Smart Switches vs. Smart Bulbs in an Old NYC Apartment: The Neutral Wire Decides It

Most smart-lighting advice skips the one thing that actually decides what you can install: whether there's a neutral wire sitting in your switch box. The usual comparisons argue about apps, colors, and voice assistants — none of which matter if the box behind your wall plate holds three wires and none of them is white. In a 1920s Flatbush walk-up or a Park Slope brownstone, that's the normal condition. Here's how to check.

Open the switch plate before you open your wallet

A smart switch is a small computer. It stays powered even when the light is off, and to do that cleanly it needs a neutral — the white conductor completing the circuit back to the panel.

Older switch boxes usually don't have one. Requiring a neutral at the switch is a relatively recent addition to the national code, and New York City didn't move onto a code edition carrying that requirement until the 2025 NYC Electrical Code took effect in December 2025. Anything wired before that was never required to have one, and in prewar and early-postwar buildings they almost never do. The switch only had to interrupt the hot leg, so the box got a line, a load, and a ground.

Two cautions:

• A white wire in the box is not automatically a neutral. In older work it's often a switched leg — a hot conductor that happens to be white. Only testing tells you the difference.
• Pulling a switch out of a live box isn't a casual look. Kill the breaker, or have an electrician check it during another visit.

What the code actually requires

New York City writes its own electrical code: the 2025 NYC Electrical Code (Local Law 128 of 2024, in effect since December 21, 2025) is the National Electrical Code plus local amendments. Two sections decide this question.

404.2(C) requires a neutral at switch locations controlling lighting loads in bathrooms, hallways, stairways, and rooms suitable for human habitation or occupancy. The carve-outs are written for buildings like ours: broadly, where the wiring method already leaves an easy path to add the neutral later — conductors arriving in a raceway with room to pull one more, or cable entering through an open framing cavity or an unfinished wall. And it governs work being done now. The code isn't retroactive, so an existing prewar switch box isn't a violation for lacking a neutral.

404.22 is the piece almost nobody mentions. Since January 1, 2020, electronic lighting control switches must be listed, and must not introduce current onto the equipment grounding conductor during normal operation. Switches that do — the classic no-neutral design — have to be listed and marked for replacement or retrofit use only. So no-neutral smart switches aren't outlawed; they're fenced into the retrofit lane, and the marking on the box is what proves the device belongs there.

Smart bulbs dodge the wiring problem and create a people problem

Smart bulbs need no new wire, which is why they're the default advice. The catch: a smart bulb needs constant, uninterrupted power to stay smart. Flip the wall switch off — a guest, a kid, a spouse who has flipped that switch for eleven years — and the bulb drops off the network. Voice commands and schedules stop working, and nothing announces it — the lights just go dumb until someone flips it back on.

They also scale badly. One smart bulb in a bedside lamp is cheap; eight in a dining room chandelier is a different number, and every one is a device you'll eventually replace.

Making the call for your apartment

1. Neutral present in the box — install a smart switch or dimmer. It works with ordinary bulbs, the wall switch still behaves normally for everyone else, and one device controls the whole fixture group.
2. No neutral, finished plaster you're not opening — either a no-neutral smart switch listed and marked for retrofit use, or smart bulbs on a switch you leave permanently on.
3. Already renovating or opening walls — run the neutral now. Cheapest it will ever be, and the constraint disappears permanently. Worth raising during any rewiring or gut-reno scope.
4. Dimming quality matters — no-neutral dimmers are the fussier design. Manufacturers publish compatibility lists showing which LED lamps a given model will actually drive without flicker or buzz. Check your bulbs against that list before you buy, not after.
5. Buying in 2026 — look for Matter certification. It's the interoperability standard the major ecosystems have converged on, so a certified device isn't tied to one app or one company.

Where NYC permits enter the picture

Swapping a device for a like device on an existing circuit sits at the light end of the scale. Running a new neutral to that box, or adding a circuit, is a wiring modification: filed through DOB NOW by a NYC-licensed electrician, then inspected. Electrical permits in the five boroughs are pulled by the licensed electrician, not by the homeowner — and in a co-op or condo, your building's alteration agreement comes first.

Check the box first

Almost every smart-lighting disappointment we're called about traces back to a decision made before anyone opened the switch box. If you want someone to confirm what's in your walls and spec the right approach — including any lighting installation that goes with it — Chazon Electric is licensed & insured and works across all five boroughs. Call (718) 924-8062 and we'll tell you straight what your wiring supports.