First, bend back the tabs that hold the existing glass panes. Then cautiously slide out each pane of glass (Image 1).
Next, unscrew the frame using a cordless drill making sure to add a little extra pressure to make sure each screw comes out clean. Then, score through any coats of paint that are holding the frame in place using a utility knife (Image 2).
Remove the frame from place by tapping it lightly using a block of wood and a hammer (Image 3).
Next, create a new frame using quarter round. Measure and cut to size.
Then, sand down the window frame. Before nailing the quarter round in place pre-drill holes to prevent the wood from splitting on the way down.
Once the frame is installed on one side of the door, place the pre-cut glass in place.
Finish by installing another quarter-round frame on the interior of the door.
To complete the look, all that’s left to do is paint the trim and clean the glass.