Horizon Windows
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Horizon Windows
60+ Google Reviews
From built-in wardrobes to bespoke kitchen designs, our sister company Horizon Bespoke Joinery crafts perfect storage solutions to complement your home interior.
Horizon Windows designs, supplies and installs uPVC casement windows for homes across Dublin.
10+ Years Guarantee
Fully Covered
Ongoing Support
Neat & Tidy Finish
Horizon Windows has been designing, supplying, and fitting uPVC casement windows across Dublin for more than 30 years, and every installation is backed by our experience and commitment to quality.
At Horizon Windows, we believe a window replacement should feel like a considered decision, not a rushed one. Whether it is your first home, an upgrade, or a downsize, getting it right depends less on the brand printed on the frame and more on whether the supplier fitting it understands how a casement window is built, sealed, and hung, which is where three decades of experience genuinely shows. Casement windows sit within our full uPVC Windows range, alongside the other styles we fit across Dublin.
Our window profiles can be combined to suit most property types, from a straightforward replacement to a full renovation or restoration project. uPVC casement windows open outward with either on a top or side hinge, with flexible casement window sizes are available to match your existing opening dimensions and provide a precise fit tailored to your home. Homeowners after a slimmer sightline may prefer our Aluminium Casement Windows range instead, which offers the same style with a different frame material.
Standard colours available include:
Our A-rated window range helps contain and conserve energy, whilst adding to your home’s value.
Multiple chambered uPVC frames, weather seals and triple glazing work together to reduce noise transfer.
Multi-locking systems and double-locking door handles are fitted as standard, part of the broader window and door security features built into every Horizon installation.
Our frames won’t crack, flake or discolour, reducing the maintenance your home requires over time.
Moving to A-rated windows can reduce heat loss through your windows by up to 70%.
Every installation is covered by our 10+ year guarantee.
Get an estimate for the casement windows you're considering.
Traditional
Modern
A casement window performs well in terms of energy efficiency because of several design features working together rather than one feature alone.
Superior Sealing: Unlike sliding windows, which rely on tracks that can loosen over time, a casement window cranks open and shut with a tight seal against the frame.
Reduced Infiltration: A strong seal on all four sides limits draughts. The home stays more stable through both winter and summer, which takes some of the load off heating and cooling systems.
Low-Emissivity (Low-e) Coating: An invisible layer on the glass reflects heat back inside in winter and outward in summer, balancing thermal performance across the year.
Warm Edge Spacers: These reduce heat transfer around the edges of the glazing unit, lowering energy loss and improving the window’s overall efficiency. This is part of the same insulation approach we apply across every window range.
Maintaining a uPVC casement window properly keeps it performing well for years and the routine involved is genuinely minimal.
Clean the frames every few months with warm soapy water and a soft cloth or sponge. A specialised uPVC cleaner is worth using on stubborn dirt, and abrasive cleaners are best avoided since they can scratch the surface over time. Our guide on how to clean uPVC windows covers this in more detail.
For the glass itself, a standard household glass cleaner and a lint-free cloth is enough. Pre-washing heavily soiled windows with warm soapy water first helps lift grime before the final clean and drying the glass thoroughly afterwards prevents streaking.
A new casement frame changes how a room feels throughout the year with fewer draughts at the sash and lower heating bill by the time winter’s out.
An all-round compression gasket presses against the frame on every side as the sash closes, limiting the draughts that sliding and double-hung windows often let through.
Multi-point locks then pull the sash tight against that gasket, improving security and airtightness in the same action. uPVC multi-chamber frames add a further layer of insulating air pockets, keeping the edge of the glass warmer and reducing condensation on colder days.
One of the main casement window benefits is improved year-round comfort, with windows that work quietly in the background by retaining warmth during colder months and helping maintain a comfortable indoor temperature.
Flush casement windows have grown in popularity across Dublin in recent years, largely for the flat, even line the sash forms against the frame once closed. Our flush casement range is built to suit the property it’s going into, whether that’s a period home or a modern build.
A flush casement window is designed to hold its energy efficiency, add a level of security and give the exterior of a home a cleaner line than a standard casement profile. Homeowners weighing up options for a period property or a contemporary build may also want to look at our Bay Windows, Tilt and Turn Windows, or Vertical Sliding Windows ranges.
Casement windows offer strong energy efficiency and ventilation, opening outward for a wider aperture and a tighter seal than sliding or double-hung alternatives.
No, modern casement windows are designed to provide strong security. Their tight-fitting sash, multi-point locking systems, and reinforced glass make forced entry much more difficult than with older window designs. For added protection, look for windows tested to security standards such as PAS 24, which checks how well the complete window system resists attempted break-ins.
Hinged on one side and opening outward like a door, typically with a single large pane that allows for an unobstructed view and more natural light.
A high-quality locking mechanism is the foundation, with window security pins and, where extra protection is wanted, a secondary key-operated lock as additional options.
Yes, uPVC casement windows are available in a variety of colours and finishes, allowing you to choose an option that matches your home’s exterior and interior style.
Yes, casement windows are one of the better window styles for reducing draughts because the opening part of the window closes tightly against the frame. Modern casement windows use weather seals and secure locking points to minimise gaps where cold air can enter. When properly fitted with quality glazing, they can help keep rooms warmer and reduce heat escaping through the window.
High-quality uPVC casement windows typically last around 25 to 30 years with proper installation and regular maintenance.
Yes, casement windows are well suited to Irish weather when properly specified and installed.
Their side‑hung, outward‑opening design presses the sash against the frame when closed, giving a tight seal against wind‑driven rain and drafts, which is important in Ireland’s damp, windy climate. With quality frames, factory draught seals, and correct installation, casement windows perform reliably across typical Irish conditions.
Yes, casement windows can be customised with different styles, colours, glazing options, and hardware to suit your property’s requirements.
Interested in upgrading your space?
Discuss your requirements with us today!
At Horizon, we work with you to understand your requirements and ensure your home looks exactly the way you want it.
Proudly part of the Horizon Construction family
Unit 2, Newtown Avenue,
Malahide Road Industrial Park, Dublin 17
D17 CA34
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