If it is your first time installing a fence, then you can ignore this part. Why? When it is the first time, it is better to leave the company to help with permits. It is easier and better for you to learn. Yet, if it is your second or third time, you already know what to do. Getting your own permit will save you some money. Provided you have experience with dealing with the paperwork. If not, there’s nothing bad about leaving it to the contractors. It is better to be safe than sorry, but saving money, is always good.