Are there major additions that were made to your home by its previous owner? If so, do you know if those additions were done with a proper permit? You might think that it wouldn’t matter for you, but the sad fact is that when you are buying a home, you are also taking responsibility for any violations that never got noticed. If you notice that there have been additions after the home was built, it is worth it to make some extra research to ensure that everything was done properly. Otherwise, it could affect your ability to take out a loan, get insurance coverage, and more. Since the home won’t match what is on record, it will most likely be discovered under scrutiny.
If you want to do a major remodel, it is a good idea to get the help of your contractor with permit related issues. They usually have experience with these things and would be able to obtain the needed permits for you.