To put up Christmas lights, you'll need to factor in the cost of the lights themselves, the cost of any necessary equipment like ladders or clips, and the cost of any electricity used to power the lights. The price can vary greatly depending on the size and complexity of the project, but you can expect to spend anywhere from $100 to $1000 for a basic setup. If you're looking to add some extra flair, you may also need to consider the cost of additional decorations like wreaths, garlands, and other festive items.