Double Pane Window Repair
A cracked double pane looks like a window problem and prices like one too — until you learn the glass is a sealed, swappable unit. We repair double pane windows by replacing that unit, at about 80% less than a new window.
replacement
Before
AfterA crack in the glass is not
a verdict on the window.
Double pane windows fail in two distinct ways, and New Jersey homeowners get quoted the same wrong answer for both. The slow failure is the fogged seal — covered in depth on our foggy glass page. This page is about the sudden one: the lacrosse ball, the storm-flung branch, the pebble from the mower, the long diagonal thermal crack that appeared one frigid morning. A broken double pane feels more serious than a broken single pane — two layers, sealed gas, coatings — and replacement companies lean into that feeling. The truth runs the other way: because double-pane glass is manufactured as a self-contained sealed unit, it's arguably the most cleanly replaceable glass in your house.
What a broken double pane is quietly costing you
The moment either pane cracks, the unit stops being a thermal device. The argon bleeds out through the breach, moisture migrates into the cavity, and the insulating value collapses toward single-pane territory — right where you feel it, since the coldest drafts sit next to the largest glass. Left through a winter, cavity moisture fogs and mineral-stains the intact pane too. None of this urgency argues for a new window; it argues for a prompt double pane glass replacement, which restores the full sealed-cavity performance in one glazing visit.
Why "repair" means "unit swap" — an honest note
You'll see "double pane window seal repair" advertised as if the seal itself can be mended in place. It can't — not to factory standard. The seal, spacer, desiccant, and panes are laminated into one part on a production line, and the field version of "resealing" is a caulk line over a fatigued system. We repair the window by replacing the unit: made to your exact dimensions, matched or upgraded in spec, glazed into the sash you already own. That's the version of repair we can put a 5-year workmanship warranty behind — and the reason our Google rating stands at 5.0. If the sash around the glass turns out to be the real problem, we say so and price the sash work honestly instead.
Double pane repair for Montclair, Glen Ridge, Millburn, Summit, Chatham, Livingston, Wayne & Westfield · fully insured · West Caldwell, NJ · Mon–Fri 8:00 AM – 6:00 PM · (973) 564-0958
Per opening, installed — the reflex quote for a cracked double pane, though the crack lives in replaceable glass.
Frame demolition included, needlesslyA new sealed double-pane unit, made to size and glazed into your sash — insulation restored, backed by a 5-year workmanship warranty.
Same window, full thermal performanceCrack, fog, or draft —
the road to fixed is the same.
Send the evidence
Photo of the crack or haze, plus rough size. Same-day confirmation that it's a unit swap, with a range.
Same dayMeasure, secure, order
Exact dimensions and spec taken onsite; a cracked unit is stabilized so it's safe while the new one is made.
Within 1–2 daysInstall the new unit
Old unit out, new sealed unit glazed in, stops and gaskets reset. The window insulates like it did on day one.
1–2 weeksPrefer to talk first? Call (973) 564-0958 — Mon–Fri, 8 AM–6 PM.
Two panes, one seal —
and all the questions in between.
One pane of my double pane window is cracked. Do both panes get replaced?
Both — but only the glass, never the window. A double-pane unit is manufactured as one sealed part; the two panes and the spacer between them can't be separated and re-sealed in the field to factory standard. So a crack in either pane means the sealed unit is replaced as a whole, made new to your exact dimensions. The sash, frame, and hardware stay exactly where they are.
The outer pane broke but the inner one is fine. Is the window still insulating?
No — the moment either pane cracks, the sealed cavity is open to the atmosphere. The argon fill escapes, moisture enters, and the unit becomes, thermally, little better than a single pane with a storm sash. It's also a progressing failure: water in the cavity fogs and stains the surviving glass. It's worth scheduling promptly, though it's rarely an emergency if the glass is holding — we'll tell you which case yours is from the photo, the same day.
When is it repair, and when is it full window replacement?
Our decision rule is about the wood and the fit, not the glass. If the sash and frame are sound — which they almost always are — a broken or fogged double pane is a glass-unit swap, full stop. Replacement enters the conversation only when the window around the glass is structurally failing: rot through the joints, a racked frame, a sash too far gone to rebuild economically. Even then you'll see both prices in writing first; our honest take on that boundary lives on the window replacement page.
How much does double pane glass replacement cost?
Per unit, it tracks glass area and spec — standard window sizes are a low-hundreds repair, larger and tempered units more. The number to compare it against is the four-figure installed cost of the replacement window that same crack usually gets quoted as; the gap lands around the 80%-less mark that runs through all our work. Estimates are free and itemize the unit spec so you can compare quotes apples-to-apples.
Can I upgrade the glass while it's being replaced?
Yes, and it's the cheapest moment you'll ever have to do it. Because each unit is custom-manufactured anyway, stepping up to argon fill, a modern low-E coating, or a warm-edge spacer is a modest increment on the order — details on the IGU page. Many customers use a broken pane as the excuse to quietly upgrade the coldest room in the house.
The rest of the glass shelf.
That crack is a part number,
not a renovation.
Photograph the damage and text it over. We'll confirm the unit, quote the swap, and have your window insulating again — without replacing it.