The UK’s window and door market continues to navigate tightening Building Regulations, evolving Window and Door Energy Ratings, and a growing expectation for lower embodied carbon. Against this backdrop, Saint-Gobain Glass has unveiled PLANITHERM® NEO, a next-generation low-emissivity (low-E) glass engineered for both double and triple-glazed units.

Positioned as a single stock solution, PLANITHERM® NEO seeks to reconcile three pressures that rarely align neatly: thermal performance, optical neutrality and measurable sustainability credentials.

Thermal metrics without aesthetic compromise

At centre pane level, PLANITHERM® NEO achieves a U-value of 1.0 W/m²K in a standard 4-16-4 double-glazed configuration with 90% argon fill (coating on face 3), and as low as 0.5 W/m²K in a 4-16-4-16-4 triple-glazed build-up with 90% argon (coatings on faces 3 and 5).

Solar control remains carefully balanced rather than aggressively reduced: a g-value of 54% in double glazing and 42% in triple glazing is designed to support favourable energy ratings while still permitting useful passive solar gain — a critical consideration in temperate UK climates.

Crucially, the coating has been formulated to deliver a more neutral appearance, lower external reflection and high light transmission. This is particularly relevant in triple glazing, where cumulative coatings can introduce perceptible tint or reflectivity. For architects, façade consultants and discerning homeowners, optical clarity is no longer a secondary concern; it is integral to perceived quality.

A single product for double and triple glazing

One of the more pragmatic aspects of PLANITHERM® NEO is its consolidation of specification. By functioning as a single stock product suitable for both double and triple glazing — in annealed or toughened form — it simplifies inventory management and production planning for processors.

The coating retains its technical and visual characteristics after toughening to BS EN 12150, an important detail for fabricators supplying doors, larger panes or safety-critical applications. In a supply chain still mindful of efficiency and margin protection, this reduction in SKU complexity is strategically significant.

Circularity as standard, not afterthought

Sustainability claims are now ubiquitous in glazing literature; the differentiator lies in transparency and verification. PLANITHERM® NEO incorporates up to 40% reclaimed and remanufactured pre- and post-consumer glass, enabled through Saint-Gobain’s Glass Forever programme. The approach targets reduced raw material extraction, lower energy consumption and diminished embodied carbon — supported by Life Cycle Assessment data and an Environmental Product Declaration.

For specifiers working on public sector or mixed-use schemes where environmental reporting is mandatory, such documentation moves the product beyond marketing narrative into measurable compliance territory.

Supporting the heat-pump transition

As UK homes increasingly shift towards low-carbon heating systems such as air-source heat pumps, the fabric performance of the building envelope becomes more critical. PLANITHERM® NEO’s balance of insulation and controlled solar gain is intended to mitigate overheating risk while maintaining winter heat retention, reducing reliance on mechanical cooling and excessive ventilation strategies.

The glass is suitable across residential new build, refurbishment and mixed-use projects, including sliding and bifold doors, and can be specified in laminated formats to enhance security, acoustic attenuation and UV protection. It can also be combined with other functional coatings within the Saint-Gobain portfolio to create multi-performance glazing assemblies.

A market recalibration

Rather than representing a radical aesthetic shift, PLANITHERM® NEO reflects a broader recalibration of priorities in the UK glazing sector: higher thermal baselines, neutral visual performance and credible circularity.

In a market where regulatory compliance is a given, differentiation increasingly lies in how seamlessly performance, appearance and sustainability coexist within a single specification line. PLANITHERM® NEO appears designed precisely for that convergence.