Fogged Window Glass Replacement Cost: What Drives the Price

A fogged window doesn't mean you need a new window. In most homes, the frame is fine and only the sealed glass unit inside it has failed. Replacing just that glass is typically $1,000 less than replacing the whole window, and you keep the frame, trim and paint you already have.

This guide explains what you pay for when replacing fogged window glass and how to get an accurate, itemized quote.

A typical residential single- or double-hung sash insulated glass unit starts around $185–$300 for the glass unit only; installation is additional. Size, shape, clear/Low-E/tempered glass and internal grids affect the unit price. Installation varies with quantity, complexity and access, including ladder or scaffold setup. Every estimate is itemized.

What you're actually replacing

A double-pane window has two sheets of glass with a sealed air space between them. That sealed assembly is called an insulated glass unit, or IGU. You'll also hear it called a thermopane, a sealed unit or double-pane glass. When the seal between the panes breaks down, moist air gets in and condenses on the inside surfaces, where you can't wipe it off.

The fix is to replace the insulated glass unit. Our technicians measure it, we order a new unit manufactured to the exact size, and we install it in your existing frame. That's the whole job. There's no new window, no new trim and no repainting.

If you're not sure the seal has failed, read how to tell if a window seal is broken first.

Why replacing just the glass costs less than a new window

Glass replacement keeps the existing frame and sash when they are sound. You pay for the replacement glass unit and installation rather than a complete replacement window. The work and finishing required for a new window vary with the opening and installation method.

That's why glass-only replacement typically runs about $1,000 less per window than replacement. Compare the two side by side in our repair vs. replacement guide.

8 things that set the price of fogged glass replacement

Every quote we write is itemized, so you'll see each of these on paper.

1. The size of the glass

Bigger units cost more to make, ship and handle. A small bathroom window and a large picture window are very different jobs, even if both are just "one fogged pane."

2. The shape

Rectangles are the least expensive shape to make. Arches, half-rounds, circles and angled tops need a template of the opening, and they cost more to fabricate. Many Northern Virginia homes have arched transoms over foyer and great-room windows, and those are some of the most common shaped units we replace.

3. Tempered glass where the code requires it

Some openings require safety glazing under the applicable code. The exact location, dimensions and use matter. We assess the opening and specify tempered glass where required; the glass specification is included in your itemized quote and can affect the unit price.

4. Matching your other windows

The new glass should look like the windows next to it. If your windows have Low-E coating (see glass options), we match the Low-E so the new pane doesn't look different in color from the outside. Bathroom windows with obscure (privacy) glass get obscure glass. Tinted glass gets matched tint. Matching keeps your house looking uniform. The selected coating, tint and other specifications can affect the glass-unit price.

5. Grids between the panes

Many windows have decorative grids (also called muntins or grilles) sealed between the two panes. These differ from mullions, which join separate window units. When we replace a unit with grids, the new unit is made with a matching grid pattern inside it. Grid units cost more than plain glass.

Simulated Divided Lights (SDLs) are applied to the outside surfaces of the glass rather than sealed between the panes. Reusing existing SDLs often involves removing old adhesive and reapplying the bars after the new insulated glass unit is set in the sash. American Screen & Glass regularly handles this work and checks the condition of the existing bars before recommending reuse.

Internal grids and SDLs can also be combined. We work with you to match the surrounding windows while keeping the solution as cost-effective as possible.

6. How hard the window is to reach

A first-floor window we can reach from inside is the simplest job. Second-story windows, two-story foyers and tall window walls need tall ladders, extra hands, scaffolding and sometimes a lift. Access adds labor, and it's one of the biggest swings in price between two windows of the same size.

7. How many windows you replace at once

Each visit has a fixed cost: the trip, the setup and the cleanup. Replacing three or four fogged units in one visit allows those travel and setup costs to be spread across multiple units, so the price per window drops. If you have one fogged window now and another starting to haze over, it often makes sense to do both at the same time.

8. How the glass is held in the window

Some windows let our technicians remove the glass from inside by taking off the stops or trim that hold it in place. Others need the sash taken out first. Older wood sashes sometimes need glazing work or small repairs while the glass is out. None of this changes the basic job, but it affects how much work is needed to get the job done.

When a new window makes more sense

Replacing the glass is the right call when the frame is sound. A new window is the better investment when:

• The frame or sash is bent, warped, bowed, rusted or rotten beyond repair. Check wood window sash repair first when wood restoration, a replacement sill or a new sash could preserve the window.
• The window no longer opens, locks or seals, and the hardware can't be fixed. Check window repair first.
• Most of the windows in the house are failing at once and you want a different style.

If that's where you are, we also install replacement windows. We'll tell you which one makes sense for each opening.

How to get an accurate fogged glass quote

1. Count the fogged panes. Walk through the house and note every window with haze, streaks or droplets between the glass. Include sliding doors and sidelights.
2. Photograph each one. Take one photo of the whole window from inside and one close-up of the fogging. If a window has grids or an arched top, make sure they're in the photo.
3. Note the room and the floor. A bathroom window, a door sidelight and a second-story window are priced differently. Write down where each one is.
4. Measure the visible glass, if you can. Width and height of the glass you can see is enough for a ballpark. Our technician takes the exact measurement.
5. Send it to us. Upload your photos on our free estimate form or call 703-471-4500. You'll get a free, itemized estimate.
6. Confirm on site. A technician confirms the measurements, we order your glass, and we come back to install it.

Use our glass project calculator to organize dimensions and optional details for your estimate. Our technician confirms the final measurements and specification.

Fogged glass in sliding doors and sidelights

Patio doors and door sidelights fog for the same reason windows do, and the glass can be replaced the same way. Door and sidelight glazing is checked against the applicable safety requirements, with tempered glass used where required. If your sliding door also sticks or won't lock, read our sliding glass door repair guide. Both can be handled on the same visit.

For glass that's cracked rather than fogged, see broken window glass.

Get a free, itemized estimate

American Screen & Glass has replaced fogged window glass throughout Northern Virginia. We serve all of Northern Virginia, including Fairfax County, Loudoun County, Arlington County, Alexandria and parts of Prince William County.

Repair first. No pressure. Send us photos for a free estimate or learn more about our fogged window glass replacement service.