Below is a step-by-step guide for installing double-Hinged cabinet doors, featuring clear and concise written instructions.

Preparation and Tools

First, gather all necessary tools. You will need double-hinges, a sharp pencil, a combination square or precision ruler, a sharp utility knife, a chisel and mallet, an electric drill and drill bits, a screwdriver, and several wooden wedges or playing cards. Having an assistant during the marking process or using door clamps to secure the cabinet door in place will make the task easier.

Step 1: Mark Hinge Positions on the Door Panel

Lay the cabinet door face down on a flat, protected surface. Determine the hinge mounting locations. The standard practice is to position the top hinge approximately 2 inches below the top edge of the door panel and the bottom hinge approximately 2 inches above the bottom edge. For larger or heavier door panels, a third hinge is recommended at the center. Align the hinge flush with the door edge at the selected position. Using a combination square, lightly score straight pencil lines along the top and bottom edges of the hinge plate—these mark the hinge height.

Next, mark the mortise depth. Lay the hinge flat on the door face, with its flange extending beyond the door edge. Carefully but firmly score the door surface along the hinge plate's side using a utility knife. This score line indicates the precise depth for the mortise. Repeat this process for all hinges.

Step 2: Cut mortise holes in the door panel

This is the critical step for achieving a flush fit. First, lightly tap along the marked lines with a chisel to deepen the knife marks and define the mortise walls. Within the marked rectangular area, cut multiple shallow parallel grooves spaced about 1/4 inch apart. Then, with the chisel bevel facing down, gradually remove excess wood layer by layer. The goal is to create a groove perfectly matching the hinge leaf thickness. Test the hinge fit frequently to ensure it sits flush with the wood surface—neither protruding nor too deep. Repeat this process at all hinge locations on the door.

Step 3: Secure Hinges to the Door Panel

Once the mortises are perfectly cut, position each hinge into its corresponding groove. Use an awl or small nail to precisely mark the center of each screw hole. Remove the hinge and drill pilot holes at the marked points to prevent wood splitting. Finally, securely fasten the hinges to the cabinet door using the matching screws.

Step 4: Position and Mark Cabinet Door Locations

This step ensures perfect alignment. You will transfer hinge positions from the cabinet door to the cabinet frame. With a partner's assistance or using shims and clamps, precisely position the door within the cabinet opening. Use shims or playing cards as spacers to maintain even gaps (typically 1/8 inch) around the door perimeter. Securely hold the door in this ideal position.

Carefully observe where the hinge leaf contacts the cabinet's front frame. Mark the top and bottom positions of each hinge leaf on the frame with a pencil. Next, slightly open the door to identify where the hinge bracket contacts the inner edge of the frame, marking this point. This mark indicates where the frame mortise slot will be cut.

Step 5: Cut the Mortise in the Cabinet Frame

Release the clamps and remove the door. Align the hinge plate against the cabinet front frame and inner edge, matching the pencil markings. Trace the hinge outline onto the frame using a utility knife (same method as for the door panel). Use the same chiseling technique to cut the mortise in the cabinet frame. Note: Frame panels are typically thinner than door panels. Mortise depth is critical for ensuring operational clearance.

Step 6: Hang and Adjust the Door Panel

Secure the hinge leaves to the cabinet frame with screws. Lift the door panel and carefully align the two hinge halves. Insert the hinge pins and gently tap them into place. The door panel is now hung. Test the opening and closing action; it should operate smoothly without sticking.

Final Adjustments: If the door sags or has uneven gaps, make adjustments. Slightly loosen the screws on the cabinet frame side (do not remove completely). This typically allows minor adjustments to the door's vertical and horizontal position. Then tighten the screws to correct alignment. If the door sticks on the hinge side, insert a thin cardboard shim behind the tongue slot of the hinge leaf to create a slight outward curve.

The key to a professional finish lies in patience during marking and mortising. Use sharp tools and work meticulously to ensure a flat, precise fit—this is what makes your DIY cabinet doors glide as smoothly as silk.