Assuming you are in England or Wales and that it is a recent development.
There are many and varied things that may affect your situation. It is obviously of concern to you and I would suggest that you make an appointment with a Planning Officer at your local Planning Dept. to discuss the development with regards to both Planning and Building Regulations requirements. You are allowed to view the public details of any Applications. There are a number of things to consider: was Planning Permission required, was building Regulations Approval required, were there any specific requirements/conditions regarding the windows, have the Approved Plans been adhered to, were there any approved amendments during construction.
Building Regulations are pretty much fixed what can and cannot be done, Planning Approval can be at the whimsey of a Committee with complete disregard of the T&C Planning Acts! This is why you are better discussing the development with a Planning Officer; stuff you read in the Planning Portal and other places is for guidance and may not necessarily apply in your specific case.