If you’re thinking about replacing the windows in your Dublin home, casement windows are worth a serious look. They’ve been the go-to choice for Irish homeowners for decades – and for good reason. They open fully, seal tightly when closed, and work well in almost every type of property, from a 1930s semi in Terenure to a new build in Swords.
This guide covers the main benefits, the different types available, what installation actually involves, and how to make the most of any grant support you might be entitled to.
What Are Casement Windows?
Casement windows are hinged at the side and swing outward – or occasionally inward – using a handle or crank. The whole sash opens, so you get the full width of the window as ventilation, which is something sliding or sash windows can’t match.
They’re one of the most common window styles across Dublin, and they fit well in both modern and traditional homes.
Benefits of Casement Windows for Irish Homes
1. Better Ventilation
Because the entire sash opens outward, casement windows allow far more air into a room than tilt-and-turn or sliding windows of the same size. For rooms that need fresh air – kitchens, bathrooms, bedrooms – this matters.
2. Strong Energy Efficiency
When closed, a casement window presses tightly against its frame on all four sides. This tight seal reduces draughts significantly and keeps more heat inside during the colder months. Paired with double or triple glazing, the difference to your energy bills can be noticeable.
Thermoglaze’s casement windows use a multi-chambered Elite 70 profile – available in both Sculptured and Chamfered Frame styles – which is specifically designed for superior thermal performance in Irish conditions.
3. Clear, Unobstructed Views
The large single-pane format means nothing gets in the way of your view. If you’re looking out onto a garden, green, or the sea, casement windows give you the best of it.
4. Security as Standard
Every casement window Thermoglaze installs comes fitted with hinge claws and a multi-point shoot bolt locking mechanism. Security isn’t an add-on here – it’s built into every unit as standard.
5. Low Maintenance
Modern casement window frames – particularly in uPVC and aluminium – need very little upkeep. No painting, no sanding, no warping. A wipe-down with a damp cloth keeps them looking well year after year.
Types of Casement Windows Available in Dublin
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uPVC Casement Windows
uPVC windows are the most popular choice in Ireland. They’re well priced, they hold heat well, and they need almost no upkeep. You can get them in a range of colours and finishes – including woodgrain effects that look right on older homes without the maintenance that real timber needs.
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Aluminium Casement Windows
If you want slim frames and a sharp, modern look, aluminium windows are a good fit. They’re light, strong, and can cover larger openings than uPVC. The colour finish holds well over time too.
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Alu Clad Casement Windows
Alu clad windows have a timber interior and an aluminium exterior. The inside looks warm and natural; the outside handles Irish rain without issue. They tend to be chosen for new builds and architect-led projects where both look and performance matter.
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Timber Casement Windows
For Victorian terraces, Edwardian semis, or homes in conservation areas, timber windows are often the right call – and sometimes the only one planners will approve. They need more care than other materials, but they’re hard to argue with when the look has to be right.
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Tilt & Turn Windows
If you want a window that tilts inward for background ventilation and also swings fully open for cleaning or access, tilt and turn windows are worth considering alongside traditional outward-opening casements.
Glazing Options: What to Know?
Thermoglaze offers four glazing options across its casement range, each giving different results on heat retention and noise reduction:
- Standard double glazing – the most affordable option, suitable for most homes
- Upgraded double glazing – better U-values, more heat kept in
- Triple glazing – the strongest performer on energy, and the one to choose if you’re applying for SEAI grants
- Acoustic glazing – cuts down road noise and external sound, worth it if you’re on a busy street
The SEAI requires windows to hit a U-value of 1.4 W/m²K or better. Triple glazing clears this comfortably.
What Happens During Casement Window Installation?
Step 1: Survey and Measurement
Before any order is placed, a Thermoglaze surveyor visits your home to take precise measurements and assess the existing frames. This is important – no two openings are exactly the same, and getting the sizing right at this stage avoids problems later.
Step 2: Manufacture and Lead Time
Once measurements are confirmed and your order is placed, your windows are manufactured to your specifications. Lead times vary depending on the frame material and glazing type chosen.
Step 3: Removal of Old Windows
On installation day, the existing windows are carefully removed. Good installers take care not to damage surrounding plasterwork, reveals, or decorative mouldings – particularly relevant in older Dublin properties.
Step 4: Fitting the New Frames
New frames are installed, levelled, and secured. Gaps are filled, sealed, and finished neatly. The quality of this stage makes a significant difference to thermal performance – even the best window underperforms if it’s not properly fitted.
Step 5: Final Check and Cleanup
The installer checks that every window opens, closes, locks, and seals correctly before leaving. Any debris is cleared and the work area is left tidy.
SEAI Grants for Window Upgrades in Dublin
If your existing windows are single-glazed or old double-glazed units from the 1980s or 1990s, you may qualify for support under the SEAI Better Energy Homes scheme. The grant applies to window replacements that meet the required U-value standard.
Grant amounts are updated periodically, so it’s worth checking directly with the Thermoglaze team or on the SEAI website for current figures. The team can advise on whether your planned upgrade qualifies and help you get the paperwork in order.
Why Choose Thermoglaze for Casement Windows in Dublin?
Thermoglaze is an Irish-owned company with two showrooms in Dublin – one northside, one southside. The range runs from entry-level uPVC through to high-spec alu clad and Internorm windows, so there’s something for most budgets and property types.
Every installation is backed by:
- ISO 9001:2015 certified quality standards
- Multi-point locking security on every unit
- Four glazing options across the range
- Finance options available through Humm
- A team that surveys, supplies, and fits – no subcontracting
You can see the full range of windows on the website or visit either showroom to see them working in person.
Visit Our Dublin Showrooms
Northside – Swords
Unit F2, Swords Enterprise Park, Feltrim Rd, Drinan, Swords, Co. Dublin, K67 WF72
Visit the Swords showroom
Southside – Rathgar
68 Rathgar Avenue, Rathgar, Dublin 6, D06 KN53
Visit the Rathgar showroom
Both locations have working window displays. You can open, close, and lock different models before making any decision. No appointment needed.
Conclusion
Casement windows are a practical, long-lasting choice for Dublin homes. They seal well, let in air when you want it, and come in enough material and glazing options to suit most properties and budgets. Whether you’re replacing draughty old frames or starting from scratch on a new build, the material you choose and the quality of the fitting both matter as much as the glass itself.
If you’d like to talk through your options, get a home survey, or request a quote, the Thermoglaze team is easy to reach.
📞 01 912 0600
🌐 www.thermoglaze.ie
📧 info@thermoglaze.ie
FAQs
1. What is the difference between a casement window and a sash window?
A casement window is hinged at the side and swings open, while a sash window slides up or down within the frame. Casement windows let in more air and close with a tighter seal.
2. Are casement windows a good fit for older Dublin properties?
Yes. Timber casement windows work particularly well on Victorian and Edwardian homes. They can be made to match original profiles while giving much better thermal performance than the windows they replace.
3. How long does installation take?
Most Dublin homes with five to eight windows can be done in one to two days, depending on the number of windows and the complexity of the job.
4. Do casement windows qualify for SEAI grants?
They can, provided the glazing meets a U-value of 1.4 W/m²K or better. Triple glazed units meet this without difficulty.
5. What’s the main difference between uPVC and aluminium casement windows?
uPVC costs less and performs very well on heat retention. Aluminium gives you slimmer frames, a more modern look, and tends to last longer over time. Both are low maintenance.
6. Can casement windows be fitted with trickle vents?
Yes. Trickle vents allow background airflow when the window is shut. They’re often required in new builds under Irish building regulations.
7. How secure are casement windows?
Thermoglaze casement windows include hinge claws and a multi-point shoot bolt lock as standard. This is a meaningful step up from older single-point lock windows.
8. Which glazing option is best for a home on a busy Dublin road?
Acoustic glazing reduces the amount of external noise that comes through. If you’re on a main road or near a flight path, it’s worth the extra cost.
9. Can I see the windows before buying?
Yes. Both the Swords and Rathgar showrooms have working displays you can try in person. It’s the best way to compare materials and finishes before deciding.
10. How do I get a quote for casement windows in Dublin?
Call 01 9120600, fill in the quote form at thermoglaze.ie, or drop into either showroom. A surveyor can arrange a home visit to measure up and put together a detailed quote.