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Use a cage at least 8 feet by 3 feet by 6 feet (2.4 meters by .9  meters by 1.8 meters). As a rule, the larger the cage, the better. Without enough room, your iguana won’t be able to thrive and may wind up sick or depressed. Wire cages are suitable if you live in an area that is consistently hot and humid. Otherwise, you will need a large glass tank or enclosure to make sure you can maintain your iguana's environmental conditions. After you pick your cage or enclosure, place substrate across the bottom of it. Use specially designed reptile carpet or flat or shredded newspaper. Avoid bark, woodchips, treated wood, or plastic. Because iguanas live in heavily wooded areas, your iguana will need lots of space and different types of things to climb on. Do this by placing a variety of large branches or specially designed platforms in the habitat. In addition, provide a variety of rocks for the iguana to climb on.  Make sure any branches or structures you place in the habitat are large and strong enough to support the iguana. Provide ramps for your iguana to climb to different levels of its habitat. Opt for smooth/flat rocks that your iguana can comfortably lay on. A box or cave-like area will allow your iguana to hide when it feels threatened or scared. Ultimately, a hiding area is an important part of any iguana habit. Without one, your iguana will feel vulnerable and may not thrive. Place a small wooden box under some rocks. Small plants will help transform your iguana’s habitat into a more interesting environment that better simulates the wild. Depending on the plants you place, your iguana may eat them or hide in them. Some plants to include are:  Acacia Aloe Bamboo Thistle Jade plant Dandelion

Summary:
Purchase a large cage. Spread substrate across the bottom of the habitat. Provide things for your iguana to climb. Create a hiding area. Place small plants in the habitat.