Chartwell Green UPVC Window-design 39

Description

Chartwell Green uPVC Wide Casement Window with Fixed Centre Lights — Expansive Glazing, Powerful Ventilation

For the widest wall openings — the kind found in large extensions, open-plan ground floors, and architecturally ambitious renovations — our Chartwell Green uPVC Wide Casement Window with Fixed Centre Lights delivers a scale of glazing and ventilation that no narrower window can approach. Six full-height panes of A-rated double glazing span the full width of the opening in a configuration that combines the unobstructed panoramic view of a wide fixed window with the full-height bilateral ventilation of a double casement — in a single, made-to-measure Chartwell Green frame.

This is not simply a wide window. It is a considered architectural solution for openings that demand the most complete balance of light, view, ventilation, thermal performance, and visual impact that uPVC window technology can currently deliver.

Six Lights, Two Functions

The logic of this configuration is immediately legible. The two outer casements handle all the ventilation. The four central fixed panes handle all the view. Each section does its job completely — and neither compromises the other.

The full-height side-hung casements on the far left and far right open outward to their full extent, creating two wide ventilation apertures at opposite ends of the frame simultaneously. When both casements are open, the effect on air circulation within the room is substantial — fresh air enters from both sides at every height level, warm air exits at the same rate from both ends, and the resulting cross-ventilation is thorough and even in a way that no centrally positioned opening can replicate. For large open-plan spaces, kitchen extensions, and wide living rooms where air can stagnate in the corners furthest from a single opening vent, this bilateral full-height ventilation arrangement makes a measurable difference to air quality and thermal comfort.

Between the two outer casements, four fixed panes span the central portion of the frame without interruption. The three slim mullions separating these central panes are kept as narrow as the structural requirements of the 70mm profile allow, minimising the visual division between panes and allowing the central glazed section to read as a single wide expanse of clear glass. At seated eye level — the height at which the view outside is experienced most directly — all four central panes are completely clear of any horizontal frame element. The panoramic view across the centre of the window is uninterrupted from left edge to right edge of the fixed section.

The transition from the outer casements to the inner fixed panes is handled by the frame geometry itself — the casement stile and the fixed frame outer mullion sit together at each side, creating a clearly defined boundary between the active outer sections and the passive central zone without adding visual complexity to the overall composition.

Full-Height Glazing at Maximum Width

The decision to run all six panes to the full height of the frame — with no horizontal rails, no top lights, and no fixed lower sections beneath the opening casements — is what gives this window its exceptional sense of openness. At this width, a horizontal rail would divide the elevation into upper and lower bands and reduce the perceived scale of both the window and the room it serves. Full-height glazing avoids this entirely, allowing the eye to read the full vertical extent of the opening as a single continuous plane of glass.

The effect from inside the room is of standing at the very edge of the outside. Natural light enters the room from a glazed width that few domestic windows can match, reaching deep into the interior and illuminating the ceiling and upper walls more effectively than any window with a restrictive horizontal rail. The garden, terrace, or landscape outside is not framed by the window — it is simply present, visible across the full width of the room at every height level simultaneously.

Thermal Performance Across the Full Width

Maintaining consistent A-rated thermal performance across a six-light frame at maximum width is a significant engineering requirement — one that cheaper profiles and lower-specification glazing systems fail to meet consistently. Our 70mm multi-chamber uPVC frame addresses it directly. The multiple sealed air chambers within the profile provide thermal resistance that is maintained at every section of the frame — outer casement stiles, central mullions, horizontal head and sill, and everywhere between — without creating cold bridges at the junctions between frame elements.

The 28mm argon-filled sealed units, soft coat low-E glass, and warm-edge black superspacer bar complete the thermal specification, delivering a U-value of 1.3 W/m²K across all six panes consistently. This double glazed uPVC window meets Part L Building Regulations across its full width and delivers genuine, sustained reductions in heat loss through what is typically the most thermally significant glazed opening in the property. For large extensions and open-plan spaces where wide glazing and energy efficiency must coexist, this specification achieves both without compromise.

Chartwell Green at Architectural Scale

A six-light window at this width occupies a significant portion of any elevation — and the character of the frame at this scale has a direct impact on the overall architectural quality of the property. Our fully sculptured 70mm profile delivers the depth, detail, and precision that a window at this scale demands. The moulded edges and shadow lines of the Chartwell Green frame give the mullions, the head, the sill, and the casement stiles a three-dimensional quality that flat profiles cannot approach. At six panes wide, these qualities accumulate across the full width of the frame, giving the elevation a composed, confident character that reads as quality from any viewing distance.

Chartwell Green — co-extruded into the uPVC profile and guaranteed not to fade, peel or discolour — brings warmth and heritage character to a window at this scale without competing with the expansive glazing it surrounds. The soft sage tone sits against the clear double glazing with a balance that white uPVC cannot achieve, giving the window a presence on the elevation that is immediately noticed and consistently admired. These uPVC casement windows carry a 10-year profile guarantee covering both frame and finish, and their maintenance requirement across the full six-pane width is nothing more than an occasional wipe with a damp cloth.

Security Across Six Panes

Both full-height outer casements are secured with independent multi-point locking systems that engage at multiple points along the full height of each opening light — not just at the handle — providing robust resistance to forced entry across the entire length of both opening edges. Lockable push-button handles are fitted to both casements as standard. All six panes across the full width of the frame are retained by internal glazing beads, preventing glass removal from the exterior on any section. The fixed central section — four panes in a rigid welded frame — provides no mechanical entry point of any kind.

Specification at a Glance

• Energy Rating: A-rated | U-value 1.3 W/m²K
• Configuration: 6-light — full-height side-hung casement left, four central fixed panes, full-height side-hung casement right
• 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 both outer casements
• Handles: Lockable push-button handles as standard
• Beading: Internal across all six panes for maximum security
• Gaskets: Patented double-action bubble gaskets on both casements
• 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 suitability, and specification details before you place your order.

The Ultimate Wide Opening Window

There is a category of wall opening that standard window configurations simply cannot fill adequately — too wide for a triple casement, too important for a compromise arrangement, too well positioned to accept anything less than the maximum in glazing, ventilation, and visual impact. This six-light wide casement with fixed centre lights was designed for exactly that category. Full-height glazing across the entire width. Powerful bilateral ventilation from both outer edges. An unobstructed panoramic view across four central fixed panes. And a sculpted Chartwell Green frame that gives the whole composition the architectural quality it deserves. It is the most complete, most capable, and most visually commanding design in our entire Chartwell Green uPVC window range.