You can take some actions to prevent iguanas from entering your property, or at least reduce their numbers and ease of entering. You may also be able to take some steps to ensure you yard does not attract iguanas to it.
Certain plants attract green iguanas over others. Flowering plants that have their favorite bright colors such as red, pink, yellow, and orange, may attract iguanas to your property. They will frequently return or live in hibiscus and bougainvillea plants while eating them. Choose different plants if possible.
Fruit trees, especially mango trees, can be significant attractants for iguanas. Large mango trees serve as excellent shelter and a plentiful food source. Pickup fruit that has fallen to the ground to prevent iguanas from taking up residence.
DON'T MAKE IT EASY FOR 'EM
Iguanas can walk straight through chain linked fencing, and large ones are known to even get stuck in such fencing. More solid fencing, especially smooth solid fencing or walls are ideal. The white solid plastic fencing that is common now cannot be climbed by iguanas, but often times requires a barrier if it is not close enough to the ground to effectively keep out iguanas.
They will make holes under fences larger to maintain established paths. Remember, iguanas climb stucco, so the photo left, or above shows an iguana-proof solution.