You can either purchase or build this house. Any enclosure should be at least 3 feet tall with plenty of branches and rocks for climbing and basking. Any branch or rock you decorate his home with should be free of sharp edges and splinters. You don't want him getting anything stuck in his scales. Although carpet looks nice on your floor, your green friend will be much happier with folded newspaper on his.
Carpet holds bacteria and germs and requires frequent cleaning.
By saving your old newspapers you will have an endless supply of floor coverings for him, and he will have a much more sanitary home. Should any of these things become lodged in his mouth or under his tongue you would have a very sick creature to contend with. He will greatly appreciate it if you place aquarium plants on his walls so that he may climb on them. He also likes his privacy and will hide in the greens you hang. If using real plants, make sure they are iguana compatible.