Recessed lighting — also called can lights or pot lights — creates clean, modern illumination without bulky fixtures hanging from the ceiling. Retrofitting recessed lights into an existing ceiling is a manageable DIY project if you are comfortable with basic electrical work. New-construction installations in open framing are even simpler.

How to Install Recessed Lighting

Planning Your Layout

The general rule for spacing recessed lights is to divide the ceiling height by two. In a room with 8-foot ceilings, space the lights 4 feet apart. This provides even, overlapping coverage without dark spots.

For task lighting over a kitchen counter or workbench, space lights 2 to 3 feet apart and position them 12 to 18 inches out from the wall so the light falls on the work surface rather than in your eyes.

Sketch the layout on paper. A 12-by-14-foot living room with 8-foot ceilings typically uses six to eight 6-inch recessed lights. Start by centering the fixtures in the room, then adjust as needed to avoid joists, ductwork, or existing electrical boxes.

Choosing Fixtures

Remodel (Old-Work) Cans

Designed for finished ceilings. They slip through a cut hole and clamp to the drywall with spring clips. No access to the space above the ceiling is needed. These are what you want for retrofit projects.

New-Construction Cans

These mount to ceiling joists before the drywall goes up. If you are remodeling with open ceilings, use these — they are sturdier than remodel cans.

Wafer-Style LED Downlights

The newest option: an ultra-thin LED disc that mounts directly to a junction box. No can housing at all. They are the thinnest option and work where ceiling cavity depth is limited, such as between floors in a two-story house.

Size

Six-inch is the most common for general room lighting. Four-inch fixtures work well for accent lighting or smaller spaces. Match all fixtures in a room for a consistent look.

IC Rating

If the ceiling has insulation above it, the fixtures must be IC-rated (Insulation Contact). Non-IC fixtures require a 3-inch clearance from insulation, which is nearly impossible to maintain in a finished attic floor. Always use IC-rated fixtures in insulated ceilings.

Tools and Materials

Recessed light housings (remodel type)
LED trim or LED retrofit modules
14/2 or 12/2 NM cable (matching the circuit)
Wire nuts, cable staples
Hole saw (sized to match the fixture — usually 6-1/8 inches for a 6-inch can)
Drill
Stud finder
Drywall saw (backup for hole saw)
Multimeter or voltage tester
Fish tape or flex bit for running cable

Installation — Retrofit

Step 1: Mark and Cut Holes

Transfer your layout marks to the ceiling. Use a stud finder to verify each mark is clear of joists. Drill a small pilot hole first, then poke a wire up through it to feel for obstructions.

Cut the holes with a hole saw on a drill. Work slowly to keep the cut clean. Drywall dust is messy — lay drop cloths.

Step 2: Run Cable

Turn off power at the electrical panel. Run NM cable from the power source (an existing switch box or junction box) to the first fixture location. Then daisy-chain from fixture to fixture.

In a finished ceiling with attic access above, this is straightforward — lay the cable across the joists. Without attic access, fish cable through the ceiling cavity between the holes using fish tape.

Leave 12 inches of cable at each hole for connections.

Step 3: Wire the Fixtures

Each remodel can has a built-in junction box. Open the box, feed the cable in through the cable clamp, and make the connections: black to black, white to white, ground to ground. If daisy-chaining, two cables enter the box — wire all blacks together, all whites together, and all grounds together.

Step 4: Install the Cans

Push the wired housing up into the ceiling hole. Squeeze the spring clips and push them up alongside the housing. Once the can is flush with the ceiling, release the clips — they spring outward and grip the drywall, pulling the housing tight against the ceiling surface.

Step 5: Install Trim

Snap in the LED trim or baffle trim. Most modern LED trims are one-piece modules that plug into the socket inside the can. They sit flush with the ceiling for a clean look.

Step 6: Install the Switch

Wire a switch to control the lights. Use a dimmer switch rated for LED if you want brightness control — highly recommended for living spaces.

Restore power and test all fixtures.

Common Mistakes

Cutting a hole over a joist. Always check with a stud finder and pilot hole before cutting the full-size opening.

Using non-IC fixtures in insulated ceilings. This is a fire hazard.

Overloading the circuit. Add up the total wattage of all new fixtures and make sure the circuit can handle the additional load. LED fixtures draw very little power, so this is rarely an issue with modern lights.

Skipping the dimmer. Recessed lights at full brightness can feel harsh. A dimmer adds flexibility and extends LED bulb life.

Recessed lighting is one of the most popular lighting upgrades because it is clean, versatile, and adds value to any room. Take your time with the layout, use the right fixtures for your ceiling type, and the result will look professional.