If your double glazing was installed two decades ago, you’re probably wondering: Is it time to replace it? It’s a fair question. After all, double glazing isn’t a cheap investment, and if your windows seem to be holding up okay, why change them?
But here’s the thing—like most things in your home, windows age. And as they do, they can lose their efficiency, their looks, and in some cases, their ability to keep you warm, dry, and safe.
Let’s explore the real reasons why replacing 20-year-old double glazing might be well worth the effort—and how it could save you money, improve your comfort, and even boost your property’s value.
Before diving into the benefits of new windows, let’s look at some telltale signs that your existing ones are on their last legs:
Condensation between panes: This means the seal has failed and the unit has lost its insulating gas.
Draughts: If cold air is seeping through, your windows aren’t doing their job.
Hard to open or close: Warped or stiff frames make daily life harder.
Mould or damp near windows: Older units can contribute to moisture problems.
Increased energy bills: A spike in heating costs may indicate heat loss through inefficient glazing.
Visible damage: Cracks, chipped frames, or broken locks all reduce window performance and security.
If you’ve noticed one or more of these, it’s time to consider your options.
Windows installed in the early 2000s were revolutionary at the time. But 20 years is a long time in the world of building technology.
Here’s what modern double glazing has to offer:
Improved energy efficiency: Today’s windows often feature A++ ratings with low-emissivity (Low-E) glass and argon gas for superior insulation.
Triple glazing options: Even greater thermal performance and noise reduction.
Better frame materials: Modern uPVC, aluminium, and composite frames are slimmer, stronger, and longer lasting.
Enhanced security: Multi-point locking systems and toughened glass offer better protection.
Stylish design: Clean lines, modern colours, and slimmer profiles add serious kerb appeal.
When you compare your 20-year-old windows with today’s offerings, the difference is striking.
New windows don’t just save energy—they boost your everyday quality of life:
Noise reduction: Modern units keep out street noise, barking dogs, and coastal winds.
Improved ventilation: Better hinge systems and opening options help with airflow.
Less maintenance: New frames resist warping, discolouration, and wear.
Visual upgrade: Whether you’re going for classic white or contemporary anthracite grey, new windows instantly refresh your home’s look.
These benefits can make a noticeable difference in how you experience your home every day.
Living on the South Coast has its perks—seaside views, fresh air, and beach walks. But it also brings challenges for window longevity.
Here’s why:
Salt air can corrode older hardware and degrade seals more quickly.
High winds test the durability of ageing frames.
Storms and moisture increase the risk of leaks and drafts.
If your home is within a few miles of the coast, replacing your windows with modern, weather-resistant alternatives could be a smart move for both comfort and long-term property protection.
At RPS Glazing Repairs, we often get asked whether it’s better to repair or replace old double glazing. And honestly—it depends.
You might only need repairs if:
The frames are still in good condition.
Only one or two units have misted.
Minor issues like hinges, handles or seals need fixing.
But replacement is usually the better option if:
Multiple units are failing.
The frames are warped, discoloured, or cracked.
Your energy bills are creeping up despite repairs.
You’re upgrading your home for resale or long-term comfort.
The good news? We can assess your windows and give you clear, no-pressure advice on the best route forward.
In most cases, yes—replacing 20-year-old double glazing is worth it, especially if:
You want a warmer, quieter, more stylish home.
You’re aiming to cut heating costs.
You’re planning renovations or upgrades.
Your current windows are showing visible signs of wear.
And if you’re near the coast? It’s even more important to stay ahead of the curve and avoid bigger problems down the line.