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

Buying window glass online allows you to skip the showroom and order custom-cut panes directly to your door. Most retailers provide instant online quotes based on your specific dimensions and glass type. 🛠️ Step 1: Measure for a Perfect Fit

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.

Accurate measurements are the most critical part of ordering online, as custom-cut glass is typically non-refundable.

Standard residential windows often require specialized glass based on safety codes and energy needs:

Measure the width at the top, middle, and bottom. Then, measure the height at the left, center, and right.