A construction method using cardboard-based construction elements, said elements including: - a height, a width and a thickness, and are formed, in the direction of the thickness, of an alternation of one or several flat cardboard sheets (2, 3) with one or several laminated corrugated cardboard sheets, and - in their thicknesses and extending in the direction of the height and/or the width, at least one structuring stiffener, - on at least two of its opposite edges (9, 10), each element includes at least one encasement rabbet intended to cooperate, through encasement, with an adjacent construction element, the construction method being characterized in that: - on a foundation sole or a slab is arranged a U-shaped structure foot shoe; - into this foot shoe and according to a vertical arrangement are encased the construction elements, while all or part of these construction elements are laterally encased into each other by their encasement rabbet; - said construction elements are capped by means of a head shoe; - on the foot shoe and/or the head shoe are fixed the ends of I-shaped wooden beams of a structure of a floor; - between two I-shaped beams is arranged a panel resting on the lower setback defined by the lower horizontal wing relative to the vertical core of such an I-shaped beam; - on this panel are placed one or several cardboard modules consisting of an alternation of one or several flat cardboard sheets (2, 3) with one or several laminated corrugated cardboard sheets; - with an adapted adjustment cardboard element is completed the gap preserved between a cardboard module and the vertical core of an I-shaped beam. - a height, a width and a thickness, and are formed, in the direction of the thickness, of an alternation of one or several flat cardboard sheets (2, 3) with one or several laminated corrugated cardboard sheets, and - in their thicknesses and extending in the direction of the height and/or the width, at least one structuring stiffener, - on at least two of its opposite edges (9, 10), each element includes at least one encasement rabbet intended to cooperate, through encasement, with an adjacent construction element, the construction method being characterized in that: - on a foundation sole or a slab is arranged a U-shaped structure foot shoe; - into this foot shoe and according to a vertical arrangement are encased the construction elements, while all or part of these construction elements are laterally encased into each other by their encasement rabbet; - said construction elements are capped by means of a head shoe; - on the foot shoe and/or the head shoe are fixed the ends of I-shaped wooden beams of a structure of a floor; - between two I-shaped beams is arranged a panel resting on the lower setback defined by the lower horizontal wing relative to the vertical core of such an I-shaped beam; - on this panel are placed one or several cardboard modules consisting of an alternation of one or several flat cardboard sheets (2, 3) with one or several laminated corrugated cardboard sheets; - with an adapted adjustment cardboard element is completed the gap preserved between a cardboard module and the vertical core of an I-shaped beam. - on a foundation sole or a slab is arranged a U-shaped structure foot shoe; - into this foot shoe and according to a vertical arrangement are encased the construction elements, while all or part of these construction elements are laterally encased into each other by their encasement rabbet; - said construction elements are capped by means of a head shoe; - on the foot shoe and/or the head shoe are fixed the ends of I-shaped wooden beams of a structure of a floor; - between two I-shaped beams is arranged a panel resting on the lower setback defined by the lower horizontal wing relative to the vertical core of such an I-shaped beam; - on this panel are placed one or several cardboard modules consisting of an alternation of one or several flat cardboard sheets (2, 3) with one or several laminated corrugated cardboard sheets; - with an adapted adjustment cardboard element is completed the gap preserved between a cardboard module and the vertical core of an I-shaped beam.