A Smarter Approach to Double Retro Glazing

Single glaze house, before picture double glazing. Heritage building

The EVS Double Retro Glazing system has been engineered to deliver outstanding thermal performance, long-term durability, and a premium finish while preserving the character of your existing timber windows.

At the heart of the system is an innovative aerated PVC glazing bead that securely holds the double-glazed unit in place. Its slim, low-profile design creates a clean, refined appearance that blends seamlessly with traditional timber joinery.

After photo of EVS Clip on Triple glazing and double glaze retro fit . Retro fit double glazing. Warm home. Heritage home. Victorian building.
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After photo of EVS Clip on Triple glazing and double glaze retro fit . Retro fit double glazing. Warm home. Heritage home. Victorian building.

Every EVS installation follows industry best practice, with correctly specified glazing units, precision glazing blocks, and accurate edge clearances to ensure optimum performance and reliability.

What makes EVS different is its unique ventilated glazing bead design. Integrated air vents promote continuous airflow around the glazing unit, helping moisture escape naturally from the glazing cavity.

Unlike conventional systems that rely primarily on drainage holes, the EVS system encourages ongoing air circulation to reduce trapped moisture before it can lead to timber rot, condensation issues, or glazing panel failure. This innovative approach helps protect both your windows and your investment for years to come.

Engineered to Last

Diagram showing EVS double retro glazing window with features like weather protection, UV protection, character retention, low maintenance PVCu, and benefits such as increased insulation, noise reduction, cost effectiveness, and condensation reduction; includes optional low E and double glazed units.
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Unlike traditional timber glazing beads, the EVS PVC profile can be cut, pinned, and painted to match your existing joinery, yet it will not absorb moisture, swell, warp, twist, or split over time. The result is a low-maintenance, long-lasting glazing solution that continues to perform year after year.

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Thermal Resistance

Diagram showing timber frame window with single glazing, 4mm thick glass, and existing window and glass, rated R0.19 and marked with a single yellow-outlined red star rated 10. 
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 Double Retro Glazing window showing components like replacement glass, vented edge cavity, existing window, new IGU, uPVC glazing beads, and glass thickness options from 10 to 60mm. 
The EVS Double Retro Glazing fitted with standard glazing provides a significant improvement in thermal performance, with an insulation value of R0.36. 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 is also ideal for allowing natural sunlight to warm your home, making it an excellent choice for a warmer, more energy-efficient living environment.
Diagram of a double glazed window with labels showing components such as replacement glass, vented edge cavity, existing window, new IGU, uPVC glazing beads, and glass thickness options from 4/8/4 to 4/8/4. The background features a color gradient with star ratings from 10 to 60. The text highlights EVS Double Retro Glazing with a model number RO.53 and describes retro timber low-E double glazing. 
The EVS Double Retro Glazing fitted with Low-E argon panels provides top-performing thermal performance for retrofitted window solutions, with an insulation value of R0.53. 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 enhanced energy efficiency, improved year-round comfort, and reduced condensation, making it an excellent choice for homeowners looking to maximise the performance of their existing windows.