There is no such thing as a "common law marriage" in the Dominican Republic. Living together is never equivalent to a normal marriage.
However, certain provisions in the Labor Code, the Minors Code and the Criminal Code acknowledge that living together has legal consequences. For example, a worker has the right to a few days off work if his or her companion gives birth to his child; domestic violence to a companion treated the same as domestic violence to a wife. On October 17, 2001, a Supreme Court decision gave a surviving concubine the right to sue for the wrongful death of her companion in an automobile accident under very restrictive conditions: a) the couple must have lived as if they were husband and wife, in a public relationship, not hidden or secret; b) the relationship must be stable and long-lasting; c) the relationship must be monogamous and non-adulterous since its origins ; and d) the couple should be of different sexes. The ruling goes on to say expressly that "marriage and extra matrimonial companionship are not . . equivalent realities?.
Other courts have expanded these rights to other areas but are in the process of appeals. A bill has also been introduced in Congress to create common law marriages. I doubt it will pass since the Catholic Church is dead set against it.