Why were medieval houses windows so small?
When you have an opening like a door or window they leak, are drafty, and don’t fit well in the building materials used in this time. Also in some places people were taxed for each window. This was done in Ireland for many years. Just trying to stay dry and warm was a challenge let alone have a lot of windows that added to the areas where they would get a draft or two. Just wasn’t worth it to have big windows or a lot of them.