Knob & Tube Replacement in Brooklyn, NY

Brooklyn House Rewiring removes dangerous knob-and-tube wiring from the borough's pre-war homes and replaces it with modern grounded copper. Knob-and-tube was the standard in houses built before the 1950s, but it is ungrounded, its insulation grows brittle and crumbles with age, and it has no ground wire to protect against faults, which is why insurers so often refuse to cover a home that still has it. We trace out the old runs, remove the porcelain knobs and tubes and their cloth-insulated conductors, and rewire with copper NM cable, grounded outlets, and the safety breakers current code requires. The work is permitted, performed by a NYC-licensed master electrician, and inspected so the home is safe, insurable, and documented.

Why Knob-and-Tube Has to Go

Knob-and-tube runs individual conductors through ceramic tubes and supports them on porcelain knobs, a system that was safe enough a century ago but is a real hazard today. It is ungrounded, so there is no ground path to protect people or equipment from a fault, and its rubber-and-cloth insulation dries out, cracks, and flakes away after decades. It was also never designed for the loads of modern life, and homeowners often make it worse by burying it in insulation, which traps heat and accelerates failure. Replacing it is a genuine safety upgrade, not an optional one.

Tracing and Removing the Old System

Homes are rarely all knob-and-tube or none, because previous owners often replaced some runs and left others live inside walls and ceilings. We trace the circuits to find every active knob-and-tube run, identify what is abandoned versus energized, and remove the old conductors, knobs, and tubes as we rewire. Leaving live knob-and-tube spliced to newer cable is a common and dangerous shortcut we never take. Mapping the system fully up front is what makes the replacement complete rather than partial.

Rewiring With Grounded Copper

In place of the old two-wire system we run modern copper NM cable with a dedicated ground, converting ungrounded two-prong outlets to proper three-prong grounded receptacles. GFCI protection goes in at kitchens, baths, and exterior points, and AFCI breakers protect the bedroom and living circuits as code requires. The new wiring is fished through existing cavities to limit wall damage, and it ties into a panel with the grounding to back it up. The result is a home wired to the same standard as new construction.

Insurance, Permits, and Inspection

Because so many insurers will not write a policy on a home with active knob-and-tube, the permitted and inspected paperwork we provide is often exactly what unlocks coverage or a clean sale. Every replacement is filed under a NYC electrical permit, wired by a licensed master electrician, and inspected and signed off. That documentation proves the hazard is gone and the work meets code. We never leave knob-and-tube in service or hand the job to unlicensed labor.

Frequently Asked

Is it safe to leave some knob-and-tube in place?

We do not recommend it. Active knob-and-tube is ungrounded and its insulation degrades unpredictably, and partial systems often hide dangerous splices between old and new wiring inside walls. The safest and most insurable path is full removal of all live knob-and-tube, which is what we do.

Why won't my insurance company cover a house with knob-and-tube?

Insurers see knob-and-tube as an elevated fire risk because it is ungrounded, brittle with age, and easily overloaded or overheated when buried in insulation. Many refuse to write or renew a policy until it is replaced. The permitted, inspected replacement we perform gives you the documentation insurers ask for.

Can you replace knob-and-tube without tearing my walls apart?

In most cases, yes. We fish new copper cable through existing wall and ceiling cavities and open only small access points where needed, so damage is limited and patchable. Some openings are unavoidable, but a careful replacement leaves most of your plaster and drywall intact.

How can I tell if my Brooklyn home still has knob-and-tube?

Telltale signs include two-prong ungrounded outlets, ceramic knobs and tubes visible in the basement or attic, cloth-covered wiring, and a home built before roughly 1950. We can inspect and trace the wiring to confirm exactly how much active knob-and-tube remains before recommending any work.

Service area

Knob-and-tube removal takes us into Brooklyn's oldest housing stock, especially the brownstones of Bed-Stuy, Crown Heights, Brooklyn Heights, Fort Greene, and Park Slope.