A construction profile for a window or door frame, the profile manufactured in a plastics material and comprising: - a main body extending in a longitudinal direction X, the main body comprising a hollow body delimited by side walls and compartmented by inner walls; - one fixed and one removable clamping bracket (2, 3), both clamping brackets (2, 3) protruding from said main body in direction Y perpendicular to the longitudinal direction X, and extending parallel to one another and at a distance of one another in the longitudinal direction X; - a pane receiving zone defined by, on the one hand, said clamping brackets (2, 3) and, on the other hand, a surface of said main body, the receiving zone configured to receive a side edge of a pane extending in the X-Y plane to be clamped between said clamping brackets (2, 3), - the fixed clamping bracket comprising a hollow body having at least two side walls (2', 2"), one facing the pane receiving zone and one facing away the pane receiving zone and defining an upper free end portion configured to abut a pane received in the pane receiving zone-and a base portion joining the upper free end portion to the main body, the side wall of the fixed clamping bracket facing away the pane receiving zone extending in a plane parallel to the X-Y plane, the side wall (2") of the fixed clamping bracket facing the pane receiving zone comprising a first section at the upper portion extending in a plane parallel to the X-Y plane and a second section connecting the first section to the surface of the main body defining the pane receiving zone, said second section being straight and extending slantingly inwards the pane receiving zone towards that main body surface; wherein the distance between said side walls (2', 2") of the fixed clamping bracket progressively widens at its base portion from the upper portion towards the main body; wherein the main body comprises at least two inner walls (8, 9) extending from said second section of the side wall (2") of the fixed clamping bracket facing the pane receiving zone such that said inner side walls (8, 9) define a vector in a direction perpendicular to the plane wherein said second section extends, thereby providing support to the second section and helping avoiding deformation of the second section upon load, as such increasing the overall load resistance of the fixed clamping bracket. - a main body extending in a longitudinal direction X, the main body comprising a hollow body delimited by side walls and compartmented by inner walls; - one fixed and one removable clamping bracket (2, 3), both clamping brackets (2, 3) protruding from said main body in direction Y perpendicular to the longitudinal direction X, and extending parallel to one another and at a distance of one another in the longitudinal direction X; - a pane receiving zone defined by, on the one hand, said clamping brackets (2, 3) and, on the other hand, a surface of said main body, the receiving zone configured to receive a side edge of a pane extending in the X-Y plane to be clamped between said clamping brackets (2, 3), - the fixed clamping bracket comprising a hollow body having at least two side walls (2', 2"), one facing the pane receiving zone and one facing away the pane receiving zone and defining an upper free end portion configured to abut a pane received in the pane receiving zone-and a base portion joining the upper free end portion to the main body, the side wall of the fixed clamping bracket facing away the pane receiving zone extending in a plane parallel to the X-Y plane, the side wall (2") of the fixed clamping bracket facing the pane receiving zone comprising a first section at the upper portion extending in a plane parallel to the X-Y plane and a second section connecting the first section to the surface of the main body defining the pane receiving zone, said second section being straight and extending slantingly inwards the pane receiving zone towards that main body surface;