How much is a car?
I'm not trying to be a smart aleck it's just as the other agents have said, costs will vary based on square footage, materials used, type of addition (bedroom vs kitchen) etc. We have many reputable contractors in the Pensacola area. I would suggest that you speak to 3-4 LICENSED contractors about your plans. Ask them to give you references then contact those reference and go look at the work that they have done.
Good luck on your project. Please let me know if I may help you in any other way.