Explore our premium architectural window lines engineered for exceptional thermal insulation, weather resilience, and structural integrity under UK climate conditions.
The United Kingdom fenestration market is undergoing a structural transition toward expansive horizontal openings that maximize natural daylight while satisfying rigorous thermal envelope requirements mandated by UK Building Regulations Approved Document L (2022 amendments). Central to this evolution is the XOX Sliding Window configuration—a sophisticated three-lite system characterized by an operable sliding sash flanked by two fixed end panes (Fixed-Operable-Fixed), or conversely, two sliding outer sashes over a central fixed pane (Operable-Fixed-Operable).
“XOX sliding window systems bridge the gap between traditional patio doors and expansive curtain walling. For UK procurement directors and facade engineers, they offer an unparalleled strength-to-weight ratio, achieving U-values down to 1.0 W/m²K while delivering panoramic 75%+ clear glass ratios without structural mullion clutter.”
— Engineering Specification Board, Global Fenestration StandardsIn contrast to standard two-panel XO or OX sliding windows, the 3-panel XOX configuration engineered by our factory provides key architectural and functional advantages specifically suited to UK residential extensions, multi-family housing projects, and commercial developments across England, Scotland, Wales, and Northern Ireland:
Featuring 24mm to 34mm multi-chambered polyamide (PA66 GF25) thermal barriers that eliminate thermal bridging, preventing interior condensation across chilly UK winter cycles.
Engineered with multi-point stainless steel shoot-bolt locks, anti-lift tracks, and toughened security glazing designed to withstand physical intrusion tests under UK standards.
Tested for extreme wind-driven rain protection (Class 9A / 600Pa), air permeability (Class 4 / 600Pa), and wind resistance (Class C5 / 2000Pa) for exposed UK coastal zones.
Compare our factory-direct XOX sliding window profile configurations against UK national standards for commercial and residential applications.
| Specification Parameter | UK Building Regs (Doc L Target) | XOX Thermal Break Aluminum | XOX Fusion-Welded uPVC | Compliance Status |
|---|---|---|---|---|
| Overall Window U-Value (Uw) | ≤ 1.2 W/m²K (New Dwellings) | 1.1 – 1.3 W/m²K (Double Glazed) | 0.9 – 1.1 W/m²K (Triple Glazed) | Exceeds Standard |
| Solar Heat Gain (SHGC / g-value) | 0.35 – 0.45 (Overheating Prevention) | 0.27 (LoĒ³-366 Triple Silver) | 0.32 (Low-E Argon Fill) | Doc O Compliant |
| Acoustic Performance (Rw) | 30 – 35 dB (Urban Standard) | 38 – 44 dB (Laminated Acoustic) | 36 – 40 dB (Dual-Pane Asymmetric) | Acoustic Grade |
| Air Infiltration Rating | Class 3 (600 Pa) | Class 4 (600 Pa Enclosed Seal) | Class 4 (600 Pa Welded Corner) | A1 Tightness |
| Security Rating | PAS 24:2022 Mandatory | Multi-Point Shoot-bolt Lock | Internal Bead Steel Reinforced | SBD Approved |
| Profile Wall Thickness | BS EN 12608 Class A | 2.0mm – 3.0mm Architectural Grade | 2.8mm – 3.2mm Heavy Wall Extrusion | Structural Tier 1 |
From 3-panel XOX horizontal sliders to stack units and casement combinations, every frame is custom-extruded to exact structural dimensions.
Tailored structural configurations engineered for specific regional wind zones, local heritage microclimates, and urban density demands.
Locations: Cornwall, Scottish Highlands, Pembrokeshire, Norfolk Coast.
Engineering Focus: Severe weather tightness, Marine-grade Qualicoat Class 2 powder coating (resisting salt-spray corrosion), marine stainless steel roller bearings, and heavy-duty EPDM triple weatherstripping capable of handling gusts over 100 mph.
Locations: Greater London, Central Manchester, Birmingham Canal Corridor.
Engineering Focus: Acoustic suppression profiles incorporating asymmetric dual glazing (6mm + 8.8mm acoustic laminate) reducing street and rail noise. Slim 35mm interlock sightlines to maximize daylight in space-constrained urban plots.
Locations: Build-to-Rent (BTR) towers, hotel retrofits, student accommodation.
Engineering Focus: High-cycle durability hardware tested to 50,000 opening cycles. Integrated restrictors for child safety compliance, standardized palletized delivery directly to site hoists, and BS 476 fire resistance glazing options.
Unlike third-party fenestration brokers or regional assembly shops, our factory maintains total vertical integration over the entire production lifecycle. From raw aluminum ingot extrusion and precision thermal-break assembly to insulated glass unit (IGU) fabrication and automated fusion-welding, we eliminate intermediary margin markups while guaranteeing strict tolerance adherence.
Our uPVC profile lines utilize 100% virgin vinyl resins without reground post-consumer scrap content. This prevents discoloration, UV yellowing, or frame brittleness under harsh weather exposure, guaranteeing structural elasticity for over 30 years.
All vinyl XOX sashes and outer frames are fused at 240°C using multi-head automated welders to create monolithic water-tight corners. This eliminates corner joint mechanical leakage common in screwed aluminum or lower-tier PVC assembly.
We provide over 200 architectural RAL colors including UK architectural favorites like RAL 7016 Anthracite Grey, RAL 9005 Jet Black, and Agate Grey, alongside authentic timber-grain foil laminates (Renolit) for conservation area projects.
Orders are packaged with heavy-duty corner guards, shrink-wrapped on reinforced steel or wooden pallets, and loaded into 20ft/40ft HQ shipping containers with direct freight routing to major UK ports including Felixstowe, Southampton, Liverpool, and London Gateway.
Get clear, authoritative technical answers regarding lead times, custom sizing, regulatory compliance, and installation support.
Yes. Our XOX sliding windows can be configured with argon-filled, warm-edge spacer double glazing or triple glazing incorporating Low-E coatings (such as LoĒ³-366) to achieve whole-window U-values down to 1.1 W/m²K for double glazing and 0.85 W/m²K for triple glazing. This comfortably surpasses the UK Document L requirement of ≤ 1.2 W/m²K for new dwellings and replacement glazing.
Because we extrude profiles in-house, we manufacture XOX units to millimetre precision (or 1/8-inch increments). Standard overall frame widths for XOX 3-panel configurations range from 1,800mm up to 6,000mm in width, with heights up to 2,800mm per unit. Custom structural reinforcement mullions are integrated for large-span commercial installations exposed to high wind loads.
Our XOX sliding windows feature heavy-duty multi-point shoot-bolt locking hardware along the sliding interlock, anti-lift security blocks in the head and sill tracks, stainless steel locking keeps, and internally beaded glazing stops. When fitted with 6.4mm or 8.8mm laminated safety glass, the complete assembly complies with PAS 24:2022 security standard requirements.
Typical fabrication lead time is 15 to 25 working days depending on order volume and custom finish specifications (e.g. dual-color powder coating or specialized laminated glass). Ocean freight transit from our factory port to main UK container hubs (Felixstowe / Southampton / Liverpool) generally requires 22 to 28 days. Full door-to-door DDP (Delivered Duty Paid) logistics can be arranged upon request.
We provide a comprehensive Limited Lifetime Warranty covering the structural vinyl/aluminum extrusions against cracking, warping, or corrosion. Insulated glass sealed units carry a 10-to-15 year seal failure warranty, while moving hardware (rollers, locks, handles) carries a 5-to-10 year replacement warranty.
Send your window schedule, CAD architectural drawings, or bill of quantities directly to our engineering desk. We provide comprehensive line-by-line thermal estimations, structural wind-load checks, and factory-direct wholesale pricing within 24 hours.
