Most reputable contractors and remodeling companies will be upfront and honest with you about the permits that are required by law. After all, it's in their best interest to follow the rules so they don't get fined, shut down, or lose their license. However, there are some less reputable companies that will offer to do unpermitted work. As the homeowner, it's in your best interest to verify whether the remodeling work requires a permit or not. If you find out that you are required to get a permit and the company you hired is willing to continue without one, you might need to ask yourself where else they are willing to cutting corners. An offer to do unpermitted work where a permit is required is a big red flag. I recommend you find a more reputable contractor.