Abstract: A prefabricated finishing module for the construction of building constructions provided with at least one pair of panels facing one another, bounding a space for the casting of concrete, adapted to be connected to one another and to respective panels of adjacent modules and each bounded by first edges opposite one another and by second edges opposite one another and extending between respective ends of the first edges. The module is characterized in that the first edges of each panel have respective first longitudinal grooves aligned with one another and in that the second edges have respective second longitudinal grooves aligned with one another, intersecting the first grooves and transversely offset with respect to first grooves; the first and second grooves are engaged in use, at least in part, by respective first and second anchors adapted to connect the module to adjacent modules intersecting one another reciprocally.