| Is it mandatory to replace if it is working? |
| No, leave it alone. |
| Yes, it’s a hazard. Also, if you buy a house with it you will have to rewire to be insurable. |
But if someone is living in the house now aren’t they insured? |
If they don't have a mortgage they may not be. |
| I've never had knob and tube, but I did have a fuse box and my insurance company said I had to replace it with circuit breakers or they'd cancel me. Cost about $1500 if I recall. |
| I’ve never heard of a mortgage or home insurance company requiring this. I have relatives all over the northeast with knob and tube. We have aluminum wiring which I think is worse frankly but have not been required to replace it (although we did mitigate it with purple fasteners to sleep easier.) |
Did they buy recently? We bought a house with knob and tube and had to rewire for insurance. But it’s also just a really good idea to rewire. Knob and tube is not meant to handle the electrical needs of a modern house. You also have to have those three prong adapters everywhere. |
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Legally, it is grandfathered in most localities, unless/until one renovates/modifies the house. Localities do vary about this.
Insurance companies generally will require replacement if they know about it. It might be a carve-out in the policy also, read the policy carefully. It IS an actual hazard - can start a house fire, so it is wise to replace. It is easier to replace in a vacant house, of course. |