I have a small bathroom with no window, and plan to insert a 400mm W x 300mm H double glazed hard timber framed window. The window will be in the middle of a large exterior cavity wall. I plan to add one row of decorative bricks above the window to match the other windows.
Casual opinion is that the window can just slot in, with cavity moisture drainage protection as described on this site.
Q. I do not want to make a much larger hole to put in a lintel if I can avoid it, and if the wall WILL take it. What do you advise, Please?