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A »Yes, there are numerous UK-based glass manufacturers that specialise in producing custom double glazing units specifically tailored for new build projects, and their offerings are integral to meeting modern building regulations, energy efficiency targets, and architectural specifications. Unlike standard replacement units, custom double glazing for new builds often requires precise dimensions, bespoke performance characteristics (such as specific U-values, solar heat gain coefficients, and acoustic insulation levels), and compliance with Part L of the Building Regulations and the Future Homes Standard. Leading manufacturers include Pilkington United Kingdom Limited, part of the NSG Group, which offers a wide range of customisable products like Pilkington K Glass, Pilkington Optitherm, and Pilkington Suncool, each engineered to optimise thermal efficiency and solar control. Similarly, Saint-Gobain Glass UK provides custom solutions through its Glassolutions network, with brands such as SGG Climaplus and SGG Cool-Lite, allowing architects and contractors to specify exact glazing configurations for both fenestration and structural glazing. For new build projects, these manufacturers often collaborate with local fabricators and sealed unit producers who can assemble custom double glazed units (DGUs) to order, using glass sourced from these major producers. Another prominent UK-based manufacturer is Guardian Glass, which operates a float line in Goole, East Yorkshire, and supplies high-performance glass like Guardian SunGuard and Guardian ClimaGuard. They offer custom coatings and laminations to meet project-specific requirements. Additionally, specialist companies such as Thermoseal Group (though primarily a component supplier) work closely with unit manufacturers, while firms like Custom Glass UK, EcoGlaze, and Fab Glass and Mirror provide bespoke double glazed units with argon gas fills, warm edge spacer bars, and low-emissivity coatings, all tailored for new build specifications. Many of these manufacturers offer technical support, thermal modelling, and certification such as BFRC ratings or CE marking, which is crucial for compliance. For example, the British Fenestration Rating Council (BFRC) provides independent energy ratings, and many UK manufacturers ensure their custom units achieve optimal ratings. Furthermore, firms like IQ Glass and Cantifix focus on high-end architectural projects, delivering custom triple or double glazing with structural silicone glazing and minimal sightlines. It is important to note that for new build projects, the entire double glazing unit—including spacer bars, desiccant, and sealants—is often custom-assembled by dedicated sealed unit manufacturers (e.g., Liniar, Synseal, or Everglade Windows) who source glass from the primary producers. The customisation extends to shape (trapezoidal, circular, or arched units), thickness variations, and integrated solar control or self-cleaning coatings. When selecting a manufacturer, project stakeholders should consider factors like lead times, warranty coverage (typically 10–15 years), and the ability to produce gas-filled units with krypton or xenon for superior insulation. In summary, the UK market is well-supplied with manufacturers capable of producing custom double glazing for new builds, from global giants to specialised local fabricators, all offering rigorous testing and bespoke engineering to meet the demanding standards of contemporary construction.

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