- Home
- Services
- Knob-and-Tube Removal
Knob-and-Tube Removal in Southern NH & the MA Border
Insurance won’t renew, the home inspector flagged it, or you just found ceramic knobs in the attic. WJW Electric replaces knob-and-tube with safe, grounded, modern wiring — without tearing your house apart.
The housing stock around Pepperell, Hollis, Brookline, and the older Nashua neighborhoods is full of homes built long before anyone imagined a house would need to run a heat pump, an induction range, and a car charger. Plenty of them still have original knob-and-tube wiring in the attic, the walls, or a back bedroom — and most homeowners find out when an insurance carrier or a home inspector points it out.
Billy Webber is a master electrician licensed in both Massachusetts and New Hampshire, and old-house wiring is some of the most common work he does. Knob-and-tube removal is careful, methodical work — the goal is safe, grounded, code-compliant circuits with as little disruption to the house as possible. Free estimates, and an honest read on whether you need a partial replacement or a full rewire.
What Is Knob-and-Tube Wiring?
Knob-and-tube is an early wiring method used in homes built roughly from the 1880s through the 1940s. Separate hot and neutral wires run through open air, supported by ceramic knobs and passing through framing in ceramic tubes. It has no ground wire, relies on cloth or rubber insulation that becomes brittle with age, and was never designed for modern electrical demand.
It’s worth saying plainly: knob-and-tube was competent work for its time, and finding it doesn’t mean your house is about to burn down. The problem is what the last eighty years did to it — insulation that’s gone brittle, decades of amateur splices buried in walls, junctions covered over during renovations, and blown-in insulation packed around conductors that were designed to shed heat into open air.
Signs You Have Knob-and-Tube — and Why It Matters
Some of these you can spot yourself. Others come up during a sale or a policy renewal:
- Ceramic knobs and tubes visible in the attic, basement, or crawlspace.
- Your insurer asked about the wiring, raised the premium, or declined to renew.
- Cloth-covered wiring instead of modern plastic-sheathed cable.
- Fuse box still in place, or a panel with knob-and-tube feeding into it.
- Two-prong outlets throughout the house — a sign of ungrounded circuits.
- A home inspection flagged it during a purchase or refinance.
- Blown-in insulation was added to an attic that still has old wiring running through it.
- Warm outlets, scorch marks, flickering, or a burning smell — stop using the circuit and call right away.
The Insurance Problem
For most homeowners, this is what forces the decision. Many carriers now won’t write a new policy on a home with active knob-and-tube, and some won’t renew an existing one. Others will cover it at a noticeably higher premium. Requirements differ from insurer to insurer, so your own policy is the thing to check — but “my insurance company told me to” is far and away the most common reason people call about this.
The same issue shows up in real estate. Knob-and-tube discovered during a buyer’s inspection can stall a closing or turn into a price negotiation. Getting ahead of it — with permitted, inspected work and documentation — is almost always cheaper than handling it under deadline pressure with a buyer waiting.
Partial Replacement or Full Rewire?
This is the honest conversation that should happen before any quote. Some homes only have knob-and-tube left in one area — an attic run, a single floor, a few original circuits that survived past renovations. In those cases a targeted replacement solves the problem, satisfies the insurer, and costs a fraction of a full job.
Other homes have it running nearly everywhere, tangled up with ungrounded outlets and an undersized panel. There, replacing circuits piecemeal means paying to open the same walls twice. A whole-house rewire is the better value, and it’s the moment to solve grounding, add the circuits a modern home actually needs, and stop patching.
Knob-and-tube removal also frequently pairs with an electrical service upgrade. Old wiring and an old fuse box tend to arrive together, and if the panel can’t support properly grounded modern circuits, upgrading the service is part of doing the job correctly rather than an upsell.
What the Removal Process Looks Like
1
Walk the house.
We trace what’s actually knob-and-tube versus what’s already been replaced — attic, basement, panel, and outlets. Many homes have less than the owner feared, some have more.
2
Honest scope and estimate.
You get a clear read on partial versus full, what it costs, and what your insurer will likely want to see.
3
Permit.
This work is permitted and inspected in both MA and NH. We pull it and coordinate the inspector.
4
Replace the wiring.
New grounded circuits are fished through existing cavities using attics, basements, and closets for access — minimizing what has to be opened.
5
Retire the old wiring properly.
Abandoned knob-and-tube is disconnected and removed where accessible, not just left live in a wall.
6
Inspection and documentation.
The inspector signs off, and you have paperwork for your insurance company and your future buyer.
Why Homeowners Trust WJW Electric With Old-House Wiring
Rewiring an older home is as much about judgment and care as it is about wire.
- Master Electrician, MA & NH — MA Lic. #23701-A, NH Lic. #16011. Licensed on both sides of the border.
- A master electrician on-site for the work — not an apprentice guessing at century-old wiring.
- Permitted and inspected, with documentation for your insurer.
- Unrestricted Construction Supervisor — CS-121037. Genuinely matters here: rewiring older homes often touches framing, plaster, and permit-heavy work most electricians have to sub out.
- Honest scoping — partial when partial is enough, full rewire when it genuinely saves you money.
- 10+ years in the older housing stock on both sides of the border.
Knob-and-Tube Removal FAQs
Is knob-and-tube wiring dangerous?
It was safe by the standards of its era, but it has no ground wire, its insulation becomes brittle with age, and it was never designed for modern loads. What makes it genuinely hazardous today is usually the accumulation: decades of alterations, buried splices, covered junctions, and contact with blown-in insulation.
Will my insurance company make me remove knob-and-tube wiring?
Many carriers now refuse to write or renew policies on homes with active knob-and-tube, and others charge significantly more. Requirements vary by insurer, so check your specific policy — but insurance is the single most common reason homeowners call us about this.
Do you have to remove all of it at once?
Not always. Some homes only have knob-and-tube in an attic, on one floor, or on a few circuits, and a partial replacement solves it. Others have it throughout and are better served by a full rewire. We walk the house first and tell you honestly which one you’re looking at.
Can you remove knob-and-tube without tearing up my walls?
In most homes, largely yes. New wiring gets fished through existing wall and ceiling cavities using attics, basements, and closets as access. Some patching is usually unavoidable, but a careful rewire is far less invasive than homeowners expect.
Can I put insulation over knob-and-tube wiring?
No. Knob-and-tube was designed to run through open air so heat can dissipate, and burying it in blown-in or batt insulation traps that heat. It’s one of the most common hazards we find in older homes, and a frequent reason attic wiring has to be replaced before insulation work goes ahead.
Does knob-and-tube removal include a new panel?
Sometimes. If the existing panel or fuse box can’t support properly grounded modern circuits, an electrical service upgrade is part of doing the work correctly. We’ll tell you up front whether yours needs it rather than discovering it halfway through.
Knob-and-Tube Removal Across Southern NH and the MA Border
Found Knob-and-Tube in Your Home?
Get an honest assessment from a master electrician licensed in both states — including whether you need a partial replacement or a full rewire.