==Leaving one's home unfinished==
# The Rabbis established that after the destruction of the temple it is forbidden to build a house that's completely plastered like palaces of kings rather one should coat it with lime and plaster and leave an Amah by Amah area unfinished adjacent to the doorway. <ref> Gemara Bava Batra 60b details the rabbinic institutions that Chazal made as a commemeration of the Churban. One of the laws was that it was forbidden to build a sturdy house like a palace. Another institution was to leave an Amah By Amah of the house unfinished. Such is the opinion of the Rambam (Hilchot Tanit) and Shulchan Aruch 560:1. </ref> However, the Minhag is to be lenient and permit any type of structure as long as there is an Amah by Amah left unfinished. <ref> Darkei Moshe says that the Minhag is to be lenient in this regard like the opinion of the Tur.
Magan Avraham 560:1, Mishna Brurah 560:1 and Kaf HaChaim 560:3 concur. </ref>
# Many in Klal Yisrael are unaware of this halacha and have their house completely finished. Some lament the Minhag and some defend the Minhag. <ref> Shaarei Teshuva laments the fact that so many are unaware of this law and don't abide by it. Aruch HaShulchan defends the lenient practice considering the fact that the first Beraita in the gemara holds that if the building is made out of a mixture of sand in the lime/cement there is no requirement to leave an Amah by Amah unfinished. Kaf HaChaim 560:11 concurs. Aruch HaShulchan argues that the second Braitta which is quoted as halacha by the Rif, Rosh, Rambam, and Shulchan Aruch agrees with that idea that for a mixture it's permissible. The Aruch HaShulchan brings support from the Nemukei Yosef and Ran and leaves it as a Tzarich Iyun why Shulchan Aruch didn't mention this leniency. </ref>
# If the house is bought one doesn't need to change the structure to leave an Amah by Amah unfinished. <ref> Shulchan Aruch 560:1 </ref>