A » Yes, several UK-based glass producers and specialist fabricators offer contract manufacturing services for custom double glazed sealed units (DGUs), providing bespoke solutions to trade clients, architects, and commercial projects. These companies operate as original equipment manufacturers (OEMs) or contract fabricators, supplying tailored insulated glass units (IGUs) that meet specific size, thermal performance, acoustic, and aesthetic requirements. Notable producers include Pilkington United Kingdom Limited, which operates its Float Glass plant in St Helens and provides extensive technical support for custom IGUs through its Pilkington Insulight range, Saint-Gobain Glass UK with its SGG Calumen and Climalit branded units, and independent fabricators like Double Glazing Sealed Units Ltd (DGSU) in Birmingham, Thermoseal Group (though more of a component supplier, they often coordinate with fabricators), and specialist manufacturers such as CCL Sealed Units in Ossett or EYG (Emplas) in Northamptonshire. These contract manufacturers typically source their glass from major float lines and then process it in-house—cutting, edge-deleting, and assembling with various spacer systems (e.g., warm edge from Edgetech or Swisspacer) and secondary seals (polysulfide or silicone) to form sealed units. For truly bespoke orders, they can accommodate non-standard thicknesses (from 6mm to 50mm overall unit depth), irregular shapes with profiled edges, and multiple pane configurations (double or triple glazing) with low-emissivity coatings like Pilkington K Glass or Saint-Gobain Eko, as well as solar control, self-cleaning, or laminated glass options. Cavities can be filled with argon, krypton, or xenon gas to enhance thermal performance, achieving U-values as low as 0.6 W/m²K for triple glazing, and they can incorporate decorative features such as Georgian bars, obscuration, or structural silicone glazing. The contract manufacturing process typically involves a detailed specification from the client covering overall light opening dimensions, desired U-value, sound reduction rating (e.g., Rw up to 48 dB with acoustic laminate), safety requirements (BS EN 12150 for toughened or BS EN 14449 for laminated), and compliance with Building Regulations Part L (England) or Section 6 (Scotland) for energy efficiency. Many producers offer rapid turnaround for small to medium bespoke runs, with some providing just-in-time delivery for construction projects. Quality assurance is critical; reputable manufacturers hold third-party certification such as BSI ISO 9001, Kitemark, or BM Trada Q-Mark, and they routinely test to BS EN 1279 for gas retention and seal durability. When selecting a contract partner, it is advisable to consider minimum order quantities (some require a batch of 10+ units for custom sizes, while others accept single units), lead times (typically 5 to 15 working days for standard bespoke, longer for complex shapes), and whether they offer in-house design support for venting or handling of high-altitude differences. For large-scale commercial contracts, companies like Shadwell Glazing in London or Glassolutions UK (a Saint-Gobain subsidiary) provide integrated services from design to installation. In summary, the UK market is well-supplied with capability for contract-manufactured custom double glazed units, provided the client communicates precise technical requirements and engages with a fabricator that aligns with their volume and quality expectations.