Directly Through Glass (Requires Glazier)

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Yes, You Can Install a Pet Door Directly 'Through the Glass'

of your sliding glass door or window, sidelight or French door. While there are alternatives for most of these--you can purchase a patio pet door for your sliding glass door or undersized for your sliding window. And you can purchase a sash window pet door for your sash (up & down) window-the 'in glass' approach is less obtrusive, cleaner and neater. It's also more expensive and more trouble. So you make the decision between aesthetics, cost and convenience.

Here are a few tips we think important:

  1. Use a Glazier - The glass in your slider, window or sidelight is going to be tempered and you can't cut that. The glazier will measure your glass, order a new piece--either single pane or dual--with a cut-out for the pet door and install it for you.  This is Not a do-it-yourself job!
  2. If You've Got a French Door with Separate 'Lites' - You're in the wrong section. Remove one or more lites, cut down into the cross-piece if you must to make the step-over more manageable for your pet and order a custom dimension pet door to fit that opening. There's only one--Hale Custom for Doors--and on that product page you'll see an image of exactly what we're talking about here.. PS - Make really sure those are separate lites and not one big sheet of glass with moulding making it look like separate lites!

    hale custom pet doors for french doors with panes

  3. OK. You Can DIY and Here's How - Forget glass. You're going to use a piece of Lexan (generic name polycarbonate) cut to replace your glass and then cut a hole for a pet door in the polycarbonate. But note:
    1. The polycarbonate needs to be at least 3/16" thick or it's too bendy.
    2. Polycarbonate will scratch more easily than glass so this isn't good for a location, like a slider, that may receive some abuse.
    3. It's expensive as well so a window that isn't so large is a better choice than that big picture window.
    4. You can use a pet door designed to install in a door but if it's self-framing, and most are these days--be sure the thickness of your polycarbonate is in the adjustment range.
    5. If you want to go on the cheap, use plywood.