R' Yehudah Hachassid advises against blocking up a window. What about blocking a doorway between two rooms?
Answer:
Although it does apply to external doorways, the instruction of R' Yehudah Hachassid would not appear to apply to a doorway between two rooms.
Sources: Bris Olam, p. 363, citing from Rav Shlomo Zalman Auerbach (Rav Auerbach added that the instruction, for tohse who wish to abide by it (he stated that this was not a halachah), applies even when there are two or more windows or doorways along a single wall).
