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Question DetailsAsked on 10/8/2016

What is tbe average price to replace a double pane bedroom window. Approx 24wx48L. only ned one pane replaced

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Normal double-pane units (as opposed to impact-resistant outer pane and normal inner pane storm windows) have an inert gas between them (usually a "Noble" gas like argon which has low thermal conductivity) - so the two panes of glass are built as a sealed unit with an outer frame around them - almost always aluminum frame pressure crimped around the glass with a sealer, which you can see if you look through the inner pane at the edge of the glass pieces - aluminum frame will show (commonly with a bit of squeezed-out sealer or gasket inside here and there) all around the edges of the glass. When sealed units like this are replaced, they use all new glass in almost all cases, and certainly for your size window - because they don't want to risk a failure due to scratches in the old glass, the old glass will be stained, and cheaper to use new glass than disassemble the old unit (which might well break the glass anyway) and clean it up for reuse - plus they don't want to warranty a unit with used materials. Also, would mean having to shipp the old glass to the facility that makes the double pane unit (most glass replacement companies buy sealed/multilayer glazing units from a specialty fabircator) - so all around, just makes sense to use all new materials. [Sometimes but fairly rarely existing glass is reused on very large windows or on large ones with special expensive coatings, like on highrises and large commercial windows].

Depending on whether your glazing unit (the glass and sealing frame combined unit) is designed to come out of the window directly (usually is) or the window unit needs partial disassembly (commonly only with aluminum windows), the rates I have seen recently for that rough size is about $300- in my area for direct-replace (replace without taking window unit apart though if an opening window will usually take that out to work on it rather than try to replace from outside the house) with normal double-pane glazing - $400 range with thermal reflective or ultraviolet protective glass or for triple-pane unit. (Normal triple-pane unit is two panes of glass plus almost invisible treated plastic film stretched very tight between them - if triple- pane the metal glazing frame will have what looks like a seam or cut all around it in the middle of it between the two panes of glass rather than being continuous metal from pane to pane, and the plastic sheet likely will have water drip traces and possibly mineral or corrosion buildup near the bottom at least - or if fogging up, commonly the fogging/condensation can be seen to be occurring on that middle sheet. At first glance, without looking close, many triple-pane (2 glass + plastic film instead of true 3-glass layer triple pane) windows look like double pane.

True triple pane (3 layers of glass) or double-pane with high-end energy efficient coatings glazing unit replacement commonly runs in the $400-500 range for that size in my area - higher cost area but not extreme.

If you happened to mean you want to replace the double or triple-pane glazing unit with just a single sheet of glass, probably in the $200-250 range under normal conditions assuming unit does not have to be disassembled to do it.

These prices of course assume decent access to the window - not over 2 stories high, accessible by ladder from outside or damaged unit is removeable (if an operating/opening window), and that the glazing unit is designed to be removed. There are some cheap (and also a couple of extremely high-end extreme efficiency) windows out there where the glazing unit (glass) is molded into the plastic or fiberglass frame during manufacture and cannot be replaced- you have to replacde the window unit.

Your Search the List category for this would normally be Glass and Mirrors - though some Window distributors do glazing unit replacements as well.

IF this is an operating unit - so removeable - you might save $50 or so taking it out and to the shop yourself, but commonly a week or so for multi-pane replacement glazing units to be fabricated and delivered, so you would have to make the window watertight in the interim - usually just easier to have them do it all. They can plastic sheet the window for water-tightness (if outer glass is actually broken) till the new unit comes in to be installed, so old window will stay in place until then - they will just measure for replacement unit and come back when it is received and ready to install.

Depending on unit and how picky you are, you may then need a Handyman or Painter to come a week or more later to paint the caulk around the new glazing unit - because there will be a 1/4" or so bead of caulk all around it. Some installers only carry clear or white caulk, the really conscientious ones also stock it in milk chocolate brown, ivory, and black so ask about that is you desire a certain color (those are the commonly available colors without going to a specialty supplier).

Answered 4 years ago by LCD

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