The Glass Industry in Transformation

For most of its history, glass was a passive building material — it let in light, kept out weather, and stayed out of the way. That picture is changing rapidly. Driven by demand for more energy-efficient buildings, the growth of smart architecture, and increased investment in sustainable materials, the glass and glazing sector is experiencing some of the most significant innovation in its history.

Electrochromic "Smart" Glass

Electrochromic glazing can change its tint on demand in response to a low-voltage electrical signal. A building management system — or an occupant via an app or wall switch — can darken the glass to reduce solar glare and heat gain without the need for blinds or shading structures.

The technology works by passing a small electrical current through a thin electrochromic coating, triggering a reversible ion migration that changes the coating's optical properties. The glass can typically cycle from fully clear to a deep blue-grey tint in a matter of minutes.

Early smart glass was prohibitively expensive and limited to high-end commercial buildings. Costs have been falling steadily as manufacturing scales up, and electrochromic glazing is beginning to appear in premium residential projects and high-performance office fit-outs. Major manufacturers including Sage Glass (a Saint-Gobain company) and View, Inc. have been supplying large commercial installations for several years.

Photovoltaic (Solar) Glazing

Building-integrated photovoltaics (BIPV) in glass form — sometimes called solar glass — embeds thin-film photovoltaic cells within a laminated glass unit. The result is a facade element that simultaneously admits daylight, provides thermal insulation, and generates electricity from sunlight.

Current thin-film solar glass typically has lower electricity generation efficiency than conventional rooftop solar panels, but it replaces facade cladding or glazing that would otherwise have no energy-generating capability. As building regulations in many countries increasingly require net-zero or near-zero energy performance from new buildings, BIPV glazing is attracting significant developer interest.

Vacuum Insulated Glazing (VIG)

Vacuum insulated glass achieves extraordinary thermal performance by evacuating the air between two panes and maintaining a vacuum gap — the same principle as a thermos flask. With no gas to conduct or convect heat, VIG units can achieve U-values below 0.5 W/m²K at a unit thickness similar to conventional double glazing.

This is particularly significant for heritage building retrofits, where the slim profile of VIG allows high-performance glazing to be installed within historic window frames that cannot accommodate thick triple-glazed units. Several manufacturers — including Pilkington (NSG Group) and Panasonic — produce commercial VIG products, and the market is growing as costs come down.

Printed and Functional Glass

Digital ceramic frit printing on glass has transformed the possibilities for architectural glazing. High-resolution patterns, images, and designs can be permanently fired onto glass as a frit coating. Beyond aesthetics, printed frits serve a structural purpose on facades — controlling solar gain by reflecting a portion of sunlight before it enters the building.

A related development is the printing of bird-friendly patterns. Glass collisions are a significant cause of bird mortality, and ceramic frit patterns applied at appropriate spacing are now a standard specification requirement on many new commercial buildings in North America and parts of Europe.

Sustainability and the Circular Glass Economy

The glass industry is making measurable progress on sustainability. Flat glass is highly recyclable, and manufacturers are increasing their use of cullet (recycled glass) in furnace feeds, which reduces the energy required for melting. Electric and hydrogen-powered melting furnaces — which would dramatically reduce the carbon footprint of glass production — are under active development by the major float glass producers.

Lifecycle assessment (LCA) thinking is also reshaping how architects and specifiers select glazing. Products increasingly come with Environmental Product Declarations (EPDs) that quantify embodied carbon, enabling more informed specification decisions.

What to Watch

The trends to follow in the coming years include:

  • Continued cost reduction in electrochromic and photovoltaic glazing making them viable for mid-market projects.
  • Wider availability and standardisation of VIG products for both new build and retrofit.
  • Growing regulatory requirements for embodied carbon transparency driving demand for low-carbon glass manufacturing.
  • Expansion of AI-driven building management systems that optimise smart glass tinting in real time based on weather, occupancy, and energy pricing.

Glass has always been an expression of what a civilisation can build. In the 21st century, it's increasingly also an expression of what a building can do.