We are in the process of buying a brand new townhouse that is about 80% built. We are getting a good price, but unfortunately the design is not taking advantage of this being a corner unit, and there are no windows on the ground floor in the wall that is not adjacent to any other units. Is it absolutely crazy of me to want to put a window in at a later stage? Would it be extremely expensive to do so? I understand that this would require a Building Consent.