Double Glazing Unit Types

Our most popular and cost-effective option. Standard double glazed sealed units feature two panes of clear float glass separated by a warm-edge spacer bar, with an air or argon gas fill for improved thermal insulation. Available in a wide range of standard and bespoke sizes, manufactured to BS EN 1279 standards. Ideal for straightforward replacements and new installations where specialist glass is not required.

Superior thermal and acoustic performance with three panes of glass and two gas-filled cavities. Triple glazed units achieve significantly lower U-values than standard double glazing, making them the ideal choice for new builds, Passivhaus projects, and energy-efficient refurbishments aiming to exceed Building Regulations Part L requirements. Available with Low-E coatings and argon or krypton gas fills for maximum efficiency. BFRC energy rated.

Manufactured to BS EN 12150 standards, our toughened safety glass is up to five times stronger than standard annealed glass. When broken, it shatters into small, relatively harmless granules rather than dangerous shards. Required under UK Building Regulations for critical locations including doors, side panels, low-level glazing (sill height below 800mm), and areas adjacent to baths or showers. Each pane carries a permanent BS EN 12150 kitemark stamp.

Low-E glass features a microscopically thin metallic coating that reflects radiant heat back into the room whilst allowing natural light to pass through. See our guide to glass types for a detailed comparison, dramatically reducing heat loss. We offer two types: soft-coat Low-E, applied in a vacuum process after manufacture, delivers the best thermal performance and must be used within a sealed unit; hard-coat Low-E, applied during manufacture, is slightly less efficient but more durable. Low-E units help meet Building Regulations Part L and improve your property's BFRC energy rating.

Specialist acoustic sealed units designed to significantly reduce external noise ingress – ideal for properties near busy roads, flight paths, railways, and urban centres. Acoustic units use asymmetric glass configurations (for example, 6mm outer pane and 4mm inner pane) to disrupt sound wave transmission more effectively than symmetric setups. Depending on the configuration, noise reduction of up to 40 dB or more is achievable. Can be combined with argon gas fill and Low-E coatings for thermal performance alongside acoustic benefits.

Privacy glass double glazing units available in all popular UK obscure patterns, including Stippolyte, Cotswold, Arctic, Contora, Digital, Flemish, and more. Obscure glass is rated on a scale of 1 (least obscure) to 5 (most obscure), allowing you to choose the right level of privacy for bathrooms, front doors, side panels, stairwells, and WCs. All patterns can be combined with toughened safety glass where required by Building Regulations. Manufactured to BS EN 1279 standards.

Low-maintenance double glazing units featuring a dual-action photocatalytic and hydrophilic coating on the outer pane. UV light breaks down organic dirt on the glass surface (photocatalytic action), and when it rains, water sheets evenly across the surface and rinses the loosened residue away (hydrophilic action). We supply units featuring Pilkington Activ self-cleaning technology – the UK's most trusted self-cleaning glass brand. Perfect for hard-to-reach windows, conservatory roofs, and skylights.

Decorative double glazing units that replicate the traditional appearance of period and heritage properties. We offer three bar styles: internal Georgian bars housed within the sealed unit cavity for a clean, low-maintenance finish; external Georgian bars applied to the glass surface for a more authentic look; and duplex bars combining both internal and external bars for the most convincing traditional appearance. Available in white, gold, woodgrain, and custom colours to match your existing frames.

Solar control double glazing units reduce excessive solar heat gain whilst maintaining high levels of natural daylight – solving the problem of overheating in conservatories, south-facing rooms, orangeries, and large glazed extensions. The spectrally selective coating reflects a proportion of the sun's infrared energy, keeping interiors cooler in summer without the need for blinds or air conditioning. Can be combined with Low-E coatings to retain heat during winter, delivering year-round comfort and compliance with Building Regulations Part L.

Fire-rated double glazing units designed to comply with UK Building Regulations Part B (fire safety). Available in two classifications: integrity-only (E) units prevent the passage of flames and hot gases for a specified period; integrity-plus-insulation (EI) units also limit heat transfer through the glass, protecting occupants on the non-fire side. Essential for communal areas, escape routes, boundary glazing, and compartment walls in both residential and commercial buildings. All units are tested and certified to the relevant BS EN standards.