It costs between $45 to 70k USD to add a private bomb shelter to a building two stories or less.
Currently, around 70% of Jewish Israelis have access to a bomb shelter, and about 50% of non-Jewish Israelis have access.
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Source: https://www.timesofisrael.com/after-seeing-iran-war-damage-israelis-weigh-costs-of-adding-private-shelters/