When measuring for a replacement, measure the opening and subtract about 1/8 inch from both the width and height to allow for expansion and easy fit.
Finding the right place to buy window panes depends on whether you need a quick DIY fix for a single-pane window or a high-performance replacement for modern double-pane units. Best Places to Buy Window Panes where to buy window panes
If you have double-pane windows, look for a metal or foam spacer between the glass. You will need to match its thickness (usually 1/2" or 7/8") to ensure the new unit fits your frame. When measuring for a replacement, measure the opening
Often the most convenient spot for small, single-pane repairs. They typically stock standard glass sizes and the glazing putty or points needed for the job. Choosing the Right Type of Glass Glass Type Best Use Case Key Benefit Annealed (Standard) Older single-pane windows Most affordable and easiest to cut. Tempered (Safety) Doors or low-to-ground windows Crumbles into dull cubes instead of shards if broken. Low-E (Low Emissivity) Energy-efficient modern homes You will need to match its thickness (usually