The CSG System – Secondary Glazing for Heritage & Listed Homes.
The CSG System.
Discreet Secondary Glazing for Heritage Sash and Case windows.
The CSG System is a discreet, purpose-designed secondary glazing solution created for traditional sash and case windows. Combining thoughtful design with quality craftsmanship, it has been developed to complement the character of period and heritage properties while integrating seamlessly with existing windows.
Designed with both appearance and practicality in mind, the CSG System offers a refined approach to secondary glazing, helping homeowners enhance their living environment without compromising the original features that make their property unique.
Carefully tailored to each installation, the system provides a sympathetic and unobtrusive addition to the home, making it suitable for a wide range of traditional and historic properties.
If interested in further specifications please check our our technical data sheet.
Why Heritage Homeowners Choose the CSG System?
The CSG System was designed with two key objectives in mind: delivering genuine thermal efficiency and draught proofing, while remaining as discreet and unobtrusive as possible.
Many secondary glazing systems force homeowners to compromise. Some rely on bulky frames that impact the appearance of traditional sash and case windows and prevent original shutters from functioning properly. Others use plastic panes fixed directly to the glass, which can make astragals appear wider and only improve the performance of the glass itself, rather than addressing draughts throughout the entire window.
The CSG System has been developed to achieve both. By providing effective draught proofing and thermal performance without compromising the character of the window, it offers a sympathetic solution for heritage homes that preserves original features, maintains working shutters and respects the architectural beauty of the property.
Customer Testimonials
Benefits of the CSG System for Sash and Case Windows
Draught Proofing
The CSG System delivers exceptional draught proofing by sealing in line with the staff bead, tackling the full perimeter of the window rather than just the glass. Unlike push-fit plastic systems that only improve glazing performance, the CSG System addresses the real source of heat loss in sash and case windows — air leakage around the entire opening. The result is a far more complete, effective and energy-efficient solution.
Energy Efficiency
The CSG System significantly improves the thermal performance of traditional sash and case windows by creating an effective insulating layer. This helps to reduce heat loss through the existing window structure, improving overall energy efficiency and helping to maintain a more stable and comfortable indoor temperature throughout the year.
We had an Energy Efficiency report carried out.
Noise Reduction
Independent testing carried out by an architect on a property located on a busy Edinburgh street showed a 9dB reduction in external noise following installation of the CSG System. This level of improvement is typically perceived as close to a 50% reduction in noise, creating a noticeably quieter and more comfortable living environment. The system is particularly effective for homes exposed to traffic, urban noise, or other constant external disturbances.
Heritage & Listed Building Friendly Design
The CSG System has been specifically developed for heritage, listed and conservation properties, where preserving original character is essential. Its slimline, discreet design ensures minimal visual impact and does not protrude beyond the staff bead, meaning it sits comfortably within the window reveal without altering the appearance of the original sash and case windows.
Importantly, the system is designed to allow traditional shutters to operate exactly as intended, with no interference or obstruction. This makes it a highly sympathetic solution that maintains both the architectural integrity and everyday functionality of historic windows.
Easy Usability & Installation
The CSG System is designed as a simple, non-intrusive retrofit solution that works seamlessly with existing sash and case windows. It can be easily opened to allow full ventilation and straightforward access for cleaning, ensuring everyday usability is never compromised. The system can also be fully removed during the summer months if desired, offering complete flexibility throughout the year. Installation is quick and minimally disruptive, making it an ideal solution for both occupied and sensitive heritage properties.
Save Energy, Money & Lower your Carbon Footprint
Start saving on your energy bills, reduce your carbon footprint, and enjoy a warmer, more efficient home—all without compromising yourwindows’ character. Our secondary glazing system delivers real performance you can feel from day one.
Save energy, save money, and cut carbon—get in touch with us today to find out more!
Get In Touch.
Interested in preserving your windows with modern comfort? Get in touch today for expert advice and a free quote.