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Can Misted Double Glazing Be Repaired

Can Misted Double Glazing Be Repaired Image

Wondering if can misted double glazing be repaired? Discover effective solutions to restore clarity, improve insulation, and extend your window's lifespan.

What Is Misted Double Glazing?

Misted double glazing is a frequently found issue that can affect any sealed window unit. It usually happens when condensation forms between the two existing panes of glass, creating a foggy or cloudy appearance. 

This happens because the airtight seal around the unit has broken, allowing moisture and air to enter the space that should be dry and filled with insulating gas. Once this seal fails, the gas used for insulation often escapes, reducing the window's ability to keep heat in and cold out. 

The misting cannot be wiped away from either side of the glass because it is trapped inside the sealed unit. As the problem worsens, the window may look streaky, hazy, or even stained. Not only does this spoil the appearance and block natural light, but it also means the window is no longer energy efficient. Misted double glazing is a clear sign that the unit is damaged and needs attention, whether through repair or full replacement.

Can You Fix Misted Glass Without Replacing It?

Yes, in some cases misted glass can be treated without replacing the entire window frame. One common method involves removing the moisture from between the panes by drilling tiny holes in the glass. These holes allow trapped condensation to escape and the unit to dry out. 

A drying agent, such as a special gel or gas, may be inserted to absorb any remaining moisture. Afterwards, the holes are sealed with clear vents or plugs to prevent more moisture from entering. This process can improve the clarity of the glass and reduce the foggy appearance, making the window look better without the cost of a full replacement.

Can Misted Double Glazing Be Repaired?

However, this type of repair does not restore the sealed unit to its original condition. Once the seal has failed and the insulating gas has escaped, the unit loses much of its thermal performance. 

Even after drying, the space between the panes will usually be filled with normal air rather than argon or another insulating gas. 

As a result, the window may still allow more heat to escape, reducing energy efficiency. For this reason, replacing just the sealed glass unit (not the whole frame) is often recommended to restore both clear visibility and proper insulation.

Professionals have all the right tools and training to help identify the cause of the misting, whether it’s a failed seal, damaged unit or poor installation. 

They can carry out repairs that are both airtight and watertight, helping to prevent future problems and restore the window’s performance.

When Is Double Glazing Repair a Good Option?

Repairing misted double glazing is often a good choice when the window frames are still in good condition and the issue is limited to the sealed glass unit. If the misting is light and noticed early, a professional may be able to clear the moisture or replace just the glass without needing to touch the frame. 

This can restore the appearance and improve comfort at a lower cost than full replacement. It’s also much less disruptive, as there’s no need to remove or refit the entire window. 

In some cases, repair is a better option than replacement, especially if the windows are fairly new or match others in the home. Replacing the entire unit can be rather expensive and unnecessary, especially if the problem is minor.

 Repairing the sealed unit allows you to keep the existing frame, preserve the look of the window, and save money. It’s a practical solution when only part of the window has failed and everything else is working well. However, it’s still important to have the window inspected to make sure the repair will be effective.

How Much Does a Repair Usually Cost?

Costs of repairing misted double glazing will typically depend on a number of factors, including the size of the glass, the type of glazing, and how severe the misting is. For a standard sealed unit, the average repair or replacement cost is usually between £50 and £150 per window. 

Small windows, like those in toilets or hallways, tend to be at the lower end of the price range. Larger windows or double doors, such as patio or bay windows, can cost more due to the extra glass and labour involved. If the glass needs to match existing styles, such as frosted, toughened or patterned panes, the cost may also increase slightly.

Double Glazing Repair

In comparison, replacing the full window unit, including the frame, can be much more expensive. This often ranges from £300 to over £800 per window, according to the materials, design and installation required. 

If the frames are still in good condition, repairing just the sealed glass unit is usually the most cost-effective option. 

It saves money while still improving the look and performance of the window. Always check that the quote includes both parts and labour, and make sure the work comes with a guarantee for added peace of mind.

How Long Will a Repair Last?

The lifespan of any repaired misted windows can vary, but when done properly by a professional, it can last between 10 and 20 years. This is similar to the expected life of a new double glazing unit. 

The key factors that affect how long the repair lasts include the quality of the materials used, the condition of the existing frame, and how well the new sealed unit is installed. If the frame is still strong, undamaged, and well-sealed, the new unit should remain clear and energy efficient for many years. 

However, if the surrounding frame is old, warped, or was poorly installed in the first place, the repair may not last as long. Gaps or damage around the edges can allow moisture back in, leading to future misting. For this reason, it’s important to have the whole window assessed before going ahead with the repair. 

Selecting a trusted professional who uses high-quality glass and offers a guarantee will give you much more confidence that the repair will last and continue to perform well over time. Plenty of cleaning and good ventilation inside the home can also help protect your windows and extend their lifespan.


Are you looking for a trusted double glazing company in Maidstone, Tonbridge, Kent and the surrounding areas? At Window Fix Direct Kent, we offer a range of double glazing services - all provided by our team of professional specialists.