CostBeaverWindow Glass Replacement Cost: When to Swap the Glass, When to Replace the Window
WINDOWSReplacing just the glass in a double-pane window — the sealed insulated glass unit, or IGU — costs about $200–$600 per pane in 2026. A whole new vinyl window installed runs $650–$900. Glass-only is the right call for a broken or fogged pane in a window under 15 years old with a solid frame. On a window 20 years or older, put that money toward the whole unit — you'd be putting new glass in a frame that's already leaking air around it.
The short version
- Glass-only replacement (an IGU swap) runs $200–$600 per pane in 2026, depending on size and coatings. A whole installed vinyl window is $650–$900.
- Fog between the panes means the seal has failed and the insulating gas is gone. No spray, wipe, or defogging kit fixes it — the sealed unit gets replaced.
- The math favors glass-only on newer windows with sound frames, and a whole-window replacement once the frame itself is 20+ years old.
- A window screen is a different animal entirely: $20–$50 to re-screen a frame yourself, $50–$150 per screen for a pro.
The two numbers that frame this whole decision
My neighbor two doors down got both quotes on the same afternoon last October. Fogged-up picture window, 1998 vinyl frame. Glass-only: $410. Whole new window, installed: $840. She stood in the driveway holding both quotes and asked me which one was the ripoff.
Neither. And that's what makes this decision interesting.
In 2026, swapping the sealed glass unit in a double-pane window runs $200–$600 per pane across Georgia and the Carolinas. Small bedroom window with plain clear glass, low end. Big pane with Low-E coating and argon fill, high end. A whole new vinyl window installed runs $650–$900, and fiberglass pushes $950–$1,400. So glass-only saves real money on paper. Whether it saves money in practice depends entirely on the frame it's going into — more on that fight below.
Why your window fogged up in the first place
A double-pane window is really a glass sandwich: two panes, a sealed gap between them, usually filled with argon, with a desiccant strip in the spacer soaking up any trace moisture. That sealed sandwich is the IGU — the insulated glass unit. The frame is just the thing holding it.
Seals don't last forever, and our climate is rough on them. Every day from May to September, the sun cooks the outer pane while your AC chills the inner one, and the sandwich expands and contracts. Thousands of cycles. Eventually the seal gives, humid outside air gets pumped in, and the first cool morning it condenses where you can't wipe it.
That white haze between the panes? That's the moment the window quit insulating. The argon left a long time ago. What you're looking at is the receipt.
Seal failure happens everywhere, but Charleston, Savannah, and the coast run the accelerated version. Dew points sit in the 70s for months, so the pressure pushing moisture at a weakened seal never lets up, and salt air corrodes aluminum spacers on top of it. Coastal glass shops will tell you they see failed IGUs in windows barely 10 years old, a solid 5 years ahead of what the same window does in Atlanta or Charlotte. If you're in West Ashley or Mount Pleasant with fogged panes, you're not unlucky. You're local.
When glass-only is the smart move
The IGU swap earns its keep in a few specific situations:
- The window is under about 15 years old. The frame still has real life left, so pairing it with new glass makes sense.
- One broken pane. Baseball, mower rock, the June hailstorm. If the frame is fine, replace the glass and move on.
- A single fogged unit in an otherwise healthy set. One bad seal at year 10 doesn't condemn the house.
- Specialty or historic sizes. In Savannah's Historic District or downtown Charleston, where the review board has opinions about your facade, a glass swap keeps the original frame and skips that entire conversation.
One warning: pass on any company selling a defogging service, where they drill the pane and pump the moisture out. The fog comes back, and the insulating gas they can't put back was the point of the window.
When to stop patching and replace the window
Here's my actual opinion, and it costs some people money to hear: on a window 20 years or older, put the glass-swap money toward a whole new unit.
Think about what fogged that glass. Two decades of thermal cycling. The same two decades hit the frame, the sash, the weatherstripping, and the balances. New glass in that window fixes the one failure you can see and none of the ones you feel on your Georgia Power bill in August. The vinyl has chalked and gone brittle, the sash gaskets are flat, and pollen season proves the air leaks every spring with a yellow dust line on the sill.
And the failures don't come alone. A 22-year-old window that fogged in the den will start fogging in the bedrooms, one seal at a time, $400 a visit. Three service calls in, you've spent most of a new window on a frame that still whistles in January.
Multiple fogged panes, drafts you can feel, sashes that need a prop stick — that's a window at the end, not a glass problem. Our double-pane cost guide breaks down what full replacements run per window and where the money goes.
What glass and window replacement cost in 2026
Rough installed numbers across Georgia and the Carolinas this year. Size, coatings, and access move every one of them.
| Job | Typical 2026 cost | When it makes sense |
|---|---|---|
| IGU swap (double-pane glass only) | $200–$600 per pane | Newer window, sound frame, one failure |
| Single-pane glass repair | $150–$350 | Older single-pane and storm windows |
| Whole vinyl window, installed | $650–$900 | Frame 20+ years old or visibly failing |
| Whole fiberglass window, installed | $950–$1,400 | Longer-haul frame, stronger in coastal heat |
| Whole-house, 10 windows | $7,000–$14,000 | Multiple failures — package pricing beats one-at-a-time |
| Screen re-screen (DIY kit) | $20–$50 | Torn mesh, frame intact |
| Screen replaced by a pro | $50–$150 per screen | Bent frames, specialty sizes |
One quiet economic note: replacing windows one at a time is the most expensive way to buy them. Trip charges and single-unit pricing add up, and crews discount volume. If three seals have failed, price the whole house on the window calculator before committing to fix number three.
And the screens, since you asked
Screen damage rides along with glass questions, so here's the quick version. Torn mesh in a straight frame is a $20–$50 DIY job: a roll of fiberglass screen, a spline roller, twenty minutes on the tailgate. Genuinely one of the easiest fixes a house offers.
Bent frames or odd sizes go to a hardware store or screen shop at $50–$150 per screen. Worth doing. A screenless window in a Carolina summer is a choice between stale air and mosquitoes, and near the coast the no-see-ums vote too.
One upgrade worth knowing: if pollen is your enemy, ask about tighter-weave pollen screens. They cut the yellow film that coats everything inside an open window each spring, for a few dollars more per screen.
