22.03.2025

When it comes to uPVC double-glazed windows, many homeowners assume that visible damage or performance issues mean they’ll need to invest in a complete replacement. However, in most cases, this isn’t true. Double-glazed windows are designed with modular components, meaning they can often be repaired instead of replaced. Opting for repairs not only restores functionality but also saves you a significant amount of money.

Here we can take a look at some common issues with uPVC double-glazed windows and how they can often be fixed without replacing the entire unit.

Common Issues with uPVC Double-Glazed Windows

1. Condensation Between the Panes

Cause: A broken or failed seal allows moisture to enter the gap between the glass panes.

Solution: The sealed glass unit (often referred to as the insulating glass unit or "IGU") can be replaced without touching the uPVC frame. This eliminates the foggy appearance and restores thermal insulation at a fraction of the cost of replacing the entire window.

2. Drafts or Poor Insulation

Cause: Worn-out seals, faulty hinges, or misaligned frames.

Solution: Gaskets and seals can be replaced, and hinges or locking mechanisms can be adjusted or repaired. These fixes restore airtightness and insulation, keeping your home warm and energy-efficient.

3. Sticking or Jamming Windows

Cause: Warped frames, broken locks, or damaged handles.

Solution: Adjustments to the frame, replacement of worn-out hardware, or realignment of the sash can resolve this issue without replacing the entire window.

4. Discolored or Damaged Frames

Cause: Sunlight, weather exposure, or minor impacts.

Solution: Scratches and discoloration on uPVC frames can often be repaired using special cleaning agents or frame restorers. Severe damage can be fixed by replacing the frame covering, leaving the glazing untouched.

5. Broken Glass

Cause: Accidental damage or impact.

Solution: If the glass itself is cracked or shattered, only the IGU needs replacement. The surrounding uPVC frame remains intact, drastically reducing costs.

The Benefits of Repairing Over Replacing

1. Cost Efficiency

Replacing an entire window unit, including the uPVC frame and glazing, can cost several times more than repairing the specific faulty component. Repairs are targeted, addressing the exact problem without unnecessary expenses.

2. Environmental Sustainability

Repairing your windows reduces waste by reusing existing frames and materials. It also lowers the energy required to manufacture and transport a new window.

3. Minimal Disruption

Repairs are often quicker and less intrusive than full replacements. You avoid the need for construction work, making the process smoother and less stressful.

4. Preservation of Aesthetic

If you have custom or older uPVC frames, repairing the existing unit ensures your windows remain consistent in style and design.

When Should You Replace Instead of Repair?

While most issues can be repaired, there are exceptions:

Severe frame warping: If the frame itself is significantly damaged or misshapen, replacement might be the only option.

Persistent leaks: If repairs have been attempted but issues recur frequently, a replacement may be more cost-effective in the long run.

In any case it is worth having someone that specialises in double glazing repair to come and have a look at your windows to let you know if they are repairable. At Castle Locksmiths & Double Glazing Repairs we can do this part for you and will offer you a quote for free.

Conclusion

uPVC double-glazed windows are built to last, and most issues can be addressed with simple, cost-effective repairs. Don’t rush to replace a window just because of minor damage or performance issues. By consulting a professional repair service, you can save money, protect the environment, and extend the life of your windows.