How to Prepare Your Home for Holiday Light Installation

I have been operating the Gehring Holiday Lighting Company. November is my month to get calls with the same issues- people who attempted to work it out by themselves at home and hit the window.

The issues never change. Blown circuits. Falling displays. Lights appear dishevelled rather than enchanted.
Here’s what I know after installing lights on hundreds of homes: preparation matters more than anything else.

The reason why most people do not do prep is that they desire to see lights up at higher speed. Last December a guy was panicking at me. All his roofline was struck off by a windstorm. He never cleaned up his gutters and the clips could not stick. Another customer had blown three breakers on the occasion of Thanksgiving since he had not checked on his electrical load.
Whether you are DIY-ing this year, or attempting to leave the decision-making of whether to DIY or hire professionals, this guide explains the steps in preparation that do actually matter.

Why Preparation Matters for Holiday Light Installation

Efforts of poor planning are money-wasting and a waste of time.

I have observed that homeowners have wasted up to 400 dollars to install lights only to find out that their electrical supply could not support the light bulbs. I have witnessed the indoor extension cords being used outdoors- they literally melted down before Christmas. And I have changed three displays this year which fell off as no one wiped the mounting surfaces clean the first thing.

The installations of professionals begin with preparation. We measure electrical capability, test receptacles, measure surfaces, routing. That is why pro exhibitions are maintained throughout the season whereas DIY projects tend to give up midway. This can be done successfully on DIY. Just prepare the right way.

First, Check Your Electric System

This is where most DIY projects fail.

Walk to your breaker panel. Open it. Check the breaker numbers-typically 15 or 20. Those figures define the number of lights that can be powered.

Basic capacity:

15-amp circuit = 1,800 watts max
20-amp circuit = 2,400 watts max

But never use full capacity. Follow the 80% rule:

15-amp circuit: stay under 1,440 watts
20-amp circuit: stay under 1,920 watts

I learned this my first year. Adjusted the circuit of one client to 1,750 watts because we had plenty of space. Breaker went off at night at 6 PM. Their garage and bathroom were also powered by a turned out circuit. Those additional burdens drove it on.

Discover What Shares Your Tracks

Switching off Flip breakers one by one. Note what stops working. Outlets used in the outdoor are likely to be powered by:

Garage outlets
Bathroom GFCI outlets
Kitchen appliances
Outlets in the living room or bedroom.

Write it all down. This is needed in calculation of total load.

Test Every Outlet

Test your outlets prior to purchasing lights.

I have a basic three prong tester. Costs $12 at any hardware store. When you plug it in you know at a glance whether wiring is done correctly or not.

Check for damage first. Cracks in the outlet face. Rust on the metal. Loose covers. I

opened the covers and there was half-empty water.

Test voltage. Use a multimeter. Should read 110-120 volts. Below 105 is the indication that there are wiring issues.

GFCI protection is required. Press the test button. It should click and cut power. Press reset and power is reinstated. In the event that it does not happen, you are not guaranteed and should repair that outlet.

I had a client affirm that his outlets were good. Tested them anyway. identified two of reversed polarity, hot and neutral wires reversed. Does the outlet have a designation of a backwards wired outlet? Waiting for a fire hazard to occur.

GFCI circuits or outlets reduce power within milliseconds in case they sense a ground fault. They have brought life to this business. All outdoor outlets should be GFCI casing.

Calculate Total Wattage

This gives the difference between success and disaster.

Write down all things you are plugging. All the strings and all the inflatables and all the decorations that are animated.

confirm the power consumption of every item. Usually on a tag near the plug.

LED vs incandescent changes everything:

Type of Light	Wattage /100 bulbs
LED string lights	4-6 watts
Incandescent mini lights	40-60 watts
LED C9 bulbs	8-12 watts
Incandescent C9 bulbs	70-90 watts

See that 10x difference? Ten strings of LED will run on the power of one incandescent.

I changed my whole business three years ago to LEDs. Equal brightness, much less power, customers do not short-circuit.

Actual case: Client did not want to replace his incandescent lamps. We estimated his display to be 2,800 watts. Outdoor circuit capacity 1,440 watts safe capacity.

We had to use extension cords to three circuits in order to get it to work. Next year he switched to LEDs. The whole display used less than half a circuit at 400 watts.

Add up your total. In case you are overcapacity, you have three alternatives:

1.Use fewer lights
2.Switch to LEDs
3.Divided into several circuits.

Layout Planning Before Purchase

That is how people always do it in reverse. They purchase lights, and only after that, they decide where they belong.
Don’t. I use half an hour to three-quarters of an hour planning layout prior to any job. Eliminates the chance of purchasing the incorrect amount of items and/or of putting up imbalanced displays.

Sketch Your Home

Walk around during daylight. Carry a notepad and a tape measure.
Draw your roof line, your windows, and your trees, and railings. Mark where you want lights.
Doesn’t need to be artistic. Just functional. Consider street presence. That back corner nobody sees? Skip it. Pay attention to front facing roof lines and emphasis on trees. Used to have a client who insisted on having his roofline and sides and back lit. Cost doubled. On the street showing any influence? Perhaps even 10 per cent. superior to the front.

Measure Everything

Every roofline section. Every window frame. Every tree you’re wrapping.
Add 15% to every measurement. Corners eat length. Connections eat length. Curves eat length. It takes 57 feet of lights to have that “50-foot roofline” This is because in 4+ years, I did not have a client who asked about additional lights. I have had dozens of individuals who got frustrated out of running short.

In case of trees: 100 lights per vertical foot should be used. To appear complete in the street, a 10 foot tree requires approximately 1,000 lights.

Choose the right Lights for Every Location

Rooflines: C7 or C9 lights (LED icicle lights). Bulbs of higher size can be seen at a distance. Roof lights reduce to miniature size.

Windows: Mini lights or net lights. You desire description, and not too much gilt.

Trees: Mini lights or super broad lights. Climb up the trunk, and then on branches.

Railings: Rope lights, or pre-lit garland. They follow the curves more than do the rigid strings.

Walkways: Lights on the ground, either stake lights or rope lights. Safety issues–you should have lighted up the routes so that no one falls.

Select a single color temperature. The combination of warm and cool whites is amateurish. Pick one and commit.

Get the Right Tools and Safety Equipment

Ladders

You need two types. Low area step ladder, A-frame. Roofline extensions ladder.

Obtain a ladder of at least a 25 percent greater weight than your weight and your equipment.

When you weigh 180 pounds and have 20 pounds of lights then you will need a ladder of 250 pounds rating.

The annual number of people in hospitals is a result of ladder malfunctions. Don’t cheap out.

Safety basics I follow:

There will be three points of contact.
Should not go further than arm longer to each side.
Position at right angle (base 1 foot out in every 4 feet up)
Make somebody hold the bottom.

Extension Cords

This is the point that DIY is perilously incorrect.

Have 12-gauge or 14-gauge cords only which are of outdoor grade.

Indoor cords become overheated. I have witnessed melting insulation, burnt plugs, scalded outlets all caused by the low quality indoor cords being used outdoors.

Calculate length

Measuring distance between outlets and farthest lights.
Routing around obstacles will require an addition of 20 percent.
Shop in hardware stores, not in discount stores.

I would only use 12-gauge cords on the job. The price disparity is so insignificant in comparison with the safety improvement.

Mounting Hardware

What works:

Plastic light clips
Tie down hooks, which are designed to be used outside.
Hooks on the cup screwed on the fascia.
Zip ties for securing cords

What to avoid:

Staples made of metal (through insulation)
Nails driven through cords
Duct tape (fails in cold)
Whatever punctures insulating wire.

I have answered calls in which people stapled lights with the normal staples. Through insulation came Staples, water came In, strand shorted. One even burned the fascia board.

Safety Gear

Palm textured work gloves. The cold weather must have grip and protection. My synthetic leather has rubberized palms.

Deep tread non-slip boots. During cold days, there should be traction on the ladder. Shoes with smooth soles should be avoided.

Safety glasses. Branch and falling hardware protection.

Hard hat when it is under trees. Eliminates injuries of falling objects on the head or fractured branches.

Testing Equipment

Install a test facility in your garage.

You need:

Outlet tester ($10-15)
Multimeter ($20-40)
Additional light string fuses.
Replacement bulbs

Pre-test all the items to be installed. Every strand, every bulb.

It is irritating to see dead bulbs lying on the ground. It is enraging to have them after three times up a ladder.

Timers and Power Strips

Weatherproof outdoor power strip covers. Find individual switches, surge protection and GFCI.

Your display is automated by programmable timers. Digital timers are flexible as compared to mechanical.

Wifi timers Smart Wifi timers can be controlled by phone. Helpful if you’re traveling.

Prep Your Exterior Surfaces

Clean gutters, eaves, and mounting surfaces thoroughly

Everyone skips this step. Don’t. Hardware does not adhere to the dirty surface. Clips are falling off, displays are hanging, you do it all over in freezing weather.

Clean Gutters Completely

Rooftops are primarily mounted on gutters. Process:

Remove all debris by hand
wipe with hard brush and light detergent.
Rinse with garden hose
Let dry completely

Last November, a homeowner informed me that his gutters were very clean. Grew to the top and discovered three inches of leaf sludge. I wasted an hour in cleaning before I was able to start. What this is important: Gutters will not be gripped when dirty. They slip off under wind. Besides, blocked gutters spill over during thaws and the water splashes on your electrical connections.

Scrub Eaves and Fascia

Apply hard brush and weak detergent on:

Clips are attached in fascia boards.
Eaves where lights hang
Window frames
Porch railings

What appears to be clean when seen on the ground may be infested with spider webs and dust when viewed closely. I apply low pressure washer to this. Lasts 15 minutes and clips are available with smooth surfaces to hold on.

Fix Damaged Surfaces

Walk your perimeter. Check for:

Loose siding
Cracked trim
Failed caulking
Peeling paint
Rotted wood

The significance of this: Damaged surfaces are unable to sustain weight. I have accidentally stripped off loose siding. Fix before installing:

Re-secure loose siding
Replace rotted trim
Touch up peeling paint
Re-caulk failed seams

One of the clients possessed beautiful cedar shingles which appeared flawless. Began to cut off the light and some merely broke–rotted at the back.

Trim Trees and Shrubs

The problems are created by overgrown vegetation:

Placements are interfered with by branches.
Branches that are in motion destroy wires.
Branches that are not alive fall and destroy exhibits.

Trim:

Branches over rooflines
Branches along the light paths less than 6 feet.
Branches that are dead in the areas of electricity.
Bushes covering foundation displays.

Use sharp pruners. Make clean cuts. Don’t use stubs, they are ruined by snow-hurricanes.

Remove Loose Stuff

Check for:

Loose shutters
Wobbly downspouts
Unstable garden ornaments
Dead plants in window boxes

Light poles are blown down by loose objects during the storm. One of the clients had ornamental shutters which were not fastened. The first wind storm struck them against the house overnight and ripped off two light portions.

Safe Electrical Connections

Install Weatherproof Outlet Covers and GFCI Protection

Get Proper Outlet Covers

Normal covers do not safeguard outlets when plugging cords in. You need “in-use” covers. What makes them work:

Cords on which there is a closing lid.
Foam gaskets which surround cords.
Connections are enclosed in deep chambers.
UV-resistant materials

I have changed dozens of burnt outlets where people had a simple flip-up cover. Water gets inside, connections are corroding, heat is accumulating, outlet breaks. Good covers cost $15-25. Compared to changing burnt outlets.

Verify GFCI Protection

This is necessary for the latter outdoors. GFCI sockets shut down within 1/40 th of a second in case of difficulties. The speed eliminates shocks and electrocutions. Test it:

Power to Press TEST power should cut off.
Press RESET power is supposed to go back.
In case nothing occurs, the outlet is not guarded.

In case you do not have GFCI then you should employ an electrician or use portable GFCI adapters. I carry adapters to every job. When there is no outlet protection we use adapters instead of exposing safety.

Test Everything

Testing steps:

Check the outlets prior to commencement.
Check each extension cord separately.
Check every strand of the light before hanging.
Mark off when you are done with a test.

Finds solutions to problems as they arise rather than to problems later. For extension cords, look for:

Cracks in insulation
Loose plugs
Bent prongs
Overheating signs

Throw out damaged cords. Don’t repair it with tape. Not worth the fire risk.

Route Cables Safely

Avoid high-traffic areas:

Main walkways
Driveway crossings
Paths to patio
Where delivery drivers walk

When cables are required to pass over walkways: Outdoor cable protectors are used. These rubber mats allow individuals to walk freely around cords. Wholesale never draw ropes across pavements. I have witnessed people falling down and sustaining injuries, cars squashing plugs, people trampling insulation. It is sometimes the long way home. Take some extra cord, use it to come around all obstacles rather than cutting through the traffic. In case it is repeated: Lay in buried conduit. Expenses between 200 and 400 however lasts decades and offers power without any visible cords even in bad weather.

Should You Hire Professional Holiday Light Installation?

4+ years later, I understand precisely who the beneficiary of DIY tools and professionals is.

DIY works if you:

Have single-storey with easy access rooflines.
Feel comfortable on ladders
Have 6-8 hours to spare
Want a simple display
Plan to reuse the same design

Hire pros if you:

Complicated or two story roofline.
Don’t own proper equipment
Desire fancy custom made.
Waste not on installation cost but value your time.
Exist physically on ladders which are unsafe.
Light Want lights taken down and stored after.

Typical pro costs in 2025:

Basic single-story: $300-600
Two-story with trees: $800-1,500
Elaborate displays: $1,500-5,000+

Covers design, installation, maintenance, removal and storing. Many clients tried DIY, a year, two years and then went to professionals. Most of the reasons include: No time, Never looked this good I wanted, Ladder work no longer safe.

Start Early

Start preparation 2- 3 weeks before you desire lights on. Timeline: Week 1: electric check, outlet test, designing of the layout, planning. Week 2: purchase equipment, wash surfaces, fix, repair. Week 3: Installation Rushing leads to shortcuts. Shortcuts lead to problems. Those who plan in November relax in December. Individuals who scramble during post Thanksgiving call me when things go wrong.

Holiday Light Installation Blog Post IMG

Final Thoughts

Installation is not complex, particularly by professionals. It is a systematic planning and deliberate effort. Start with electrical. That is where safety is in the first place. Test capacity, check GFCI, compute loads. Plan your layout. Measure accurately. Choose the right lights on the features. Obtain the right equipment and personal protective equipment. The quality equipment simplifies everything and provides safety. Prep surfaces. Clean the gutters, repair the damage, cut the vegetation. These monotonous activities preserve lights in their places. Have safe connections with weatherproof covers, GFCI protection as well as smart routing. Preparation is the key to success with or without professionals. Take the time. Do it right. You will be glad later on that you did it and you are drinking hot cocoa indoors and your display is making the night bright.