Hinge assembly for household appliances having an horizontally-pivoted front door, and which comprises: - a first coupling element structured for being firmly fixed to the household appliance casing; - a second coupling element structured for being firmly fixed to the front-door body, and which is pivotally jointed to the first coupling element so as to be able to rotate about a given articulation axis, between a first working position wherein the front door is arranged in the raised position, and a second working position wherein the front door is arranged in the completely lowered position; and - a door-weight balancing device which is interposed between the first and the second coupling element and is structured to elastically hamper rotation of the second coupling element at least from the first to the second working position; the door-weight balancing device in turn comprising a supporting rod which extends in sliding manner through a supporting portion of the first coupling element, a compression-preloaded elastically-deformable member which is fitted to the supporting rod so as to have a first end fixed to the distal end of the supporting rod and a second end acting on the supporting portion of the first coupling element, and a linking mechanism which connects the proximal end of the supporting rod to the second coupling element, so that the supporting rod is axially moved to further compress the elastically-deformable member when the second coupling element rotates from the first to the second working position; whereby the door-weight balancing device also comprises an adjustable spacer element which is interposed between the second end of the elastically-deformable member and the supporting portion of the first coupling element, and which is structured so to allow a manually-operated adjustment, between a lower value and a higher value, of the distance (h) between the second end of the elastically-deformable member and the supporting portion of the first coupling element, thus varying the compression preload of the elastically-deformable member fitted on the supporting rod, characterized in that the adjustable spacer element comprises two substantially wedge-shaped blocks (20, 21) which are piled up roughly aligned to the longitudinal axis of the supporting rod, and are fitted to the supporting rod between the second end of the elastically-deformable member and the supporting portion of the first coupling element; the two substantially wedge-shaped blocks (20, 21) being additionally structured so to be able to move one onto the other along a given travelling direction (d) having a vectorial component parallel to the longitudinal axis of the supporting rod, so that any reciprocal movement of the two substantially wedge-shaped blocks (20, 21) causes a variation of the distance (h) between the second end of the elastically-deformable member and the supporting portion of the first coupling element, whereby the adjustable spacer element is also provided with manually-operated adjusting means which are structured so to both prevent any undesired reciprocal movement of the two substantially wedge-shaped blocks (20, 21), and to selectively move the two substantially wedge-shaped blocks (20, 21) one with respect to the other along said travelling direction (d), whereby the manually-operated adjusting means consists of a connecting screw which is fixed in axially rotating manner to the first coupling element, beside one of the two substantially wedge-shaped blocks (20, 21), and extends towards said substantially wedge-shaped block (20, 21) up to reach and screw into the body of said wedge-shaped block (20, 21), so that any rotation of the connecting screw causes a reciprocal movement of the two substantially wedge-shaped blocks (20, 21) along said travelling direction (d). - a first coupling element structured for being firmly fixed to the household appliance casing; - a second coupling element structured for being firmly fixed to the front-door body, and which is pivotally jointed to the first coupling element so as to be able to rotate about a given articulation axis, between a first working position wherein the front door is arranged in the raised position, and a second working position wherein the front door is arranged in the completely lowered position; and - a door-weight balancing device which is interposed between the first and the second coupling element and is structured to elastically hamper rotation of the second coupling element at least from the first to the second working position;