The present invention relates to a covering structure (10) intended on the one hand to accommodate a door, in particular an interior door and on the other hand to be assembled with a partition, which structure comprises: - two side walls (11, 12 ) facing each other spaced apart by a thickness (e1), said thickness being adjusted with respect to the thickness (e2) of the partition so that said side walls form an outer surface flush with the outer surface of the partition when the structure is assembled with the partition; - a transverse end wall (13) connecting the two side walls; - said transverse end wall (13) comprising a flat surface (14) configured to border the thickness of a vertical edge of the door and a projecting element (15) forming a bearing surface for the door; - Said walls being formed from at least one composite panel, said panel comprising a central layer (20) sandwiched between two facing layers (18, 19).
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