Procedure for the manufacture of compact modules for the construction of rectangular prismatic modules of reinforced concrete with openings corresponding to doors and windows the following operative phases being established in it: - Construction in the factory of an internal formwork based on at least six constituent elements consisting of a bottom base, a top base and four lateral walls (3, 4, 5 and 6). - Mounting the integral elements of the said internal formwork, configuring a rectangular prismatic block in which the different elements are fixed between each other. - Mounting an external structured formwork consisting of four elements, each one of them overlapping with one of its ends the adjacent element, so that its distance from the internal formwork is adjustable as desired, supporting these elements of the recoverable external formwork on the floor, or on the horizontal platform established on it and sticking out, substantially with respect to the said internal permanent formwork with its top edge. - Filling the perimetrical space defined between the two formworks with liquid concrete. - After the concrete hardens, the recyclable external formwork is removed. The procedure being characterised in that: a) The internal formwork is a permanent formwork. b) The elements of the internal permanent formwork are fixed between each other by means of high-resistance putty supporting the said prismatic block directly on the ground or on a horizontal platform, by means of the distancing elements in the bottom face of the also bottom element. c) Collocation on the outside face of the internal permanent formwork of the necessary electrical, telephone, drainage, plumbing and other installations. d) Collocation or depositing of the insulation material on the outside of the preceding structure on the external walls that require it. e) Collocation also on the outside of the internal permanent formwork of a duly calculated protective framework. f) The liquid concrete fills up also the space defined between the internal formwork and the ground, as well as the area above the said internal formwork to configure a superior structure. - Construction in the factory of an internal formwork based on at least six constituent elements consisting of a bottom base, a top base and four lateral walls (3, 4, 5 and 6). - Mounting the integral elements of the said internal formwork, configuring a rectangular prismatic block in which the different elements are fixed between each other. - Mounting an external structured formwork consisting of four elements, each one of them overlapping with one of its ends the adjacent element, so that its distance from the internal formwork is adjustable as desired, supporting these elements of the recoverable external formwork on the floor, or on the horizontal platform established on it and sticking out, substantially with respect to the said internal permanent formwork with its top edge. - Filling the perimetrical space defined between the two formworks with liquid concrete. - After the concrete hardens, the recyclable external formwork is removed. a) The internal formwork is a permanent formwork. b) The elements of the internal permanent formwork are fixed between each other by means of high-resistance putty supporting the said prismatic block directly on the ground or on a horizontal platform, by means of the distancing elements in the bottom face of the also bottom element. c) Collocation on the outside face of the internal permanent formwork of the necessary electrical, telephone, drainage, plumbing and other installations. d) Collocation or depositing of the insulation material on the outside of the preceding structure on the external walls that require it. e) Collocation also on the outside of the internal permanent formwork of a duly calculated protective framework. f) The liquid concrete fills up also the space defined between the internal formwork and the ground, as well as the area above the said internal formwork to configure a superior structure.