Rewiring New York apartments, brownstones and row houses

Wire doesn't fail on a schedule, but insulation does. Cloth and early rubber jackets from before the 1960s turn brittle, crack when they're moved, and leave bare copper in the box. Two-wire circuits have no ground at all, so a three-prong outlet on one is a false promise.

Most rewires in the city are done in occupied homes, so we work room by room, keep a working circuit in every room at the end of each day, and open walls only where a fish can't get through.

A full rewire replaces every branch circuit from the panel out. In a brownstone the runs go up through chases, closets and the rear wall, and floor by floor through the ceiling below. We map the existing circuits first, then plan new ones by use: kitchen, bath, bedrooms, heating and cooling. Armored cable is fished through the plaster where possible and surface openings are kept small and square so they patch cleanly. The panel usually changes too, since a new wiring system on an old panel only moves the weak point.

When a kitchen or bath is opened for renovation, rewiring that room while the walls are down costs a fraction of doing it later. We replace everything inside the renovated space back to the panel, add the circuits current code requires for kitchens and baths, and leave the rest of the apartment as it was. It's also the moment to decide on lighting layout, outlet counts and any 240-volt appliance, because moving a box after the tile goes up is where budgets go wrong.

Cloth-covered cable can look fine until it's disturbed. Pull a receptacle forward and the jacket flakes off in pieces. That makes even small jobs on old wiring risky, because the act of working on it damages it. We test insulation where we can, but for circuits with visibly brittle jackets the honest answer is replacement. We start with the circuits carrying the heaviest loads, usually the kitchen and any room with an air conditioner, and work outward from there, room by room.

Two-prong outlets mean the circuit behind them has no equipment ground. Swapping in three-prong outlets without a ground is a code violation and a real shock hazard for anything with a metal case. There are two legitimate fixes: pull new grounded cable, or protect the ungrounded circuit with GFCI and label the outlets. We'll tell you which circuits can take new cable easily and which make sense to GFCI-protect for now, so the spend goes where it matters most for safety.

A one-bedroom apartment is usually one to two weeks of work in phases, a larger apartment two to three, and a brownstone longer depending on floors and access. Plan review can add time for complex filings, so we file early and tell you the inspection window. Patching follows the inspection, since the inspector needs to see the work before walls close.