Do I need a permit to build an addition to my home in Texas?

[Kevin Hassold]

So I have a house under contract that has an unfinished addition to it. The addition is roughly 600 SF and has been dried in already. It is still at the studs and will need insulation, electrical and drywall completed. Would I be able to finish out this addition if the seller did not pull permits to build this addition or what exactly needs to be done if seller did not pull the permits to build the additional structure?