One appealing characteristic of leopard geckos is that, as long as their basic needs are met, they will thrive in just about any type of cage setup. A simple enclosure can work just as well as a more complicated one. For most leopard gecko owners, a 10-gallon aquarium with a screened top will do the trick. An enclosure of this size will give your gecko (or even a pair of geckos) plenty of room to move around and still allow you to add some other items to give it a more attractive look.
A substrate made out of sand is a good choice for adult geckos (for young geckos, try white paper towels) because it allows gradual temperature changes. Heat tape, a light, or a heating pad should be used to control the temperature in the cage. Use a thermometer to frequently check that the temperature remains between 70 and 86°F.
Although leopard geckos rarely drink, it is a good idea to place a shallow water dish in the cage. They get a lot of the moisture that they need through the food that they eat, but the dish will give them water when they need it, and it will also help to maintain proper humidity levels in the cage.
A leopard gecko will appreciate a hiding place in his cage. Since they are nocturnal, they may use it for sleeping, or they may simply use it to hide whenever they feel the need to. Most pet stores sell commercially made hide boxes, or you can use something as simple as a cardboard paper towel roll or a plastic container with a hole cut out of it.