Minecraft wiki entry for Adding_beauty_to_constructions, associated text: Appearance wise, many would suggest 4-5 blocks high as a small room, so remember that your house should have varied room ceilings. For example, a living room in a medieval house would usually reach to 5-6 blocks high, while dining halls in a medival castle would reach up 10-12 blocks high, with the rooms reaching a mere 4-5 blocks tall. Your color palette should be used in the roof, as with the rest of your house. This means that for a house made of mainly oak and spruce planks, acacia planks for a ceiling would not fit.