If your windows are misty, cracked, or leaking heat, you might be wondering whether to replace the entire unit or just the glass. In most cases, double glazed replacement glass is the smarter, faster, and more affordable option. This ultimate UK guide explains when, why, and how to choose the right replacement—and what it’ll cost in 2025.
What Is Double Glazed Replacement Glass?
Double glazed replacement glass refers to replacing the sealed glass unit within a window frame—without changing the entire frame. It’s ideal when the frame is still in good condition but the glass unit has failed.
What’s Included in a Double Glazed Unit (DGU)?
- Two panes of glass
- A spacer bar separating the panes
- An insulating gas (usually Argon) between the panes
- A sealed perimeter to prevent condensation
When Should You Replace the Glass?
There are several warning signs that your double glazed replacement glass needs attention:
- Condensation between panes (the most common sign of a blown unit)
- Misty or foggy appearance
- Visible cracks or chips
- Cold draughts around the window
- Notable heat loss or rising energy bills
Replacing just the glass is quicker and more cost-effective than replacing the entire window frame, especially when the frame is structurally sound.
Benefits of Double Glazed Replacement Glass
Opting for double glazed replacement glass rather than full-frame replacement offers a number of benefits:
- Cost Savings: Only pay for the glass, not the frame or extra labour
- Improved Insulation: Restore the window’s thermal efficiency
- Reduced Noise Pollution: Maintains or improves acoustic performance
- Faster Installation: Can be done in under an hour per window
- Minimal Disruption: No need for plastering or decorating afterwards
- Eco-Friendly: Less waste sent to landfill
Types of Double Glazed Glass Available
When selecting your replacement, it’s important to choose the right type of glass for your needs:
- Clear Float Glass: Standard option for general use
- Low-E Glass: Energy-efficient coating that reflects heat into the home
- Toughened Safety Glass: Heat-treated for strength, ideal for doors and low-level windows
- Laminated Glass: Extra security with a plastic interlayer
- Patterned or Frosted Glass: For privacy in bathrooms or entryways
- Acoustic Glass: Enhanced sound insulation for noisy areas
How Much Does Double Glazed Replacement Glass Cost?
Costs vary depending on glass type, size, and complexity of installation. Here are average 2025 UK price ranges:
- Standard Clear Double Glazed Unit: £80 – £150
- Low-E or Energy-Efficient Glass: £120 – £220
- Toughened Glass: £100 – £180
- Laminated Glass: £120 – £200
- Acoustic Glass: £140 – £250
What Affects the Price?
- Size of the window
- Type of glass (standard vs upgraded)
- Window shape (rectangular vs custom shapes)
- Accessibility of installation site
- Urgency of the job (emergency vs scheduled)
DIY vs Professional Installation
While it might seem simple, replacing double glazing is a precision job. Poorly installed glass units can lead to leaks, poor insulation, and even shattered panes.
Why Use a Professional?
- Correct fitting and sealing
- Guaranteed workmanship
- Compliance with UK building regulations
- Safe handling of large or heavy units
- Accurate diagnosis (e.g. checking if the frame is damaged too)
For expert help with double glazed replacement glass, contact Cove Glass — serving homes and businesses across the South East with fast, professional service.
How Long Does It Take?
For most standard windows, replacing the double glazed unit takes 30 minutes to 1 hour per window. Custom units may require a short lead time for manufacturing.
Conclusion: A Smart Fix for Foggy Windows
Replacing damaged or misty double glazing doesn’t mean a full window overhaul. In many cases, double glazed replacement glass is all that’s needed to restore clarity, insulation, and comfort—quickly and affordably.
Want to breathe new life into your windows? Get in touch with Cove Glass today for trusted advice and professional replacement services.
📞 Call: 01252 318787
📧 Email: sales@coveglass.co.uk
🌐 Visit: Double Glazed Glass Replacement Services
FAQs
Q1: Can I replace just the glass in a double glazed window?
A1: Yes. If the window frame is intact, you can replace just the sealed glass unit, saving money and avoiding major disruption.
Q2: What causes condensation between panes?
A2: It usually means the unit’s seal has failed, allowing moisture inside. This is known as a “blown unit” and requires glass replacement.
Q3: How long do double glazed units last?
A3: On average, well-made units last 15–20 years, though this varies with quality, installation, and exposure to weather.