removal of Old Wiring – Knob-and-tube wires, knobs, and tubes are carefully removed.
- Installation of New Wiring – Modern insulated and earthed cables are installed in their place.
- Testing and Certification – The new wiring is tested fully before the electrician signs off on the work.
Because knob-and-tube wiring replacement often involves opening walls or ceilings, a good provider will explain the extent of the work needed before starting, including any repairs to walls afterward.
Why Insurance Providers Often Ask for This
Some insurance providers see knob-and-tube wiring as a risk and may require it to be replaced before offering full cover on a home. This makes replacement useful for both safety and insurance purposes.
Estimated Cost of Knob-and-Tube Wiring Replacement
| Service | Estimated Cost (KES) |
|---|---|
| Wiring assessment and mapping | 3,000 – 8,000 |
| Replacement per room | 15,000 – 30,000 |
| Full house replacement (small home) | 80,000 – 150,000 |
| Full house replacement (large home) | 150,000 – 300,000+ |
| Wall or ceiling repair after rewiring | 10,000 – 30,000 |
| Final testing and certification | 5,000 – 12,000 |
Costs depend heavily on house size and how much of the structure needs to be opened.
Final Thoughts
Knob-and-tube wiring replacement is a significant but worthwhile upgrade for older homes. It brings the electrical system up to modern safety standards and gives you a wiring system that can handle today's appliances and power demands.