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Question DetailsAsked on 7/18/2015

Just got a quote of $980 to replace pane of glass in double pane patio door. Unreasonable?

The glass measures 75 3/4 inches by 33 3/4 inches. It would be a single lane of the double lane window, the exterior pane shattered but not the interior.

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1 Answer


Since a double-pane, undoubtedly with inert gas between them for moisture control and better insulating performance, the entire "glazing unit" - the two panes of glass and the encapsulating seal (almost always aluminum) has to be removed and replaced - replacing just the outer pane (if you could) would leave mosit air in between which would cause fogging, plus during heating and cooling cycles it would pull more moisture in and eventually you would have water running down the inside of the glass in cooling weather.

Unless the glass replacement company makes their own glazing units (rare), there would be no way of incorporating the good pane in the new unit - assuming it is not scratched or nicked, which a replacement glass company would not put in a new unit.

So - you are paying for them to come out and measure the window, get a new double-pane glazing unit made up and shipped (and because it has to be shatter-resistant safety glass, is pricey and heavy and riskier to transport), then remove the old one and put new one in.

Cheapest I have heard of for materials and labor to replace that general size double-pane window is $600 range for a locally-available same-manufacturer factory-made unit, and commonly in the $1000 ballpark for low-E or Therma-Pane or UV-filtering or tinted or similar special treatment units, or for ones that have to be special made by a glass distributor.

You could always call another window or glass replacement company for a second quote - just be sure they are both quoting the same glass and any special treatment or special gas types (argon versus ntirogen filled are significantly different price, for instance), and of course required by law to be safety glass.

Answered 4 years ago by LCD

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