Choosing the right windows for your home is about far more than looks. The direction your windows open affects how easy they are to clean, how safe your family is, how well your home holds heat, and even how much street noise you let in. With Ireland’s wet and windy climate, getting this decision right matters more here than almost anywhere else.
At Thermoglaze – one of Ireland’s leading windows and doors installers – we get asked this question every week. So in this guide, we break it all down: what inward and outward opening windows actually are, the honest pros and cons of each, and which type tends to work best for Irish homes.
What Are Inward Opening Windows?
Inward opening windows do exactly what the name says – the sash swings inward into the room when opened. This style is enormously popular across continental Europe and has been gaining ground in Ireland over the past decade, particularly in new builds and renovation projects.
One of the most sought-after versions is the tilt and turn window, which gives you two opening modes in one frame. Turn the handle one way and the top of the sash tilts inward slightly for ventilation – ideal for wet Irish days when you want fresh air without rain coming in. Turn the handle the other way and the full sash swings open inward like a door, giving you maximum airflow and easy access for cleaning.
What Are Outward Opening Windows?
Outward opening windows – most commonly casement windows – push open away from the house. This is the traditional style found in older Irish homes and is still very widely used. Casement windows are hinged on one side and swing outward, often with a stay bar to hold them in place at different widths.
Differences: A Head-to-Head Comparison
1. Cleaning and Maintenance
This is where inward opening windows win hands down – especially in Ireland where two-storey homes are the norm.
- With inward opening windows, you can reach both sides of the glass from inside the room. No ladders, no scaffolding, no professional window cleaners needed.
- Outward opening casement windows require external access to clean the outside pane properly – awkward and sometimes unsafe on upper floors.
If ease of maintenance is high on your list, inward opening windows from Thermoglaze are the practical choice.
2. Security
Both window types can be made highly secure, but inward opening windows have a structural advantage:
- The locking mechanism on an inward opening window presses the sash against the frame when locked, making it very hard to force open from outside.
- Outward opening casements, while also lockable, rely on external hinges that can be a target for determined intruders.
- Thermoglaze’s alu-clad windows feature multi-point locking systems that offer superior security for Irish households.
3. Energy Efficiency
Ireland’s climate demands windows that keep heat in and cold out. Here’s how both types compare:
- Inward opening windows create a compression seal when locked – the harder the wind blows, the tighter the seal becomes. This makes them naturally well-suited to exposed Irish sites.
- Outward opening casements can also achieve high thermal ratings, particularly when fitted with quality double or triple glazing.
- If your home is eligible for an SEAI windows and doors grant, upgrading to high-performance windows of either type could save you significant money on heating bills.
4. Ventilation Control
- The tilt function on a tilt and turn window lets you bring in fresh air while keeping rain out – a feature that suits Ireland’s changeable weather perfectly.
- Casement windows let in good airflow when fully open but offer no halfway option on wet days without rain getting in.
5. Space Considerations
- Inward opening windows require a small amount of clear space inside the room – furniture placed too close to the window frame can obstruct them.
- Outward opening casements are better where interior space is tight, such as in narrow hallways or behind fitted furniture.
- If you’re tight on interior space, vertical slider windows or casement windows may suit better.
6. Aesthetics and Design Options
Both styles come in a wide range of materials, colours, and finishes. Thermoglaze carries:
- Inward opening alu-clad windows – timber core with aluminium exterior, combining warmth inside with weatherproofing outside
- uPVC windows – cost-effective, low maintenance, available in many colours
- Aluminium windows – slim profiles, modern look, excellent durability
- Timber windows – traditional Irish character with superb insulation properties
Which Type Is Better for Irish Homes?
The honest answer is: it depends on your home, but inward opening windows have clear advantages for most modern Irish properties. Here’s a quick summary to help you decide:
- Choose inward opening windows if you want easy cleaning from inside, maximum draught-proofing on exposed sites, a tilt-and-turn ventilation option, or a contemporary European-style look.
- Choose outward opening casements if you have limited interior space near the window, you’re replacing windows in a period home and want to keep a traditional look, or you’re working to a tighter budget.
For new builds, extensions, and full window replacements, the team at Thermoglaze frequently recommends inward opening alu-clad windows for their combination of performance, low maintenance, and long-term value.
Why Choose Thermoglaze?
Thermoglaze is a proudly Irish-owned business with showrooms in Swords and Rathgar. We supply and install windows and doors across Dublin and the surrounding counties, working with homeowners, architects, and builders on everything from single window replacements to full new-build projects.
- ISO 9001:2015 certified – quality you can trust
- Specialists in alu-clad windows, Internorm windows, and uPVC windows
- Flexible finance options available through Humm Finance
- SEAI grant support – we can guide you through the 2026 SEAI grant process
- Transparent, no-pressure quotes – get yours free today.
Visit Our Showrooms
Northside – Swords:
Unit F2, Swords Enterprise Park, Feltrim Rd, Drinan, Swords, Co. Dublin, K67 WF72
Southside – Rathgar:
68 Rathgar Avenue, Rathgar, Dublin 6, D06 KN53
📞 019120600 | 🌐 www.thermoglaze.ie | ✉ info@thermoglaze.ie
Conclusion
Both inward and outward opening windows have their place in Irish homes, but for most homeowners looking for long-term performance, easy upkeep, and strong energy efficiency, inward opening windows offer the better all-round package. The ability to clean both sides from inside, combined with excellent draught-sealing and the flexible tilt-and-turn ventilation option, makes them particularly well suited to Irish weather and modern living.
If you’re still unsure which direction is right for your home, the best next step is to talk to someone who knows windows inside and out. The team at Thermoglaze offers free, no-obligation consultations and quotes. Call us on 019120600 or visit one of our showrooms in Swords or Rathgar to see the full range for yourself.
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FAQs
1. Are inward opening windows more secure than outward opening windows?
Yes, in most cases. Inward opening windows compress against the frame seal when locked, which makes them harder to force open from the outside. When fitted with multi-point locking systems – as all Thermoglaze inward opening windows are – they provide an excellent level of security for Irish homes.
2. Are inward opening windows harder to clean than casement windows?
The opposite is true. Because the sash opens into the room, you can reach and clean both the inner and outer pane from inside the house. With outward opening casement windows on upper floors, you need external access to clean the outside glass properly.
3. What is the difference between a tilt and turn window and a standard inward opening window?
A tilt and turn window has two modes: tilt the top of the sash inward slightly for ventilation, or swing the full sash open inward like a door. A standard inward opening window only opens fully in one direction. Tilt and turn is often preferred for the extra ventilation flexibility it provides.
4. Do inward opening windows let in rain?
When in tilt mode, the window opens at a slight angle at the top, which limits rain entry considerably. When fully open in turn mode during heavy rain, some rain can come in just as it would with any open window. The tilt function is specifically designed for ventilation in wet conditions.
5. Can I get inward opening windows in uPVC, aluminium, or timber?
Yes. Thermoglaze offers inward opening windows in several materials. Our most popular for this style are alu-clad windows – timber on the inside for warmth and character, with a durable aluminium exterior that handles Ireland’s weather with ease. We also supply uPVC windows and aluminium windows.
6. Are inward opening windows suitable for period or older Irish homes?
They can be, yes. The alu-clad range in particular can be manufactured in traditional colours and profiles that complement older properties. Our team can advise on what will work visually for your specific home – just call us on 01 912 0600 or visit one of our showrooms.
7. Do I need to keep furniture away from inward opening windows?
You need a small clearance inside the room – typically the depth of the sash (around 100–150 mm) – to allow the window to swing open fully. Furniture or curtain rails placed too close can block the opening. It’s worth factoring this into your room layout when planning a window replacement.
8. Can I get a grant for new windows in Ireland in 2026?
Yes. The SEAI (Sustainable Energy Authority of Ireland) offers grants for energy-efficient window upgrades. The amount available depends on the type of glazing and your home’s energy rating. Thermoglaze can guide you through the process – visit our SEAI grant page for full details.
9. How long does installation of inward opening windows take?
For most homes, a full window replacement takes one to two days depending on the number of windows and the complexity of the job. Our installation team works cleanly and efficiently, and we aim to cause minimal disruption to your home.
10. Where can I see Thermoglaze inward opening windows on display?
You can see our full window range – including inward opening alu-clad windows – at either of our Dublin showrooms. Our Swords showroom is located at Swords Enterprise Park and our Rathgar showroom is at 68 Rathgar Avenue, Dublin 6. Call ahead on 01 912 0600 to arrange a visit.