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The average cost to have a professional install Christmas lights on a roof is about $420, with most homeowners spending between $220 and $650. Some companies may charge between $1.25 and $3 per square foot, excluding the cost of the lights. For extensive or complex jobs, the cost can exceed $1,000. While doing it yourself can save money, it is only recommended if you are comfortable working at heights.

You can take a few steps to prolong the life of your holiday lights. Make sure to replace burnt-out bulbs as quickly as possible to avoid overloading the rest of the circuit and knocking out more lights. Before packing them up each year, plug each strand into the wall to confirm everything is still working. Wrap the lights carefully back into their original packaging or something similar—winding a strand tightly together or leaving it to hang loose in a storage bin can lead to frayed or damaged wiring. 

You should always hang the lights before the ornaments because hanging lights on top of ornaments can cause some to fall off. If a light sits directly on top of an ornament, it can cause it to heat up and possibly change its color or cause it to crack. 

Yes, you must use an extension cord specifically rated for outdoor use to power outdoor lights, such as Christmas lights. Extension cords intended for indoor use lack the protective properties to withstand exposure to outdoor elements. To safely hang and power lights outside your house or in your yard, always connect them to an outdoor power source using an outdoor-rated extension cord.