Double glazing plays a vital role in your home’s energy efficiency, noise reduction, and security. But like anything, it doesn’t last forever. If your windows or doors are underperforming, it might be time for an upgrade. Here are five clear signs that your double glazing may need replacing—and how Keystone Glazing, trusted by homeowners across Chichester and West Sussex, can help.

Collage showing modern double glazed windows and doors installed by Keystone Glazing in West Sussex.

1. Condensation Between the Panes

If you’re noticing fog or moisture trapped inside the glass, it’s a telltale sign of a failed seal. This means your window is no longer insulating properly and may be costing you more in heating.

Solution: We offer fast double glazing unit replacements to restore your home’s energy efficiency without needing a full window replacement.

2. Draughts or Cold Spots

Feel a chill near your windows even when they’re closed? This is a sign that the seals or frames have become compromised, allowing cold air to enter and warm air to escape.

Solution: We provide professional resealing or replacement, ensuring your home stays warm and your energy bills stay low.

3. Increased Outside Noise

Double glazing helps block out external noise. If your home suddenly feels louder, it may mean the acoustic barrier has deteriorated.

Solution: Our modern glazing systems provide excellent soundproofing, ideal for busy roads or urban areas.

4. Difficulty Opening or Closing Windows

If your windows are sticking, warped, or won’t close properly, it’s not just an inconvenience—it’s a security risk.

Solution: Keystone Glazing can replace faulty mechanisms and handles or upgrade the units entirely for smooth, secure operation.

5. Your Windows Look Tired or Outdated

Old, discoloured, or pitted frames can drag down your home’s curb appeal and reduce property value.

Solution: We supply and install modern UPVC, aluminium, and timber-look windows in a range of finishes to match any style.

Why Choose Keystone Glazing?