Regarding leaving window on the wall facing my neighbor

I am building a house. The plot size is so thin that leaving a set back for the purpose of windows was not possible. So I am leaving windows on the first floor of my house facing my neighbor's property. His house is an asbestos roof one. As there was no set back possible to leave so I am getting the windows with sliding doors so as to not make any encroachment in my neighbor's land. Now he is objecting construction of my windows and forcing me to close it. He is also threatening me and my family. As this is only way to the sunlight and air to our property we tried to make him understand that our windows will be already closed when he will construct his home so till that time we can have windows. But he is so resilient and is now acting so violent. His home is already fully visible from all the nearby houses so there is no such case of violating his privacy. But now they are abusing us and giving us threatening. Please guide me in this regard whether I can have such windows with sliding doors not making any encroachment?