If you have property in Lavon, and you need repair work for your foundation, then you likely need a permit. Here are one link to help you discover whether you need to acquire one to be compliant:
Stratum Foundation Repair also has created several videos showing examples of foundation problems, such as visible cracks. You are welcome to watch our videos at this link.
Here is one of the videos which may give you a better example of a residential property with foundation-related problems: