The invention relates to a prefabricated construction component for wooden architectures comprising at least one panel-shaped portion (23) and at least one panel support component (212) attached to the panel, and made of a single piece of high-density wood by means of a moulding or extrusion type production process, enabling a quick assembly particularly by means of a plurality of support components forming ribs constituting side strips (212) each connected to a lower crossbeam (213) and an upper crossbeam (221), the prefabricated component (2) constituting a wall being closed at least partially by the panel (23), the prefabricated component resting on its lower crossbeam, the upper crossbeam, supported by side strips, being at a height corresponding to a floor-to-ceiling height.
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