How to Install Christmas Lights Outside

Here is the method we use, minus the access equipment. Read the last two sections before you decide to do the roofline yourself.

1. Plan it on paper first

Photograph the front of the house in daylight and draw the runs on the photo. Decide the primary line — usually the roofline — and stop there if the budget or the daylight is short.

Measure each run with a tape or a measuring wheel, add ten per cent for corners and drops, and write the total down. It decides everything you buy.

2. Buy for outdoors, and buy once

Rating

IP44 minimum, IP65 for anything in driven rain

Type

Low-voltage LED with an external transformer

Sets

Connectable, not four separate strings with four plugs

Colour

Warm white, one temperature across everything

Density

Around 100 LEDs per metre for an unbroken line

Supermarket sets are built for one season. If you plan to put lights up again next year, commercial-grade pays for itself on the second December.

3. Test everything on the ground

Lay every set out on the lawn or the drive, connect it exactly as it will run on the house, and switch it on for ten minutes. Faults are almost always present out of the box, and finding one at ground level costs nothing.

4. Sort power before you climb

You want an outdoor-rated socket or a weatherproof enclosure, an RCD, and a drip loop so water runs away from the connection rather than into it. Put the whole scheme on one timer — dusk to 11pm is what most people settle on.

5. Fix to the surface, not through it

Work outwards from the power source, so you never have to unclip a finished run to reach a plug. Never nails, never staples: a staple through the cable is the classic January failure and it voids the set's warranty.

6. The ladder, honestly

Most accidents happen on the second trip up, in the dark, carrying something. If you are doing it anyway:

1. 1Ladder at one out for every four up, feet on firm level ground, tied or footed by someone.
2. 2Three points of contact at all times. Lights in a bag over the shoulder, never in a hand.
3. 3Never lean sideways — move the ladder, every time, however tempting.
4. 4Never work on a wet, frosty or windy day, and never alone.
5. 5Never step onto a roof slope. Tiles are lethal wet and brittle cold.

7. Dress the run

Once fixed, walk to the pavement and look. Sags, gaps and one bulb pointing at the sky are all obvious from thirty feet and invisible from a ladder. Adjust from the ground's point of view, not the climber's.

8. Take-down matters too

Take lights down in the first two weeks of January while the fixings are still sound. Coil each run round a piece of card rather than an elbow, label it with the elevation it came from, and store it dry and indoors. Next year takes half the time.

What a professional does differently

Three things, and they are the three that cost money: proper access equipment instead of a ladder, commercial-grade lights on a single controlled circuit, and a return visit within days if anything fails mid-season.