Does owner need association approval to do work on condo?

We are purchasing a condo unit in Baltimore County MD - Annen Woods. We are still awaiting condo documents to review before settlement. I am planning to totally gut the 30 year old kitchen and remodel, lower two interior walls to open the unit up and install hard wood. I know that 80% rule on the floor and plan to use oriental rugs. I have hired a licensed contractor to handle all efforts. i have been told I must obtain approval of the Condo Association before work begins. How much true control over what I do on the interior of my unit can they have? There is no impact on the exterior of the unit. Thanks for your comments.