Can You Install Recessed Lighting in a Pre-War Apartment with Plaster Ceilings?
Yes, we install recessed lighting in pre-war plaster ceilings. The challenge is specific to NYC — crumbly lath-and-plaster needs a different approach than modern drywall.
How We Handle Plaster Ceilings in Pre-War Buildings
We install recessed lighting in pre-war plaster ceilings using wafer-thin LEDs like the Elco Koto, which requires only a 4-inch hole and no housing — avoiding the crumbly lath-and-plaster that standard remodel clips can’t grip. The wafer sits flush at roughly 1/2-inch thick, so you don’t lose ceiling clearance. Standard remodel housings rely on spring clips that push against drywall; in pre-war ceilings, those clips tear through the plaster and hit empty air behind the lath. Our approach eliminates the housing entirely. Pre-war plaster dust often contains lead (pre-1978), so we use a dust barrier bag on the hole saw and recommend testing before any ceiling work. For a recessed lighting installation in a brownstone with original plaster, this method saves time and avoids patching headaches.
What About No Neutral Wire at the Switch?
We handle pre-war buildings where the switch box has no neutral wire by using Lutron Caséta dimmers (model PD-6WCL), which operate without a neutral — common in NYC buildings wired before the 1960s. The Caséta communicates wirelessly between the dimmer and the Pico remote, so you don’t need a traveler wire either. This makes it possible to add dimming to a plaster-ceiling room without opening walls to pull new wire. If knob-and-tube wiring is present, we evaluate whether a full rewire is needed before installing any new lighting circuit — old insulation can crack when disturbed, creating a short risk.
Can You Install Dimmer Switches with Recessed Lights?
Yes, we install dimmer switches with recessed lights throughout NYC, but compatibility hinges on the dimmer type, the LED driver, and your existing wiring configuration.
Which Dimmer Works with LED Recessed Lights?
| Dimmer Model | Neutral Required? | Max LED Load | Best For | Price Range |
|---|---|---|---|---|
| Lutron Maestro MACL-153M | Yes | 150W LED | Multiple lights, 3-way setups | $30–$40 |
| Lutron Caséta PD-6WCL | No | 50W LED | Pre-war, no neutral wire | $50–$60 |
| Leviton Decora Smart D26HD | Yes | 150W LED | Smart home integration | $20–$30 |
| Philips Hue Dimmer Switch | Yes (hub) | N/A (bulb-based) | Smart lighting control | $50–$60 |
How Do You Install a Dimmer Switch?
- Breaker off: We turn off the circuit at the panel and verify with a non-contact voltage tester — 1 minute.
- Old switch removal: We remove the existing switch and identify line, load, and neutral wires — 5 minutes.
- Dimmer connection: We connect the dimmer’s line, load, neutral, and ground wires using wire nuts — 10 minutes.
- Mount and test: We mount the dimmer in the box, install the wall plate, and test operation — 5 minutes.
What Size Recessed Lights Should I Choose for My Kitchen?
Here is how to choose between 4-inch and 6-inch recessed lights for your kitchen based on ceiling height, room size, and lighting purpose — task versus ambient.
4-Inch vs 6-Inch Recessed Lights for Kitchens
| Feature | 4-Inch Recessed Light | 6-Inch Recessed Light |
|---|---|---|
| Best use | Task lighting (counters, islands, sinks) | Ambient lighting (general room) |
| Beam angle | 40–60° (narrow, focused) | 60–90° (wide, broad) |
| Ceiling height | 8 ft or lower | 9 ft or higher |
| Spacing | 3–4 ft apart | 4–6 ft apart |
| Lumen output | 800–1,000 lumens | 1,000–1,500 lumens |
| Cost per fixture | $5–10 less than 6-inch | $5–10 more than 4-inch |
How Many Lights for a 10×10 Kitchen?
For a 10×10 kitchen (100 sq ft), we typically install 4–6 recessed lights — 6-inch lights at 5-foot spacing give you 9 lights total (3 rows × 3 columns), while 4-inch lights at 4-foot spacing give you 6–8 lights. The beam angle difference matters here: a 6-inch light at 60–90° spreads across roughly 5 feet of floor from an 8-foot ceiling, while a 4-inch at 40–60° covers about 3.5 feet. On a 10×10 layout, that means the 6-inch pattern needs fewer fixtures but leaves the perimeter counter zones darker — which is why mixing sizes works. We recommend 2700K–3000K color temperature for NYC kitchens — warm enough for the space but bright enough for food prep, avoiding the clinical look of 5000K. That color range also flatters the brick and exposed beam finishes common in Brooklyn and Manhattan brownstone kitchens, where 4000K would read too sterile.
Can Recessed Lights Be Installed Between Floors?
Yes, we install recessed lights between floors in multi-family buildings, but fire-rated housing is required by NYC code for ceiling penetrations in fire-resistive construction.
Fire-Rated Housing Requirements for Between-Floor Installations
We install fire-rated housings like the Halo H7RICT or Juno IC21F for recessed lights between floors in NYC co-ops and condos — these are UL classified to maintain the 1-hour or 2-hour fire-resistance rating required by the NYC Building Code. The housing itself is a steel can with an intumescent gasket that seals the ceiling penetration in a fire. These units cost $20–$40 more than a standard remodel housing, but the labor is the same — we cut the hole, mount the housing, and wire it in about 45 minutes per fixture. A non-fire-rated housing between floors is illegal in multi-family buildings and can void your insurance if a fire spreads through the ceiling penetration.
Do You Need a Permit for Between-Floor Installations?
- New circuits: A DOB permit is required for any new circuit added to the building’s electrical system — we handle the application and pull the permit.
- Fixture replacement on existing circuit: May not require a permit — we verify per job, since some co-op boards still want paperwork filed.
- Co-op or condo board requirements: Many boards require permit documentation and a certificate of insurance before work begins, which we provide.
- Post-installation inspection: Fire-rated penetrations may require a DOB inspection after installation — we schedule it and supply the certificate of compliance.
How Many Recessed Lights Per Square Foot?
A simple formula calculates how many recessed lights a room needs based on square footage, ceiling height, and the room’s purpose.
Recessed Light Spacing Formula for NYC Rooms
We calculate recessed light spacing using the formula: room length ÷ desired spacing = lights per row, then room width ÷ desired spacing = lights per column. For a 12×12 kitchen with 6-inch lights at 5-foot spacing, that’s 3 lights per row × 3 lights per column = 9 lights total. That 5-foot spacing delivers roughly 62 lumens per square foot — bright enough for chopping and cooking. For NYC kitchens with perimeter cabinets, we place lights 2–3 feet from the wall for counter lighting and space center lights wider — never centered over a cabinet face.
Spacing Guidelines by Room Type
| Room Type | Spacing (6-inch lights) | Spacing (4-inch lights) | Lights per 100 sq ft |
|---|---|---|---|
| Kitchen | 4–6 ft apart | 3–4 ft apart | 4–6 lights |
| Living room | 5–7 ft apart | 4–5 ft apart | 3–4 lights |
| Bedroom | 6–8 ft apart | 5–6 ft apart | 2–3 lights |
| Bathroom | 4–5 ft apart | 3–4 ft apart | 4–5 lights |
| Hallway | 6–8 ft along length | 5–6 ft along length | 1 per 6–8 ft |
Can You Install Recessed Lighting in a Bathroom or Shower Area?
Yes, we install recessed lighting in bathrooms and shower areas, but code requires specific wet-rated fixtures, GFCI protection, and vapor barriers to keep the installation safe and long-lasting.
Wet-Rated vs Damp-Rated Fixtures for Bathrooms
We install wet-rated fixtures like the Halo H7ICAT with wet-rated trim or the Elco Koto wet-rated version in shower areas, and damp-rated fixtures in general bathroom areas — both required by NEC code for moisture-prone spaces. The distinction matters because a damp-rated fixture in a direct spray zone will fail inside 6–12 months: the gasket corrodes, moisture seeps into the housing, and you get a short circuit or ceiling water stain. Wet-rated housings cost $15–$30 more than standard, but they seal with a silicone gasket and corrosion-resistant hardware that withstands the steam and condensation of a daily shower. In our practice, we’ve pulled out more corroded standard fixtures from Brooklyn bathrooms than from any other room type — the moisture just eats through untreated metal. For a steam shower, skip recessed cans entirely and use LED strip lighting instead, fully sealed and rated for continuous high-humidity exposure.
GFCI and Vapor Barrier Requirements
- GFCI protection: Required for all bathroom receptacle circuits — recessed lights in shower areas must be on a GFCI-protected circuit per NEC 210.8(A).
- Wet-rated within 3 ft: Fixtures within 3 feet of the shower head must be UL listed for wet locations; beyond 3 ft, damp-rated is acceptable.
- Vapor barrier: We seal around the housing with vapor barrier compound to prevent moisture entering the ceiling cavity — common cause of mold in multi-family NYC buildings.
- IC rating: Required if insulation is present above the bathroom ceiling — typical in co-op and condo buildings where the unit above has a finished floor.
How Do I Choose Between 4-Inch and 6-Inch Recessed Lights?
Choose between 4-inch and 6-inch recessed lights based on ceiling height, room size, lighting purpose, and the aesthetic you want — each size solves a different problem.
When to Choose 4-Inch Recessed Lights
- Task lighting: We recommend 4-inch lights over kitchen counters, islands, and sinks — their narrow 40–60° beam puts light exactly where you need it, not all over the room.
- Small rooms: Rooms under 100 sq ft (small bathrooms, hallways, closets) work well with 4-inch lights at closer spacing — 3–4 feet apart gives even coverage without over-lighting.
- Low ceilings: Ceilings 8 feet or lower benefit from 4-inch lights — 6-inch lights at this height can feel visually overwhelming and cast a wide hot spot.
- Modern aesthetic: 4-inch wafer LEDs sit flush with the ceiling surface and are barely noticeable when off — popular in NYC renovations for that clean, minimalist look.
When to Choose 6-Inch Recessed Lights
- Ambient lighting: We recommend 6-inch lights for living rooms, bedrooms, and open-plan spaces — their wider 60–90° beam covers more floor area with fewer fixtures.
- Large rooms: Rooms over 150 sq ft need fewer 6-inch fixtures than 4-inch — saving on fixture costs and installation time. A 200 sq ft living room needs 4–6 six-inch lights versus 8–10 four-inch.
- High ceilings: Ceilings 9 feet or higher benefit from the wider beam angle — at 10 feet, 6-inch lights at 6-foot spacing cover the floor evenly with no dark zones between fixtures.
- Trim variety: 6-inch lights offer the widest selection of trim styles — baffle, reflector, gimbal, wall wash, and decorative options — giving you more design flexibility than 4-inch.
Can You Install Recessed Lighting in a Drop Ceiling?
Yes, we install recessed lighting in drop ceilings using grid-compatible housings or wafer LEDs with adapters — common in NYC basements and commercial spaces.
How We Install Recessed Lights in Drop Ceilings
We install recessed lights in drop ceilings using grid-compatible housings like the Halo H7ICAT with a G-TRK grid adapter, or wafer LEDs like the Elco Koto with a grid adapter — both mount directly to the T-bar grid without cutting the ceiling structure. The housing or wafer sits in a standard 2×4 tile with a clean cutout, and the grid adapter locks into the T-bar channels so the tile carries no structural load. Drop ceilings give us easy access to the wiring above, which means we can run new circuits faster than in drywall — installation runs 30–45 minutes per fixture compared to 45–90 minutes in a finished ceiling. Standard acoustic tiles support 5–10 lbs, and our wafer LEDs weigh about 1 lb, so there’s no risk of sagging.
Wiring and Fire Rating for Drop Ceilings
- Plenum-rated cable: We use CMR or CMP-rated cable for wiring above drop ceilings — standard PVC cable is not code-compliant in plenum spaces.
- Fire-rated housing: Required if the drop ceiling is part of a fire-resistive assembly — we verify per job and install accordingly.
- Tile weight limit: Standard 2×4 drop ceiling tiles support 5–10 lbs — wafer LEDs (~1 lb) and housings (~3–5 lbs) are well within limits.
- Permit: Fixture replacement typically doesn’t require a permit; new circuits do.
Conclusion
Here is a summary of what we covered about recessed lighting installation in NYC — the code requirements, fixture choices, and building-specific challenges that determine a successful project.
Main Takeaways
Recessed lighting in NYC comes with unique challenges — pre-war plaster ceilings, fire-rated assemblies between floors, and code requirements for bathrooms and drop ceilings. Fixture size depends on the room’s purpose and ceiling height: 4-inch lights for task zones and small spaces, 6-inch for ambient coverage in larger rooms. Dimmer compatibility, GFCI protection in bathrooms, and proper spacing calculations all factor into a successful job. We reviewed the key considerations for each scenario — from wafer-thin LEDs for shallow ceilings to fire-rated housings for multi-family buildings — so homeowners can make informed decisions about their lighting project.
