Yes, but only by replacing the insulated glass unit (IGU) or hiring a professional for specialized defogging services. You cannot effectively reseal a double-pane window yourself with standard caulk because the gap between the panes is factory-sealed and contains a vacuum or inert gas (like argon).
Resealing double-glazed windows can be helpful if you notice: Condensation on the inside of the glass. Draughts from the window. Visible wear, tear, or gaps in the seal.
Moisture seeps into the area between the two pieces of glass after the seal fails. To clean the fog between the window panes, you need first to take off the seal and then individually clean each piece of glass. After you clean the window panes, you then need to put everything back together and reseal them.
Foggy double-pane windows mean the inner seal has failed, allowing moisture to condense between the glass. You cannot wipe this away. The most permanent solution is replacing the insulated glass unit (IGU). Alternatively, a local glass service can defog it, or you can replace the sash yourself.
If multiple-pane windows appear misty or foggy, it means that the seal protecting the window assembly has failed. A desiccant is an absorbent material designed to maintain dryness in the space it protects.
Double-pane windows typically last 15 to 25 years. However, the lifespan of the glass seal itself averages 10 to 15 years. After this, the seal may fail, causing insulating gases like argon to leak out and condensation to form between the panes.
The average window seal replacement cost in the UK is around £125 - £180. However, the total cost will depend on the scope and complexity of the job. The total cost of uPVC window rubber seal replacement will be a combination of the material costs and labour — including any call-out fee.
You cannot clean inside a sealed double-pane window without breaking the vacuum seal. If dirt or moisture is trapped between the panes, the desiccant is saturated and the seal has failed. Your only options are professional glass restoration, replacing the glass unit, or a DIY drilling method.
The cheapest time of year to replace windows is during the off-season, which runs from late fall through winter. Demand drops significantly during these months, prompting manufacturers and contractors to offer steep discounts and special promotions to keep their crews busy.
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Signs it's time to reseal your windows
Look for visible signs of wear such as cracking, peeling, shrinking, or separation from the frame or wall surface. If you feel a draft when standing near the window, especially on windy days, that often indicates a failed sealant.
Yes, you can often reseal windows rather than replacing them entirely. The decision between resealing (or repairing) and replacing depends entirely on the type of window, the extent of the damage, and whether the issue is internal or external.
When a double pane window loses its seal, the insulating gas escapes and is replaced by outside air, which causes moisture to become trapped between the panes. This leads to permanent fogging, reduced energy efficiency, and potential glass distortion.
Replacing only the glass is significantly cheaper than replacing the entire window. While you'll still need to pay for the glass and installation, of course, you won't need to buy a new frame.
Cloudy double-pane windows usually fall into two categories: dirty glass on the outside (or inside your home) that you can easily wipe away, or permanent fog and mineral haze trapped between the glass panes.
Professional window cleaners generally use either purified water (for water-fed poles) or a mixture of water and specialized detergents (for traditional squeegee work).
Yes, a mixture of vinegar and Dawn dish soap is highly effective, inexpensive, and a great DIY alternative to commercial window cleaners. The vinegar cuts through grime and prevents water spots, while the Dawn cuts grease and provides the perfect lubrication for a squeegee to glide across the glass.
Different window styles come with different price tags for seal replacement, and knowing which type you have can help you budget more accurately. Double-pane windows generally cost between $40-$125 per seal to repair, while triple-pane windows typically run $110-$900 per seal due to their more complex construction.
Seal Replacement
If only part of the seal has failed, it may be possible to replace that section without removing the entire window. This restores the window's clarity and improves energy efficiency slightly.
You should inspect window seals (caulking) annually and reseal them every 5 to 10 years. This timeframe depends on your local climate, weather exposure, and sun intensity. However, you should reseal immediately if you notice cracking, peeling, drafts, or water leaks.
In many cases, it is cheaper to replace all windows at once. Full-home projects usually qualify for better per-window pricing because of manufacturing efficiencies, a single installation cycle, and lower labor per unit. You also avoid future price increases and start saving on energy bills sooner.
Replace double glazing to benefit from the advancements in double glazing technology over the past 20 years. Today's windows have a U-value of 1.2 W/m²K compared to 2.8 W/m²K of older units. So they're more than twice as good at keeping heat in.
Here are the most common early-warning signs: