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
This is often the best choice for custom sizes and specialized glass types (like tempered or frosted). They can cut single-pane glass to your exact dimensions while you wait and offer professional advice on DIY installation. 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 They can cut single-pane glass to your exact
Are you looking to replace a in an old wood frame, or are you dealing with a foggy double-pane vinyl window?
Sites like One Day Glass or Dulles Glass are excellent for ordering custom-cut Insulated Glass Units (IGUs)—the double-pane "sandwiches" used in modern windows—which are difficult to find at local hardware stores.
If your window is foggy or has condensation between the panes, you cannot simply clean it; the entire insulated unit must be replaced.