Description
Chartwell Green uPVC Triple Top-Hung Casement Window — Panoramic Views, Exceptional Airflow
When a wall opening is wide enough to demand a window that genuinely commands attention, our Chartwell Green uPVC Triple Top-Hung Casement Window rises to the occasion. Six panes of thermally efficient double glazing — three independently operated top-hung vents above three generous fixed lower lights — span the full width of the opening in a design that is as practical as it is visually impressive.
This is a window for spaces that need to work hard. Open-plan kitchens and dining rooms where cooking smells and steam need somewhere to go. Large living spaces that face the garden and deserve a view to match. Extensions and orangeries where the connection between inside and out should feel seamless. Wherever wide glazing, even ventilation, and a strong exterior presence all matter, this six-light configuration delivers.
Three Vents, One Continuous Flow
The defining feature of this window is its triple top-hung vent arrangement. Unlike a design with a single vent positioned at one side of the frame, the three vents here are evenly spaced across the full width — meaning warm air can escape simultaneously from the left, centre, and right of the opening. The effect on air circulation within the room is immediate and noticeable. Fresh air is drawn in more uniformly, warm stale air exits more efficiently, and the overall ventilation is far more balanced than any narrower window could achieve.
Each vent opens independently outward from its top edge, tilting away from the frame to create a ventilation gap at the head of each pane. The top-hung opening action is inherently rain-resistant — the back of the open vent acts as a natural deflector, channelling water away from the opening rather than into the room. All three vents can be left open in light rain, during overcast weather, or overnight without any concern about water ingress.
Below the vent rail, three full-height fixed panes span the lower two-thirds of the frame without interruption. No horizontal rails. No visible hinges. No handles breaking the sightline. Just clear, A-rated double glazing framed in sculpted Chartwell Green uPVC, delivering an unbroken panoramic view across the full width of the window.
Thermal Efficiency at Scale
Maintaining consistent thermal performance across a wide, multi-light frame is a genuine engineering challenge — and one that cheaper profiles fail to meet. Our 70mm multi-chamber uPVC frame system is designed specifically for this. The multiple air chambers within the profile create layers of thermal resistance that work consistently whether the frame is narrow or wide, whether the section is glazed or structural.
Combined with 28mm argon-filled sealed units, soft coat low-E glass, and a warm-edge black superspacer bar, this double glazed uPVC window achieves a U-value of just 1.3 W/m²K across its entire width — genuinely A-rated performance that holds at the frame edges and at the glass centre equally. Part L Building Regulations are met comfortably, and the impact on your heating bills is real and measurable, especially across a wider opening where heat loss potential is greatest.
Wide-Format Aesthetics in Chartwell Green
A six-light window at this width makes a significant architectural statement. The proportions matter — the ratio of vent height to fixed pane height, the thickness of the horizontal rail, the spacing of the vertical dividers — and our fully sculptured 70mm profile handles all of these with the kind of refinement you’d expect from quality timber joinery, at a fraction of the maintenance cost.
In Chartwell Green, the horizontal emphasis of this design is particularly striking. The three vents create a repeating rhythm across the top of the frame, the slim vertical dividers between the fixed lower panes maintain a sense of openness, and the soft sage colour ties the whole composition together against brick, render, stone or cladding alike. These uPVC casement windows look as though they were designed specifically for the property they’re fitted in — because the proportions and finish give them that quality.
The Chartwell Green finish is co-extruded into the uPVC profile itself, making it completely resistant to peeling, fading, discolouration and warping. No maintenance schedule. No repainting. No deterioration. Just a consistent, heritage-quality finish backed by a 10-year profile guarantee.
Security Across Every Light
All three top-hung vents are independently secured with multi-point locking systems and fitted with lockable push-button handles as standard. The three fixed lower panes are retained throughout by internal glazing beads — the glass cannot be removed from the exterior on any section of the window. Patented double-action bubble gaskets run the full perimeter of each opening vent, maintaining a tight, draught-proof weather seal against wind and rain in all conditions.
Specification at a Glance
- Energy Rating: A-rated | U-value 1.3 W/m²K
- Configuration: 6-light — three top-hung vents above three full-height fixed lower panes
- Frame System: 70mm multi-chamber thermally efficient uPVC
- Glazing: 28mm argon-filled units, soft coat low-E glass, warm-edge superspacer
- Locking: Multi-point locking on all three top-hung vents
- Handles: Lockable push-button handles as standard
- Beading: Internal throughout for maximum security
- Gaskets: Patented double-action bubble gaskets
- Finish: Chartwell Green — guaranteed not to discolour, warp or peel
- Compliance: Part L Building Regulations
- Guarantee: 10-year profile guarantee
Made to Your Exact Measurements
- Frame Width: 415mm – 700mm
- Frame Height: 800mm – 2200mm
Every window is manufactured to order to your precise dimensions. Enter your measurements at checkout for a perfect made-to-measure fit across the full width of your opening. Our team is on hand for any sizing queries before you order.
The Statement Window for Wide Wall Openings
When the opening is wide, the room is large, and the view deserves to be seen in full, this triple top-hung configuration is the definitive choice. Three independently operated vents give you more control over ventilation than any narrower window can offer. Three full-height fixed lower panes give you an unbroken panoramic outlook across the entire width of the frame. And the Chartwell Green finish ensures the whole window makes exactly the right impression on your home’s exterior — now and for decades to come. It is the widest, most capable, and most visually commanding design in our Chartwell Green uPVC window range.
