Domestic pets can wipe out a wild population. Sometimes the lizard is just stunned and when brought inside they hide in safe areas to recover. We provide food.
Many lizards eat a wide range of insects and invertebrates.
Houses are generally safer since many animals prey on lizards, including snakes, birds, mammals and even other lizards. The temperature in a house is generally nicer than the temperature outside. Lizards, like all reptiles, are ectothermic, meaning they regulate their body temperature. Very hot and very cold days are hard for them. If a lizard does go into your house they will not hurt anything.