Measure diagonally from corner to corner. If the two diagonal numbers differ by more than 1/4", your frame is "out of square," and you should consult the supplier before ordering. 💎 Step 2: Choose the Right Glass Type
Accurate measurements are the most critical part of ordering online, as custom-cut glass is typically non-refundable. buy window glass online
Standard residential windows often require specialized glass based on safety codes and energy needs: Measure diagonally from corner to corner
Many pros recommend subtracting 1/8" (about 3mm) from your final width and height to provide "fitting tolerance" so the glass isn't too tight to install. your frame is "out of square
Record the smallest of your three width and height measurements to ensure the new pane will fit into the frame.