Windows That Perform Like New - Without Full Replacement
Most heat loss in older windows comes from old glass, worn seals and moving parts — not the window frame.
GlassRetrofits.ie restores window performance by upgrading the glass, renewing seals, and correcting hinge and handle compression.
It’s a targeted retrofit that delivers modern thermal performance – and is far more cost-effective than full window replacement.
Warmer Windows — While Keeping Your Existing Frames
We address the actual failure points in older windows by upgrading what matters — and only what matters — to restore performance as a complete system.
Our glass retrofit includes:
✅ The latest A-rated, energy-efficient glass
✅ New window seals where required
✅ Hinges serviced or replaced where necessary
✅ Handles adjusted or replaced if needed
✅ Final adjustment and performance check
✅ 10-year performance guarantee on all glass units
A New Window Upgrade Service for Irish Homeowners
For years, window upgrades have been treated as an all-or-nothing decision. That assumption has left homeowners choosing between living with poor performance or replacing entire windows — with no meaningful middle option.
Rethinking Window Upgrades
Most Irish homes don’t need full replacements — it’s usually failed glass, worn seals, and closing hardware that cause heat loss and draughts.
Rethinking Window Energy Efficiency
Upgrading glass and restoring airtightness delivers today’s comfort and savings without the disruption of new windows.
Rethinking window lifespan
PVC window frames last decades. Our glass retrofit extends their usable life while reducing cost and unnecessary waste.
How a Glass Retrofit Boosts Home Comfort
When modern glazing is combined with restored airtightness and correct window closure, you can expect:
Warmer Rooms
Draughts Eliminated
Reduced Heat Loss
Heating Works More Efficiently
Lower Outside Noise
Reduced Heating Demand
Modern Low-E glazing can be more than twice as insulating as old double glazing.
By combining this with proper window adjustment, this delivers a substantial performance upgrade — without replacing the window frame.
Typical Insulating Performance by Glass Type
Modern Low-E glass delivers significantly better thermal performance than older double glazing — even when frames are unchanged.
Illustrative comparison based on typical performance of common glazing types. Actual results vary by window design and condition.
When a Glass Upgrade Makes the Most Sense
Across Ireland, many homes have sat between two poor options – expensive full window replacement or living with cold, draughty rooms.
A glass retrofit offers a third option: restoring warmth and performance without replacing the frames.
Your Windows were Installed 15+ Years Ago
Double glazing fitted in the late 1990s or 2000s no longer performs to modern standards. Even if it looks intact, the glass is often losing significant heat compared to today’s Low-E units.
You Have Cold Rooms or Draughty Windows
If certain rooms never feel comfortable, the issue is often outdated glazing or worn seals — not your heating system. A glass retrofit targets these weak points directly.
Full Window Replacement Feels Like Overkill
Most window frames last for decades. Replacing the entire window can be unnecessary when performance issues can be resolved by upgrading the glass and restoring airtightness.
The Cost of New Windows Feels Excessive
Full replacement is expensive and disruptive. A glass retrofit delivers a major performance upgrade at a fraction of the cost, making comfort improvements more accessible.
You Want a Clean, Low-Disruption Upgrade
Glass retrofits are typically completed in a day, with no plaster damage, no redecorating, and minimal disruption — ideal for lived-in homes.
You are looking at ways to Lower Your Energy Bills
Outdated glazing quietly drives up energy bills. Our targeted glass retrofit and frame servicing package addresses heat loss at its source, helping reduce energy use year after year.
Our Glass Retrofit Process
- Free Window Assessment
- Clear Quotation & Upgrade Options
- Low-E Glass Manufacturing
- Installation Scheduled
- Glass Installation & Frame Servicing
- 10 Year Glass Performance Guarantee
A Simple, All-in-One Window Upgrade Service
No jargon. No sales packages. Just one straightforward glass retrofit service that makes your home warmer and more efficient — without replacing your windows.
At GlassRetrofits.ie, we bring everything together in one straightforward service.
And with a 10-year guarantee on the integrity of all glass units, you get peace of mind as well as performance.
One package. One team. One lasting solution.
Book Your Free Call-Out and Fix Your Window Performance.
Glass Retrofit FAQs — Common Questions We Get Asked
Is My Double Glazing Still Effective After 15–25 Years — or Do I Need a Glass Retrofit?
In most Irish homes, double glazing installed 15–25 years ago is no longer performing as originally intended — even if it looks perfectly intact.
Early double-glazed units relied on basic air or gas-filled cavities and lacked the advanced Low-E coatings and warm-edge spacer technology used today. Over time, the insulating gas slowly escapes through the edge seals, and the thermal performance of the unit declines year by year.
This degradation is gradual and invisible. Homeowners often only notice it once rooms begin to feel colder, condensation becomes more frequent, or heating costs rise.
A glass retrofit replaces these outdated sealed units with modern A-rated Low-E glazing while keeping the existing frames. This restores the insulating performance of the window to modern standards without the disruption or cost of full replacement.
Why Can I Feel Draughts Even Though My Windows Look Fine?
This is one of the most common and most misunderstood window problems.
In the vast majority of cases, draughts are not caused by cracks, broken frames, or visible gaps. They occur because the window no longer closes with proper compression.
Over time:
seals shrink and harden
hinges wear and sag
handles lose tension
The window still shuts, but it no longer pulls tightly against the frame. Cold air is drawn in around the edges, particularly in windy conditions.
As part of a glass retrofit, windows are serviced and adjusted so that the upgraded glazing performs properly. Restoring correct closure pressure is essential — without it, even the best glass will underperform.
Are Glass Retrofits Much Cheaper Than New Windows?
Yes — when your windows are suitable.
Full window replacement involves:
removing existing frames
disposing of old units
installing new frames and glazing
repairing internal finishes
This adds significant material, labour, and finishing costs.
A glass retrofit focuses only on what actually needs upgrading: the insulating glass and window performance. Because the frames remain in place, costs are typically around 50–60% lower than full replacement, while delivering most of the comfort and efficiency improvement.
This is why glass retrofits sit between “doing nothing” and “replacing everything”.
Is a Glass Retrofit Less Disruptive Than Replacing My Windows?
Yes — substantially.
Glass retrofits are usually completed within a single day and do not involve:
removing window frames
damaging plaster or reveals
redecorating
There is minimal noise, no structural work, and no extended disruption. This makes glass retrofits particularly suitable for lived-in homes, apartments, and occupied buildings where full replacement would be impractical.
Will a Glass Retrofit Actually Make a Noticeable Difference to Comfort?
In the right circumstances, yes — often immediately.
Modern Low-E, argon-filled glass units can be up to 70% more thermally efficient than older or failed double glazing. When combined with restored airtightness, homeowners typically notice:
warmer internal glass surfaces
fewer cold downdraughts
more even room temperatures
reduced heating run-time
improved acoustic comfort
However, it’s important to be clear: a glass retrofit improves window performance, not overall building insulation. It will not compensate for poorly uninsulated walls or roofs, but it can make a very noticeable difference where windows are causing heat loss.
Do Glass Retrofits Qualify for SEAI Grants or Improve My BER Rating?
Glass retrofits do not currently qualify for SEAI window replacement grants, as the frames are retained.
Upgraded glazing may contribute to an improved BER score, but this depends on:
how the BER assessor records the upgrade
the proportion of heat loss attributed to windows
the overall energy performance of the home
We do not position glass retrofits as a grant-driven solution. They are a comfort-led and performance-led upgrade, designed to deliver real improvements regardless of grant eligibility.
When Is a Glass Retrofit Not the Right Solution?
A glass retrofit may not be suitable if:
frames are rotten, warped, or structurally compromised
windows are single-glazed
existing frames cannot safely accommodate modern sealed units
In these cases, full replacement may be the correct solution. We assess each window individually and will say so where appropriate. Our approach is assessment-led, not sales-led.
Is a Glass Retrofit Just a Temporary Fix?
No — not when done correctly.
A glass retrofit is a permanent performance upgrade, not a stopgap. By replacing the insulating glass and restoring correct window closure, you are addressing the root causes of heat loss and discomfort rather than masking symptoms.
It is the same principle as replacing worn brake components rather than the entire car.
How Do I Know If My Windows Are Suitable for a Glass Retrofit?
The only reliable way to know is through an on-site assessment or picture / videos.
We inspect:
the condition of the frames
how the windows operate and close
the suitability of the existing units for upgrade
We then give a clear, honest recommendation — whether that is a glass retrofit or full replacement. There is no obligation and no pressure.