Do I need a plumbing permit in Fort Worth?

[Shane Chiasson]

I am updating a house is Southwest Fort Worth. I had a plumber out to fix a clogged sink. He said the old iron pipe had deteriorated and he would have to cut in to the wall to replace the drain pipe. His quote includes permit fees, so I am wondering if the permits are really required. Does anyone have advice or experience with this? Are permits required?