Iguanas will grow rather large (anywhere from 4 to 6 feet long) so they will need a home suitable for their size. For hatchling iguanas, a 55 gallon terrarium or larger will do for a year or so. An adult iguana will require a much larger enclosure. This may consist of a 6'Hx6'Wx4'D custom built enclosure.The bigger the enclosure, the less stress will be inflicted on your iguana. If you want a safe substrate to use, I suggest newspaper. Although it doesn't look visually pleasing, it is very convienient to use and easy to clean up.

Include foilage in your iguana's enclosure. Preferably plastic plants to ensure that any poisoning doesn't occur with the consumption of real plants. Since iguanas are tree dwelling reptiles, they need branches or platforms to perch on and to bask in the heat. A good perch consists of a branch twice the width of the belly of the iguana, and sturdy enough to support it's weight. Also provide a pool of water for soaking. Clean the water container with hot bleach water. A humidifyer should provide all the neccessary humidity for larger enclosures.

Other considerations should also be accounted for.
Here are some questions you should ask yourself when constructing an enclosure:

Can my iguana escape out of this enclosure? Is the enclosure large enough to house my iguana? Is the enclosure safe for my iguana? Does the enclosure provide adequate ventilation? Does the enclosure have access for cleaning? Will the enclosure require frequent maintanence? Are my iguana and I satisfied with the enclosure?

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