Upgrade Old Double Glazing to Make Your Windows Warmer
Most homeowners assume that fixing cold rooms or draughts means replacing every window in the house. But that simply isn’t true.
Modern glazing technology now allows you to upgrade only the glass, restoring warmth, comfort, and efficiency without replacing your existing window frames.
At P Fahy Glazing Ltd, we’re officially introducing a dedicated new service:
Double Glazing Upgrades
A clean, fast, low-mess, and highly cost-effective way to improve your existing windows using modern A-rated thermal glass.See our double glazing upgrade page here.
Why Older Double Glazing Stops Performing
Homes built across Dublin and Wicklow during the 1990s and 2000s were fitted with early-generation double glazing. These units were considered modern at the time — but glazing technology has improved massively since then.
A lot of the double glazing installed during that period never contained insulating gas at all.
And in the units that did include gas, most of it has escaped by now, which means the window is no longer functioning as proper insulation.
Today, most older windows suffer from:
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No insulating gas or gas that has long since escaped
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Shrinking seals that let cold air and moisture in
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Loose or worn hinges and handles that reduce airtightness
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Cold patches and draughts, even when the window looks closed properly
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Outdated glass coatings that allow far more heat to escape than modern Low-E glass
Even if the double glazing still looks clear, it may be performing at only a fraction of modern standards, especially in colder weather.
Today’s A-rated glass is up to 70% more efficient, thanks to:
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Low-E coatings that reflect heat back into your rooms
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Argon gas cavities that dramatically reduce heat loss
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Warm-edge spacers that prevent cold edges and condensation
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Advanced double-seals that keep gas in and moisture out
The improvement in comfort is immediate and noticeable. For more information click here.
What Exactly Is a Double Glazing Upgrade?
A double glazing upgrade replaces only the sealed glass units in your windows.
Your frames stay exactly where they are.
That means:
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No plastering
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No painting
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No mess
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No removing frames
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No disruption to your home
Just brand-new, high-performance A-rated glass fitted into your existing window frames.
Every upgrade includes:
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A-rated Low-E double glazing
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Argon-filled insulation cavity
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Warm-edge spacer technology
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New seals (where required)
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Hinge and handle servicing
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Correct compression and full airtight closure
Your windows look the same — but perform like modern new-build windows.
When a Double Glazing Upgrade Makes the Most Sense
A glass upgrade is ideal if:
✔ Your windows are 10–25 years old
Common in homes in Stillorgan, Dundrum, Bray, Greystones, Knocklyon, Delgany, and similar areas.
✔ Some rooms never stay warm
This is almost always caused by old glass and worn seals — not the window frame.
✔ You see condensation or fogging between panes
A sure sign the unit has failed and lost insulation.
✔ Your frames are still in good condition
uPVC, timber and aluminium frames last multiple decades — older glass does not.
✔ Full replacement feels unnecessary or too expensive
Upgrading the glazing restores warmth and efficiency at a fraction of the cost.
A Fast, Clean Upgrade — Usually Completed in One Day
Our installation process is straightforward:
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Assessment & Measurement
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Custom manufacturing of A-rated units
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Removal of old glazing
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Installation of new double glazing
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Hinge, seal, and handle servicing
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Final airtightness testing
There is no interior damage, no redecorating, and no construction work.
Why Dublin & Wicklow Homes Benefit Most
Large numbers of homes in:
South Dublin:
Dundrum, Churchtown, Rathgar, Rathfarnham, Blackrock, Dalkey, Sandyford, Ballinteer, etc.
North Wicklow:
Bray, Greystones, Delgany, Kilcoole, Wicklow Town, etc.
…were built during Ireland’s early double-glazing boom.
Most of that glass is now 15–25 years old and performing far below modern standards.
A double glazing upgrade gives these homes:
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Warmer rooms
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Reduced energy loss
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Better airtightness
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Improved comfort
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Lower heating bills
—all without replacing window frames.
What Homeowners Notice Immediately
After a double glazing upgrade, most homeowners report:
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Warmer rooms, especially in winter
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Less condensation on cold mornings
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Reduced draughts
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Lower heating costs
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Quieter rooms
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More consistent temperatures throughout the house
These comfort gains are noticeable on day one.
A Smarter Alternative to Full Window Replacement
Replacing entire windows is often unnecessary — and expensive.
If your frames are solid, a double glazing upgrade offers:
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Much of the performance of modern A-rated windows
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Considerably lower cost
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A fast, clean installation
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Less waste and better sustainability
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No construction or redecorating
You keep the frames you like — and upgrade the technology inside them.
Book Your Free Double Glazing Upgrade Assessment
If parts of your home feel colder than they should, the issue may be your glass, not your frames.
We provide free call-outs across Dublin and Wicklow with:
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Clear, honest advice
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Transparent pricing
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No pressure
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No unnecessary upselling
Request your free assessment today from P Fahy Glazing Ltd.