The Washington Post answers a question from a reader on a master bath remodeling project that includes a stained-glass window that is not energy efficient.
Tim Carter writes for the Washington Post that most bathroom windows provide quite a challenge. "Leaks and condensation wreaked havoc inside the walls around and below the windows. The only houses that were immune to such damage were those built of solid masonry — it didn’t seem to matter if water splashed onto the window or condensation dripped down the window seeping into the wall cavity.”
Carter recommends removing the window and instead replacing it with the illusion of one. This can be done by recruiting a tile manufacturer who can take a high-resolution photo and put it on a ceramic tile arrangement to give the wall the illusion of a window. Oftentimes the upkeep for a bathroom window is too much to really make it worth it.
If your client really wants to keep that bathroom window, be upfront with them about the maintenance. To prevent excessive maintenance, Carter suggests creating a special leak-proof flashing to conformed to the window opening, plus leak-proof flashing for the entire bathroom wall.