You need to find the source of their entrance first. They can get in through the tinest cracks in walls, doors, windows, etc. You need to go through your house and seal up any small hole that they might be getting in through. To help with ones already in the house you can either get an exterminater or for a cheaper solution, get bug bomb and bomb every room in your house. They require leaving the house for a day or two so you need to stay somehwhere else.
Don't let the lizard come inside,block their way.For this you have to find from where they are coming,close it so that they can't come inside.