KC Home Rewiring replaces knob-and-tube wiring in older Kansas City homes with grounded copper circuits — the whole house, or only the circuits that are still live. New cable is fished through plaster and drywall with as few openings as the house allows. The work is permitted and inspected by the applicable local authority, with an itemized scope agreed before installation begins. Electrical work is performed by our installation partner.
Is knob-and-tube replacement the right job for your house?
Replacement may be appropriate where knob-and-tube remains energized, particularly where an electrician finds deteriorated insulation, unsafe alterations or insulation surrounding the conductors. If the only remaining wire is abandoned, an electrician can document that before you plan a rewire. The age of the house doesn’t settle it; tracing circuits at the panel does.
You’ll also see this job called knob-and-tube removal or knob-and-tube rewiring. It’s the same work: new circuits installed, old ones taken out of service, the accessible dead wire removed. Knob-and-tube itself is the wiring method used in American houses from roughly the 1880s into the 1940s — two separate conductors on porcelain knobs, with no equipment ground anywhere in the system. (InterNACHI; ASHI Reporter) One in five housing units in both Kansas City, Missouri and Kansas City, Kansas predates 1940, which is where most of this work is (U.S. Census Bureau, ACS 2020–2024, Table B25034). If you want to identify what’s in your walls first, the complete guide shows how.
What “replacement” means — and what it doesn’t
A complete knob-and-tube replacement scope takes every identified energized knob-and-tube circuit out of service and replaces it with new grounded wiring. A partial or phased scope must identify what remains energized until later work. It does not automatically mean a new electrical panel, a new utility service, or tearing out every dead wire in the attic. Those are separate decisions, and a good estimate names each one.
| Piece of the job | What it is | Included in “knob-and-tube replacement”? |
|---|---|---|
| Branch-circuit replacement | New cable from the panel to every outlet, switch and fixture that was on knob-and-tube (a branch circuit is one run from the panel to a group of outlets) | Yes — this is the job |
| Devices and boxes | Identify replacements and any suitable existing components retained; required grounding and protective devices | Specify the component list in the estimate |
| Arc-fault (AFCI) protection | Protection that detects arcing faults; application depends on circuit and adopted code | Identify required protection for the circuits being installed or altered |
| Panel replacement | New breaker panel in the same location, same service size | Only if the existing panel can’t take the new circuits, or it’s a fuse box or a known-problem brand. Priced as a line item |
| Service upgrade | New meter base, service-entrance conductors (the wires from the utility to the panel), mast and main disconnect — usually to 200 amps — coordinated with the utility | Only if the house needs it. Not every rewire does. Priced separately |
| Removing abandoned knob-and-tube | Pulling out dead wire disconnected years ago | Usually the accessible pieces, so the next inspector doesn’t have to guess. Confirm it in the scope |
| Wall and ceiling repair | Patching the access holes, then texture and paint | Varies by contractor — see below |
For the partial-versus-whole decision, read Partial vs. whole-house rewiring. For what a panel or service upgrade involves, see whole-house rewiring.
How much of the house needs rewiring?
The extent comes from tracing circuits at the panel and inspecting accessible boxes. Some houses need a few original circuits replaced; others need a much broader scope.
What the evaluation should establish:
- Which circuits are still on knob-and-tube. Many Kansas City houses were partially rewired between the 1950s and 1990s. It’s common for the kitchen and bath to be on newer cable while second-floor lighting is still original. The dead knob-and-tube you can see in the basement may be exactly that: dead.
- Splices and extensions. Knob-and-tube with modern cable taped onto it in an open splice, or feeding a bathroom fan, a window air conditioner or a space heater, gets priority. Tape-only splices and knob-and-tube-to-cable joints are among the defects inspectors routinely flag. (ASHI Reporter)
- Insulation contact. The National Electrical Code (NEC 394.12(5)) does not permit knob-and-tube in hollow walls, ceilings and attics “where such spaces are insulated by loose, rolled, or foamed-in-place insulating material that envelops the conductors.” Insulation around energized knob-and-tube is a condition to have evaluated promptly. (NEC 394.12(5), as reproduced by InterNACHI) The scope should address affected attic circuits before adding or disturbing insulation.
- The panel. Fuse boxes with oversized fuses, and panels with no room for new circuits, change the scope.
A room-by-room scope is a legitimate way to phase the work and the cost.
What happens to plaster walls, ceilings and finished rooms?
Most of the new cable is fished through the existing wall and ceiling cavities from the basement and attic. Access holes are still needed — typically a few per room — at outlet and switch locations and wherever a run has to pass blocking inside the wall. A rewire does not mean opening every wall.
In a typical Kansas City story-and-a-half or two-story house with an unfinished basement and an accessible attic, first-floor outlets are fed from below and second-floor lighting from above, with holes concentrated at box locations, behind baseboards and in closets where possible. Plaster is cut with tools that don’t vibrate the lath loose, and the holes are sized to the box or to a patchable opening.
Two things to settle in writing before work starts:
- Who patches, and to what standard. Some electrical contractors patch to a rough, paint-ready state; some leave the holes for a plaster or drywall sub; some include nothing. All three are normal. None is acceptable as a surprise.
- Which rooms are off-limits. A finished basement ceiling, a recently painted dining room or an original decorative plaster ceiling changes the routing plan. Say so up front.
Ask for the wall-repair arrangement in writing so you can compare bids on the same terms.
Where the holes usually go, lead-paint rules for pre-1978 houses, and a room-prep checklist: Rewiring finished walls.
Can you stay in the house during the work?
It depends on access, safe separation from the work area and which essential circuits remain usable. Agree an occupied-house plan and outage schedule with the contractor; nightly power restoration is not automatic. What that looks like day to day, and why some families choose to be out for the heaviest days, is in the plaster and drywall guide.
Permits and inspections
Knob-and-tube replacement is permitted work in every Kansas City-area jurisdiction we checked, with permits and contractor credentials determined by the address. The city normally handles incorporated addresses; county authority can apply in unincorporated areas. Expect an inspection before walls are closed and a final inspection. The licensed contractor pulls the permit; the scope names the city and the fee. Who issues what, which code edition each city is on, and what inspectors look for: Electrical permits and inspections in the Kansas City area.
Insurance questions
Insurers treat knob-and-tube differently: some decline the house, some write it at a surcharge, some want a licensed electrician’s inspection letter first. Ask your agent for the carrier’s written position before deciding the scope. What underwriters, lenders and buyers commonly ask for afterward — the permit record, the final inspection, an itemized invoice naming the circuits replaced, an accurate panel directory — is laid out in Buying a Kansas City home with knob-and-tube wiring. Ask the written scope to list the documents delivered at close.
What a useful estimate includes
A knob-and-tube estimate you can compare against other bids names, at minimum:
- The circuits being replaced — by room, with the count of outlets, switches and fixtures.
- Whether the panel is being replaced, and the service size before and after.
- Whether a utility service upgrade is included, and who coordinates it with Evergy, BPU or Independence Power & Light.
- What happens to abandoned wiring.
- Wall repair: which holes, to what finish, by whom.
- Permit and inspection fees, and the city.
- Code-required additions: AFCI breakers, GFCI locations, tamper-resistant receptacles, and any outlets added to bring rewired rooms to current spacing rules.
- Schedule: working days, no-power days, and the inspection dates that gate the schedule.
- Lead-safe work practices for a pre-1978 house, by a certified firm.
We publish a side-by-side estimate worksheet built around those nine items. Use it to compare the proposals you receive.
What it costs
We don’t publish a flat “Kansas City average,” because the sources we reviewed do not establish one. The published Kansas City figures run from one contractor’s advertised “$8,000–$15,000” for a 1,500-square-foot house to a $39,000 quote one homeowner received for a 1932 house of 2,000 square feet — and they are not describing the same job. What moves a Kansas City bid, more than square footage: stories and wall access, whether a panel or service upgrade is bundled, the device count under current code, and whether the house is occupied. Published examples, with their sources and scope limits, are in Rewiring cost in Kansas City.
Not ready to talk yet? Start with the planning layer: the complete guide to rewiring an older Kansas City home covers how to tell what wiring you have, what a rewire changes, and how to compare bids.
Frequently asked questions
Is knob-and-tube wiring illegal in Kansas City?
An older wiring type alone does not establish a code violation or prove that a circuit can remain. The electrician and local building department must evaluate condition, alterations and insulation contact under the applicable rules. An insurer, lender or remodel scope may require replacement beyond the permit’s minimum requirements.
My inspector found knob-and-tube in the basement. Is it live?
Not necessarily. Home inspectors report “the type of wiring observed”; they aren’t required to trace whether it’s energized. (InterNACHI Standards of Practice, 3.7) Houses that were partially rewired often have dead knob-and-tube left on the joists. An electrician traces it at the panel and tells you which, if any, is still carrying power.
Can I blow insulation into the attic if there’s knob-and-tube up there?
Not while it’s energized. The NEC prohibits knob-and-tube in spaces insulated with loose, rolled or foamed-in material that envelops the conductors. The usual sequence is: replace the attic circuits first, confirm the old wire is dead, then insulate.
How long does it take?
The duration depends on the number of circuits, wall access, occupancy, inspection stages and any utility work. Ask the contractor to separate working days, outage periods, wall repair and inspection waits in the proposed schedule.
Will the old wires be removed?
Have the electrician distinguish physical removal from taking wiring out of service. The scope should identify accessible runs to remove, any disconnected wire proposed to remain inside closed walls, and how its status will be documented. Confirm that plan with the local inspector and with an insurer or lender that requires removal; a generic promise to ‘rewire’ does not settle it.