Chartwell Green UPVC Window-design 38

Description

Chartwell Green uPVC Quad Fixed Light Window — The Widest View, The Highest Performance

When the opening is at its widest and the ambition for natural light is at its greatest, our Chartwell Green uPVC Quad Fixed Light Window is the definitive answer. Four full-height panes of A-rated double glazing span the entire width of a generous wall opening side by side — divided only by three slim structural mullions, bordered by a clean sculpted Chartwell Green frame, and uninterrupted by a single opening vent, handle, or hinge.

This is a window that transforms a wall into a view. It is the configuration for kitchen extensions that open onto large gardens, for open-plan living spaces where the connection between inside and out defines the character of the room, for new-builds and renovations where wide glazing is an architectural intention rather than an afterthought. At this scale and in this finish, a quad fixed light window is not simply a window — it is a considered design decision that changes how a room feels to be in.

Four Panes, No Interruption

The defining quality of a four-pane fixed window is the sheer continuity of glazing it provides. Unlike combination windows where opening vents, horizontal rails, and top lights divide the frame into visually separate zones, the quad fixed light runs uninterrupted from sill to head across the full width — four tall, clear panels of double glazing that the eye reads as a single wide expanse rather than a collection of individual panes.

The three slim mullions that divide the four panes are sized to the minimum structural requirement of the 70mm multi-chamber profile. At this width they register as a quiet vertical rhythm across the glazing — three evenly spaced reference points that give the composition its order without competing with the view beyond. From a seated position inside the room, the lower portion of all four panes is entirely clear of any frame element. From standing height, the full panoramic width of the opening is visible without obstruction.

The effect in a room facing a garden, a landscape, or an open aspect is genuinely transformative. Natural light enters from four directions simultaneously — from left, right, and centre — filling the room more evenly and more generously than any narrower window or any configuration with horizontal rails can achieve. The room does not have a window. The room has a view.

The Peak of Fixed Window Performance

A four-pane fixed window represents the highest achievable thermal performance within the uPVC casement window family — and the reason is structural rather than incidental. With no opening lights, no moving sashes, no compression seals between sash and outer frame, and no hinges creating localised stress points in the frame, there is nothing to degrade the thermal integrity of the window over time. Every seal is static. Every junction is permanent. Every element of the specification performs at its original standard indefinitely.

The 70mm multi-chamber uPVC frame maintains consistent thermal resistance across the full width of a four-light opening — including at the three internal mullions where lesser profiles create cold bridges. The 28mm argon-filled sealed units, soft coat low-E glass, and warm-edge black superspacer bar complete the specification — delivering a U-value of 1.3 W/m²K across all four panes without variation or degradation from the day of installation.

This double glazed uPVC window meets Part L Building Regulations across its full width and delivers sustained, measurable reductions in heat loss through what is typically the widest and most thermally significant glazed opening in the property. For extensions, orangeries, and open-plan spaces where wide glazing and high thermal performance must coexist, this quad fixed light configuration achieves both more completely than any alternative.

Scale, Proportion and the Chartwell Green Frame

A four-pane window at this scale makes one of the most architecturally significant statements of any window type. The relationship between the frame width, the pane proportions, the mullion spacing, and the head and sill dimensions all contribute to how the window reads on the elevation — and getting those proportions right at this scale requires a frame profile with genuine depth and detail.

Our fully sculptured 70mm profile delivers that detail. The moulded edges, the shadow lines at the mullions, and the precise geometry of the mitred corners give the frame a three-dimensional quality that flat or lightly profiled alternatives cannot match. At four panes wide, these qualities are amplified — there is more frame to read, more profile detail to register, and more opportunity for the sculpted Chartwell Green frame to define the character of the elevation.

In Chartwell Green, the three internal mullions create an evenly spaced rhythm across the width of the window that gives the composition a quiet architectural order. The soft sage tone of the frame sits against the clear glazing with a confidence that white uPVC cannot achieve — warm enough to give the window character, restrained enough to allow the view to dominate. These uPVC casement windows are the kind of feature that defines an elevation rather than simply occupying it.

The finish is co-extruded into the uPVC profile, permanently and inseparably part of the frame material itself. It cannot peel, fade, chip or discolour regardless of weather, UV exposure, or elapsed time. The 10-year profile guarantee covers the finish and the frame, and the practical maintenance requirement across the full width of a four-pane window is nothing more than an occasional wipe with a damp cloth.

Inherent Security Across the Full Width

Four full-height panes across a wide opening represent a significant glazed area, and the security specification matches the scale. All four panes are retained throughout by internal glazing beads — the glass cannot be pushed or levered out from the exterior on any section of the window, regardless of the size of the individual pane. The fixed outer frame, the three internal mullions, and the horizontal head and sill form a rigid welded uPVC structure with no gaps, no hinge points, and no sash-to-frame contact zones. There is nothing to force, nothing to lever, and no mechanical weakness to exploit across the full width of the frame.

Specification at a Glance

• Energy Rating: A-rated | U-value 1.3 W/m²K
• Configuration: 4-light — four full-height fixed panes side by side, no opening lights
• Frame System: 70mm multi-chamber thermally efficient uPVC
• Glazing: 28mm argon-filled units, soft coat low-E glass, warm-edge superspacer
• Hardware: None — fully fixed configuration
• Beading: Internal across all four panes for maximum security
• 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 available to discuss sizing, configuration, and whether a fully fixed specification is the right choice for your particular opening before you place your order.

The Window That Becomes the Room

There is a point at which a window stops being a feature of a room and starts being a defining characteristic of it — where the glazing is wide enough, the view clear enough, and the light generous enough that the room is understood through its window rather than the other way around. The quad fixed light window reaches that point. Four full-height panes of A-rated double glazing in a slim, sculpted Chartwell Green frame — no hardware, no interruption, no compromise between thermal performance and visual impact. It is the most expansive, most efficient, and most architecturally ambitious design in our entire Chartwell Green uPVC window range.