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May one move houses during Sefira?
Some[1] write that one should abstain from moving during the period of Sefira.[2] Accordingly, if one must move during this time, it is best to do so on Rosh Chodesh or on Lag BaOmer.[3] Others[4] however rule that no restrictions exist at all regarding moving during Sefira and it may be thus done on any day.
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[1] Avneiy Tzedek Yoreh Deah 44; Beis Mordechai 30; Poskim in Piskeiy Teshuvos 493:1 footnote 1 and Nitei Gavriel 55:5 footnote 10
[2] The reason: As moving houses involves joy, as can be seen from the custom of Chanukas Habayis, and [according to some] of making Shehechiyanu. [ibid]
[3] Avnei Tzedek ibid; Alternatively, one can place Mezuzos on the door of the house prior to Pesach and then move in whenever he desires. [Beis Mordechai ibid]
[4] Yechaveh Daas 3:30, Tzitz Eliezer 11:41; Piskeiy Teshuvos ibid footnote 6; Nitei Gavriel ibid footnote 9