Retro glazing older character homes often means sacrificing original glass and delicate features like astragals and lead-light windows. The EVS Triple Retro glazing system changes that. It installs a double-glazed unit to the outside of existing panes, preserving the original glass and character details intact. The result: authentic appearance retained, installation time reduced, and thermal and acoustic performance dramatically improved.

Why it’s the right choice for character homes

  • Preserve heritage: Original panes, leadlights and mouldings remain untouched. No need to remove or alter historic glazing.

  • Fast, non-invasive fit: External addition avoids dismantling.

Single glaze house, before picture double glazing

EVS Triple Retro Glazing

After photo of EVS Clip on Triple glazing. Retro fit double glazing. Warm home.
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Curved window retro fit double glazing. Warm home.

Preserving HIstory

With Modern warmth

Diagram of EVS Triple Retro Glazing window system showing weather protection, UV protection, retains character, low maintenance PVCu, increased insulation, noise reduction, cost effectiveness, condensation reduction, and ventilation features. The window includes optional glazing units, with arrow indicators for outward and inward ventilation, and a representation of the glass layers labeled "Low E" and "Double." The diagram highlights the thermal pumping's role in moisture removal.
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Goldies Glass

Thermal Resistance

Diagram of a timber window showing glass thickness, frame, and window details with star rating scale. 
Single-glazed windows have a relatively low insulation value R0.19), which allows heat to escape more easily than insulated glazing. This can result in colder indoor temperatures, higher energy costs, and increased condensation, particularly in poorly ventilated areas. During winter, single glazing can also create cold spots and draughts, reducing the overall comfort of your home or workplace.
Diagram of EVS Triple Retro Glazing with labels showing existing glass, new IGU, thermal pumping, existing window, and frame, alongside stars indicating thermal performance ratings from 10 to 60. 
Standard double glazing provides a significant improvement in thermal performance over single glazing, with an insulation value R0.45. This is considerably higher than standard aluminium-framed double glazing (approximately R0.26), helping to reduce heat loss, minimise condensation, and improve indoor comfort. It also allows natural sunlight to warm your home, making it an excellent choice for a warmer, more energy-efficient living environment.
A diagram of EVS Triple Retro Glazing window with labels showing glass, thermal pumping, existing window, and uPVC frame. The background is red with yellow stars marked with numbers from 10 to 60 and a yellow badge indicating first performance in retro glazing. 
Low-E argon double glazing offers the highest level of thermal performance for retrofitted windows, with an insulation value R0.59. The Low-E coating and argon gas work together to reduce heat loss in winter while helping to limit unwanted heat gain in summer. This provides superior energy efficiency, improved year-round comfort, and reduced condensation, making it the premium choice for homeowners looking to maximise the performance of their existing windows.