Common Issues with Double Glazed UPVC Doors and How We Fix Them

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Welcome to our comprehensive guide on common issues with double glazed UPVC doors and how we fix them. UPVC (Unplasticized Polyvinyl Chloride) doors have become a popular choice for homeowners due to their durability, energy efficiency, and low maintenance. However, like any home feature, they can experience problems over time. In this blog post, we’ll delve into the most common issues you might encounter with your double glazed UPVC doors and provide practical solutions to keep them in top-notch condition.

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1. Condensation Between the Glass Panes

Condensation between the glass panes is a frequent problem with double glazed UPVC doors. This usually indicates a failure in the sealed unit, often caused by wear and tear or manufacturing defects. Solution: - Replace the Sealed Unit: Unfortunately, the only long-term solution is to replace the affected sealed unit. This involves removing the old glass and fitting a new, properly sealed glass pane. - Improve Ventilation: Ensure good ventilation in your home to reduce humidity levels and prevent condensation.

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2. Doors Not Closing Properly

If your UPVC door isn't closing properly, it could be due to misalignment, worn-out hinges, or issues with the locking mechanism. Solution: - Realign the Door: Adjust the door hinges to ensure proper alignment. This might involve tightening or loosening the screws. - Check and Replace Hinges: Inspect the hinges for wear and tear. If they are damaged, replace them with new ones. - Lubricate the Locking Mechanism: Apply a silicone-based lubricant to the locking mechanism to ensure smooth operation.

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3. Drafts and Poor Insulation

Drafts around your double glazed UPVC door can undermine its energy efficiency, leading to higher energy bills and an uncomfortable home environment. Solution: - Check the Seals: Inspect the weatherstripping around the door. If it's damaged or worn out, replace it with new weatherstripping. - Adjust the Door: Ensure the door is properly aligned and closes tightly against the frame.

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4. Sticking Doors

A door that sticks can be frustrating and potentially damaging to both the door and the frame. This issue is often caused by swelling due to temperature changes or moisture exposure. Solution: - Adjust the Hinges: Tighten or loosen the door hinges to ensure a smooth operation. - Sand Down the Door: If the door is swollen, carefully sand down the sticking areas to allow for smooth movement.

5. Locking Mechanism Issues

Problems with the locking mechanism can compromise the security of your home and make it difficult to lock or unlock the door. Solution: - Lubricate the Lock: Apply a silicone-based lubricant to the locking mechanism to ensure smooth operation. - Replace the Lock: If the lock is damaged or worn out, consider replacing it with a new, high-quality lock.

6. Discolouration and Fading

Over time, UPVC doors can become discoloured or faded due to exposure to sunlight and environmental factors. Solution: - Clean Regularly: Clean your UPVC doors regularly with a mild detergent and water to remove dirt and grime. - Use a UV Protectant: Apply a UV protectant specifically designed for UPVC materials to help prevent further discoloration and fading.

7. Broken or Cracked Glass

Accidents happen, and sometimes the glass in your double glazed UPVC door can get cracked or broken. Solution: - Replace the Glass: Contact a professional to replace the broken or cracked glass pane. Ensure the new glass matches the specifications of your existing door.


Double glazed UPVC doors are an excellent investment for any home, offering durability, energy efficiency, and a modern aesthetic. However, like any feature in your home, they can experience issues over time. By understanding these common problems and knowing how to address them, you can ensure your doors remain functional and efficient for years to come.

Regular maintenance and prompt attention to any issues will not only extend the lifespan of your UPVC doors but also enhance the comfort and security of your home. If you encounter any problems that you’re unable to fix on your own, don’t hesitate to contact a professional for assistance.

Thank you for reading our guide on common issues with double glazed UPVC doors. We hope you found the information helpful and informative. For more tips and advice on home maintenance, be sure to check out our other blog posts.

We hope you found this guide helpful for maintaining your windows and doors! If you have any further questions or need professional repairs to your windows and doors, don’t hesitate to reach out to us.

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