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Glass & Glazing

Specialist glass and glazing systems engineered for performance — warmer rooms, quieter homes, safer openings and lower bills, year after year.

The Glass

Low-E Glass

Low-E (low-emissivity) glass has a microscopically thin metal-oxide coating applied to one surface — typically inside a sealed unit. The coating is invisible to the eye but acts like a one-way mirror for heat: it reflects long-wave thermal radiation (room heat) back into the building while letting short-wave solar daylight pass through normally.

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Low-E Glass
Reflects Heat, Welcomes Daylight
Why It Matters

Reflects Heat, Welcomes Daylight

The result is glazing that punches well above its weight on thermal performance. A standard double-glazed unit with a soft-coat Low-E layer can drop its centre-pane U-value to 1.0 W/m²K or below — pushing it firmly into A and A+ BFRC territory. It's now the standard specification on virtually every quality double or triple-glazed window we install.

  • Microscopic metal-oxide coating reflects heat
  • Drops U-values to 1.0 W/m²K or below
  • Soft-coat (best performance) or hard-coat options
  • Invisible to the eye — no visual difference
  • Standard in modern A and A+ rated units
  • Compatible with all our frame materials
Energy efficiency rating
Energy Rating

High-Performance Insulation

Low-E coatings can drop a double-glazed sealed unit's U-value to around 1.0 W/m²K or below — among the most thermally efficient glass options available. Triple-glazed units with multiple Low-E coatings achieve 0.7 W/m²K or lower.

How To Verify

Ask whether the unit uses soft-coat or hard-coat Low-E (soft-coat is the better performer inside a sealed unit), and look for an A or A+ BFRC rating on the finished window. Confirm the centre-pane U-value with the installer.

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Low-E Glass — common questions

Soft-coat (sputter-coated) Low-E gives the best thermal performance and is the standard for modern A-rated sealed units. Hard-coat (pyrolytic) Low-E is more durable and can be used as a single pane, but performs slightly less well thermally. Most quality double glazing uses soft-coat Low-E inside the sealed unit.
Not noticeably — modern Low-E coatings are designed to be virtually invisible, reducing visible light transmittance by only a few percent. Most customers can't tell the difference, even side-by-side with uncoated glass.
Standard Low-E coatings are optimised for retaining winter heat, but high-performance solar-control Low-E variants also block excess solar gain in summer — ideal for south-facing rooms, conservatories and large picture windows.
Yes — Low-E coatings add only a small premium to a sealed unit but dramatically improve U-values. The energy savings over the lifetime of the windows easily justify the cost, and it's now considered the bare minimum specification for any A-rated window.
Yes — Low-E coatings can be applied to toughened, laminated, frosted and patterned glass without any compromise on the coating's performance. We'll spec a combined unit at survey based on your priorities.
Some metallic Low-E coatings can slightly reduce mobile and Wi-Fi signal strength inside the building, particularly in well-sealed modern homes. If signal is a concern, mention it at survey and we'll recommend specifications that minimise the effect.

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