Everyone obsesses over width, but height is the trickster. A standard sliding glass door rough opening height is typically 80 to 82 inches. That’s fine for most people, until you try to bring in a tall grandfather clock or a standing lamp.
What Is The Standard Size Of A Sliding Gl Door - Infoupdate.org
But here’s the curveball: if your home has a low header—say, 80 inches—your unit might actually be a narrower "garden door" style. Always measure from the floor to the top of the frame, not the drywall. The drywall lies like a cheap politician.
