Minecraft wiki entry for Defeating_a_woodland_mansion, associated text: Since the mansion is in a dark forest, you can make a giant basement and carve windows into a cobblestone foundation that is taller than one mansion level (roughly around ten blocks, but you can make it as tall as you want). The first floor doesn't have windows since the trees around obstruct it, but you can carve windows into it. The dark oak wood from the trees around it blends nicely with the rest of the mansion. You can also chop down trees around and use the logs to expand the mansion to that area too.