Horizon Windows
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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.
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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 move to a smaller property, 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 show. Casement windows sit within our full uPVC Windows range, alongside the other styles we fit across Dublin.
Our window profiles can be configured to suit a wide range of property types, whether you’re planning a straightforward replacement or a complete renovation. uPVC casement windows open outward using either 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 looking for slimmer sightlines may prefer our aluminium casement windows range instead, which offers a similar casement style using a different frame material.
Standard colours available include:
Our A-rated window range helps reduce heat loss and improve energy efficiency while adding value to your home.
Multi-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 are designed to resist cracking, flaking and discolouration, helping to reduce maintenance requirements 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
Casement windows offer good energy efficiency because several design features work together rather than relying on a single component.
Superior Sealing: Unlike sliding windows, which operate along tracks, casement windows close tightly against their frames.
Reduced Infiltration: AÂ 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 coating on the glass helps reflect heat back into the room during winter and reduce unwanted heat gain during summer, improving thermal performance throughout 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.
Proper maintenance helps a uPVC casement window perform well for years, and the care required is minimal.
Clean the frames every few months with warm soapy water and a soft cloth or sponge. A specialised uPVC cleaner can help remove stubborn dirt. Avoid abrasive cleaners, as they can scratch the surface over time. Our guide on how to clean uPVC windows covers this in more detail.
For cleaning the glass, a standard household glass cleaner and a lint-free cloth are sufficient. Pre-washing heavily soiled windows with warm, soapy water helps remove grime before the final clean. Thoroughly drying the glass afterwards helps prevent streaks.
A new casement window frame can improve indoor comfort throughout the year by reducing draughts around the sash and potentially lowering heating bills during winter.
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 pull the sash tightly against the gasket, improving security and airtightness simultaneously. Multi-chamber uPVC frames provide additional insulating air pockets, helping to keep the edges of the glass warmer and reduce 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 become increasingly popular across Dublin in recent years, largely because of the flat, even appearance created when the sash closes against the frame. Our flush casement range is designed to suit various property styles, from period homes to modern builds.
A flush casement window is designed to maintain 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 are often a better choice when you want strong ventilation, good weather sealing, high energy efficiency, and simple operation.
Modern casement windows are not generally easy to break into, especially when they use multi-point locks, strong frames, and security-rated glazing.
Casement windows have a simple framed design with one or more hinged sashes that open outward, usually from the side like a door.
To secure casement windows, focus on the locks, hinges, glazing, and frame strength. A modern casement window should secure the sash at several points rather than relying on one handle or latch.
Yes. uPVC casement windows are available in a wide range of colours and finishes, so you are not limited to standard white.
Yes. Casement windows are generally effective at reducing draughts because the opening sash closes tightly against compression seals around the frame.
uPVC casement windows typically last around 20 to 35 years, depending on the quality of the frame, glazing, hardware, installation, and exposure to weather.
Ireland’s weather often involves wind-driven rain, high moisture levels, and frequent temperature changes, so window sealing is especially important. Casement windows perform well because the sash closes firmly against compression seals around the frame.
Yes. Casement windows can be customised in size, frame material, colour, glazing, opening style, hardware, and decorative finish.
