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Question DetailsAsked on 10/20/2017

approx.cost to cut 3 outlets w/knob & tube and replace w/updated outlets

house built in 1920,all kit/bath/attic have had knob and tube cut and removed.Have approx.3-4 knob and tube outlets that need to be changed to grounded updated outlets

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1 Answer


Depends almost entirely on how many circuits have to be run (are these all on one circuit, or several ?) and on accessibility - if ceilings/walls have to be cut into to run the wires then the repair and repainting can sometimes run as much as the electrician cost.

How the knob and tube wire is hooked in makes a BIG difference too - some was connected at each knob and knotted at tubeends so you cannot pull it out - other was installed in insulators/tubes with adequate clearance to allow it to be pulled out, pulling the new wiring behind it,, which can eliminate a lot of cutting into walls if that is the case. Of course, in most cases it was installed in basement and attic open space, so generally following that old routing with new wiring is fairly easy - but not always.

With easy access - through attic or crawlspace with about 3 foot headroom or through basement with bare overhead floor joists, you might get it for about $200-400 per circuit plus additional $50 or so per outlet - with difficult access or having to cut into walls and/or ceilings to do it, might run twice that - or even more in concrete, stone, or brick construction house at times.

You did not say anything about light fixtures - do you have lighting circuits also still on knob and tube wiring ?

Electrical is of course the Search the List category to find well-rated and reviewed contractors for this work.

Answered 2 years ago by LCD

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