It is easy to replace a doorknob with a lever door handle. The hardware is available at all home improvement centers.
Step 1 – Start Replacing Door Handle Assembly
First, take out the old door handle assembly by unscrewing the two screws that secure the assembly's faceplate to the door. Turn each screw several times apiece, alternating to stop one screw from binding by being removed further than the other one.
Step 2 – Remove the Latch Mechanism
Take out two screws setting in the door edge and slide the latch mechanism out. If the latch mechanism is stuck, put a screwdriver into the latch hole. Place light pressure on the latch mechanism the latch plate will unsettle. The rest of the latch unit will come out.
Step 3 – Put New Latch Mechanism In
Put the new latch assembly in the old latch hole. The flat surface of the latch should be on the interior side of the door. If the new latch mechanism is longer than the old one, drill about 1/2 inch in. Normally, 1/2 inch is sufficient. If the new latch plate is bigger than the old one, cut a mark around the edge of the plate’s edge using the utility knife. Then trim using a utility knife.
Step 4 – Install Lever Assembly
Put the new lever assembly in place. Screw the screws into the holes. Gently close the door checking if the latch hits the strike plate in the same place. If not, take off the strike plate. Drill into the receiver hole. With utility knife mark new spot for strike plate and trim. Drill new openings and install.