Thumbtack Logo

If you need a window seal repaired, call on a window specialist to put your panes in peak condition again in no time. Repairing a window seal can mean anything from replacing a window sash with damaged panes to defogging a double paned window that has moisture trapped inside. A sealed window is typically a double or triple paned window that has been factory sealed with gases injected between the panes. Also known as insulated gas units (IGUs), these gas-filled windows are much more common than single-paned glass windows in homes built in recent decades.

According to the U.S. Department of Energy, gas fills in windows improve energy efficiency, which will ultimately help reduce your utility bills. The gases limit heat transference and more effectively insulate your home against summer heat and winter cold.

Improving window efficiency

The International Association of Certified Home Inspectors (InterNACHI) explains that the gas filling the space between the panes of IGUs is usually either krypton or argon. These slow-moving gases permit less convection than oxygen, so their presence helps improve the thermal efficiency of your window. According to InterNACHI, gas-filled windows can leak as much as 1 percent per year, slowly reducing their efficacy over time but still providing good insulation 20 years or more after installation.

Damage to your windowpanes can breach the seal, allowing the gas inside to leak out and eliminating the insulating power of the single, double or triple paned window. If you can see the actual damage to the seal or glass, or notice moisture gathering between the panes, it may be time for professional help. If you’re ready to bring your windows back to their former glory, here are the cost factors for seal repair:

Sash replacement

If you want to maintain the insulating integrity of a window with a damaged seal, it may be necessary to replace the window sash. The term sash refers to everything contained within the window frame, including the rails, stiles, gasket, glass and gas (such as krypton or argon).

Many factors affect the cost of window glass replacements, explains Joe Puggioni of Weedsport Window and Glass in Weedsport, New York. These include the type of window frame, the distance of the window from ground level, the size of the window, the type of glass (internal grid, low-e, etc.), and more. It’s difficult to provide average costs for sash replacement, says Puggioni, which is why it’s important to get quotes for your particular situation. Here are some examples of cost:

  • Typical double-hung sash in vinyl, with approximately 24 by 30 inches of clear glass installed on site: $275 per sash from Weedsport Window and Glass.

    • For two sashes installed at the same location: $250 per sash.

    • For three or more sashes installed at the same location: $225 per sash.

An example of a very labor-intensive job would be an old Andersen milled unit without access moldings. The only way to replace the glass is to cut moldings with a straight edge and razor knife where the simulated moldings appear to be, says Puggioni with Weedsport Window and Glass. Specialty situations like this will increase cost. Replacing your window sash is almost always a more affordable option than replacing an entire window.

Removing moisture

Defogging is a newer technique to eliminate unsightly moisture that has collected between factory-sealed double or triple paned windows. The pro drills a small hole in the glass, cleans and dries the interior, and reseals the hole to prevent future fogging. The look of your window will improve, but defogging is simply an aesthetic procedure and will not replace the gases or return your window to its former thermal resistance (R-value). Defogging might cost anywhere from under $100 to a few hundred dollars, depending on the company, your geographic location, and the type and number of windows you want defogged.

Looking for a Window/Door Sealer for your project?

Now that you have an idea of the price range, let's find the right Window/Door Sealer for you.


Answer a few questions

We need some details to find the right pros for you.

Get free quotes

See cost estimates for pros who meet your needs

Pick a pro

Compare costs, reviews, and hire a pro you like.

How do we know these prices?

Millions of people ask Thumbtack for help with their projects every year. We track the estimates they get from local professionals, then we share those prices with you.

30k
Projects a day
1m+
Quotes sent this year
200k
Service pros quoting this year

Millions of people ask Thumbtack for help with their projects every year. We track the estimates they get from local professionals, then we share those prices with you.