Halacha states that “from Rosh Chodesh Av, one reduces [activities] associated with joyous building.” This directive to limit construction applies to any building or renovation work that is not essential for the use of the structure, but is instead for purposes of beauty or comfort. However, if the construction is necessary—such as to expand due to an increase in household members or workers, or to repair damages—then it is not prohibited. When the construction or renovation is purely for beauty or added comfort, even if the work has already begun, it must be stopped once Rosh Chodesh Av arrives. If the owner hired non-Jewish workers under a contract to perform the construction or renovation, and halting the work would cause financial loss, or the structure would be harmed by stopping, it is permitted to allow the work to continue.
Renovations of synagogues, yeshivas, Torah schools, kindergartens, or any building intended for public use are allowed—even on the eve of Tisha B’Av. It is also permitted to renovate during these days any building intended for business purposes—such as to sell or rent.
Even on Tisha B’Av itself, there are situations in which construction by a non-Jew can be permitted, particularly when it involves a mitzvah related building. One should consult a Rabbi for guidance in each specific case.
Rabbi Yosef Simcha Ginzberg, translated from Sichat HaShevua
