How permanent Christmas lights are installed, step by step
What actually happens to your house on install day, from the first cut in the channel to the moment the schedule is on your phone.
The short answer
Permanent Christmas lights are installed once, in an autumn visit, by fitting a low-profile aluminum channel of RGBW LEDs along your roofline. The channel is cut to the lengths of your eaves and gables, joined at each peak, and mounted on the fascia board or set in under the drip edge.
The sequence looks like this:
- Confirm the measurement. The footage and peak count from your photo are checked at the house before any channel is ordered.
- Cut the channel. Each level eave and each sloped rake gets its own piece, cut to its own length.
- Fasten it. The channel is fixed to the fascia board or slipped beneath the drip edge, using fasteners that suit what your trim is made of.
- Join the peaks and corners. Mitered ends meet at each ridge and corner so the line reads as one shape after dark.
- Wire the zones. Runs connect back to the controller in groups you can light separately.
- Hand over control. Colors, brightness, zones and a schedule are set up on your phone.
Cutting the channel to your roofline
The channel does not come off a spool and get draped along the gutter. It is a rigid aluminum profile, and every length of it is cut to fit one specific edge of your house. A level eave takes one long piece or a few pieces joined end to end. A gable takes two pieces, one for each sloped rake, cut so their ends meet at the ridge.
Cutting to the house is what makes permanent lighting look built in rather than hung. A seasonal string goes wherever its plug and bulb spacing allow. A channel cut to length can stop right at the corner board, turn right at the peak, and finish right where the garage roof meets the wall. From the street, that precision is the difference between a row of lights and an outline of the house.
The cut list comes from the measurement. LightCast counts the peaks and valleys in your photo, the footage is confirmed in person, and by install day the job is a known set of runs. On a gable-heavy two-story with a main gable, a garage gable and a dormer, that list is long. On a ranch with one front gable it is short.
The channel color is settled before the first cut. It is matched to your trim, because the trim is what it sits against, and that match is the reason the finished install is barely visible in daylight.
Fastening: fascia or under the drip edge
The channel goes in one of two places, and many houses use both on different edges.
| Mount point | What it is | What you see in daylight |
|---|---|---|
| Fascia | The vertical board at the roof edge, running along each eave and up the sloped sides of a gable | A thin line in the shadow under the roof edge |
| Under the drip edge | The metal flashing at the roof edge that steers water off the fascia and into the gutter, run along both eaves and gables | Very little; the channel sits in the lip where the flashing stands off the trim |
Roofing pros recommend setting drip edge so its outer lip sits about 1½ to 1¾ inches out from the fascia board, which lets water fall clear instead of creeping back onto the wood. That small gap under the lip is a natural place to tuck a low-profile channel out of sight.
The fasteners are chosen for the substrate, meaning whatever the channel is going into. Aluminum-wrapped, bare wood and vinyl trim each take a different fastener, and the gutter is never a mount point; what your fascia has to carry covers each one. The aim on all of them is the same: a mount that holds through a Michigan January without splitting the board or working loose.
What never happens: nothing is nailed, stapled or screwed through a shingle, and nothing lifts a shingle course to slide under it. Shingles shed water in overlapping layers, and a hole in one is a leak path waiting for the next ice dam. Keeping every mount on the trim is how the roof stays exactly as the roofer left it. For the longer version of that question, read whether permanent lights damage your roof.
Peaks, valleys and inside corners
Straight eaves are the easy part. The shape of a house lives at its turns, and that is where an install looks either crisp or sloppy after dark.
Peaks
At the top of a gable, the two rake pieces are mitered, cut at matching angles so they close into a clean point. The angle depends on the pitch of that roof, so a house with a steep front gable and a shallower garage gable gets two different cuts. A tight joint at the peak is what lets the lit line read as one continuous shape. A gap or an overlap there is the first thing your eye finds.
Valleys and inside corners
When a gable ties into the main roof plane, the roofline turns inward. That inside corner sits right below a valley, the crease where two roof planes meet and water gathers on its way down. The channel makes its turn on the trim below and stays out of the valley, so snowmelt keeps running exactly where the roofer meant it to.
Outside corners and returns
At the corners of the house, the eave turns and often ends in a short return. These are cut and joined the same way as a peak, so the light wraps the corner instead of stopping just short of it. Whether you light around the corner at all is your call, made when the layout is drawn.
Turns are one reason peaks, dormers and stories push the per-foot price of a house up or down, anywhere from $22 to $34. Every turn is more cutting, more fitting and another ladder move. A Rochester Hills two-story with several gables across the front lands higher in the band than a long, plain eave of the same footage.
Power and zones
Once the channel is up, the runs are wired together and back to a controller. The controller is the box your phone talks to. Where it goes depends on where power is available on your house, which is worth settling before install day. For where that power comes from, and what changes when the outlet is on the wrong side of the house, see where permanent lights draw their power.
Wiring is also when the house is split into zones. A zone is a group of runs you can control on its own: the front eaves, the garage, the porch roof, the gables. Zones do two jobs.
- Design. The garage can glow warm white while the front gables run red and green, or the side of the house can stay dark on weeknights.
- Service. If one run ever fails, the zoning lets us find it without pulling anything down.
Zones are planned with you. Tell us which parts of the house you picture lit on an ordinary evening and which only on holidays, and the wiring follows that picture.
Handing over the app
The last step happens on your phone. The controller is connected and the app is set up, so colors, dimming, zones and schedules are yours to run.
Everyday warm white and holiday color both run from one set of diodes.
You can set one schedule and leave it. After that there is nothing on the calendar: no November ladder, no January takedown, no totes in the basement. The channel is rated for Michigan winters and has no filaments to snap in the cold.
When to book and where to start
Installs happen in autumn and dates go to whoever asks first, so start with getting a permanent lights estimate online if you want to choose your date.
Every step above starts from a number, and you can get yours today from the sidewalk. Take a straight-on daylight photo of the house, open the LightCast measuring tool and tap your garage door for scale. It traces the roofline, counts every peak the crew will miter, and prices the job. A two-story at 130 feet comes out at $2,900–$4,400 installed once; at 200 feet, $4,400–$6,800. When the number looks right, request your estimate with that number attached, and we confirm within 24 hours.
Questions about this
Can the channel follow a dormer or a porch roof?
Yes, if you want it to. Dormers and porch roofs have their own small rooflines, and each one is cut and fastened the same way as the main eave. You can also light only the main eaves and gables, which keeps the footage down and still outlines the house clearly from the street.
Is the footage from my photo the footage that gets installed?
Not until it is checked. The measuring tool gives you a number from one photo, and that number is confirmed on site before any channel is ordered. The cut list for install day is built from the confirmed footage and peak count, not the photo estimate.
Why does my channel look different from the one next door?
Because it is matched to your trim, not theirs. A white-trimmed colonial and a house with brown fascia get different channel colors, so each one blends into its own roof edge in daylight.
Where this applies
Typical roofline lengths and priced examples for these communities are on their own pages.