A furnishing assembly, for example a table or raised shelf, comprising: i) at least one panel which comprises free panel edges (21, 22, 23, 24); ii) a support structure which comprises: - at least two extruded profiles, wherein each profile comprises two longitudinal ends (38, 39) and perimeter walls defining a central cavity, wherein, for at least one profile (38, 39), said perimeter walls comprise: • a first wall which engages the at least one panel; • a second wall incident on the first wall forming an internal profile corner; • a prevalently planar third wall, incident both on the first wall and on the second wall, wherein the third wall forms a first external profile corner with the first wall, wherein said first external profile corner is positioned at a free panel edge (21, 22, 23, 24); - a connection group housed in one or both central cavities, connected to two profiles at respective longitudinal edges (38, 39), so that said profiles extend incident to each other; wherein the support structure further comprises: - at least one stiffening device which extends outside the central cavity incident to the second wall of a profile; - body connection means which engage said second wall at the first internal profile corner, connecting said stiffening device to said profile; wherein the furnishing assembly is characterized in that it comprises at least one auxiliary cover panel which engages at least one profile in a distal position from the first wall and defines a mounting chamber with the panel, and in that the at least one stiffening device is housed in said mounting chamber. i) at least one panel which comprises free panel edges (21, 22, 23, 24); ii) a support structure which comprises: - at least two extruded profiles, wherein each profile comprises two longitudinal ends (38, 39) and perimeter walls defining a central cavity, wherein, for at least one profile (38, 39), said perimeter walls comprise: • a first wall which engages the at least one panel; • a second wall incident on the first wall forming an internal profile corner; • a prevalently planar third wall, incident both on the first wall and on the second wall, wherein the third wall forms a first external profile corner with the first wall, wherein said first external profile corner is positioned at a free panel edge (21, 22, 23, 24); - a connection group housed in one or both central cavities, connected to two profiles at respective longitudinal edges (38, 39), so that said profiles extend incident to each other; - at least two extruded profiles, wherein each profile comprises two longitudinal ends (38, 39) and perimeter walls defining a central cavity, wherein, for at least one profile (38, 39), said perimeter walls comprise: • a first wall which engages the at least one panel; • a second wall incident on the first wall forming an internal profile corner; • a prevalently planar third wall, incident both on the first wall and on the second wall, wherein the third wall forms a first external profile corner with the first wall, wherein said first external profile corner is positioned at a free panel edge (21, 22, 23, 24); • a first wall which engages the at least one panel; • a second wall incident on the first wall forming an internal profile corner; • a prevalently planar third wall, incident both on the first wall and on the second wall, wherein the third wall forms a first external profile corner with the first wall, wherein said first external profile corner is positioned at a free panel edge (21, 22, 23, 24); - a connection group housed in one or both central cavities, connected to two profiles at respective longitudinal edges (38, 39), so that said profiles extend incident to each other; wherein the support structure further comprises: - at least one stiffening device which extends outside the central cavity incident to the second wall of a profile; - body connection means which engage said second wall at the first internal profile corner, connecting said stiffening device to said profile; - at least one stiffening device which extends outside the central cavity incident to the second wall of a profile; - body connection means which engage said second wall at the first internal profile corner, connecting said stiffening device to said profile; wherein the furnishing assembly is characterized in that it comprises at least one auxiliary cover panel which engages at least one profile in a distal position from the first wall and defines a mounting chamber with the panel, and in that the at least one stiffening device is housed in said mounting chamber.