Premium Secondary Glazing For Traditional Sash & Case Windows.
Improving thermal efficiency, reducing noise and eliminating draughts in heritage homes whilst protecting traditional architecture.
The CSG System.
Discreet Secondary Glazing for Heritage Sash and Case.
The CSG system is a patented, innovative secondary glazing solution designed to maximise performance while preserving conservation and heritage of traditional sash and case windows.
It eliminates draughts, significantly improves thermal efficiency, and reduces external noise by up to 50% — all while remaining nearly invisible. Our system works seamlessly with existing shutters and does not alter or damage heritage homes.
Scotland is home to some of the UK’s most beautiful traditional architecture. At CSG, we help homeowners improve the thermal efficiency of their heritage properties while protecting the architectural features that make them special.
You may also be eligible for a grant or loan — see https://www.homeenergyscotland.org/ to learn more.
We can cover most of Scotland, as well as many areas of England.
Protect Beautiful Traditional Sash & Case Architecture with the CSG System.
Benefits
Visit our Benefits and Specifications pages to discover the 12 key benefits our system adds to traditional homes, without compromising visual clarity.
Specifications.
You’ll also find detailed technical drawings, a BRE report on thermal performance, noise reduction test results, and supporting documentation.
Visit Our Showroom.
You’ll find us in Charlestown, Fife—just a quick trip from Edinburgh! Our showroom has the CSG system installed on a sash window. If you’d like to pop by for a look, just give us a call or send an email, and we’ll set up a time that works for you.
Why CSG?
There are a few different secondary glazing solutions on the market. This is how the CSG system compares to some alternatives.
The CSG System
CSG is the premium secondary glazing solution for listed and heritage homes. It delivers high performance while remaining virtually invisible, and draught-proofs the entire window — something plastic push-fit panels cannot achieve. Installed onto the staff bead, CSG also allows traditional shutters to operate normally.
- Discreet
- Fully Draught Proofs
- Listed Building Consent
- Glass
- Allows Shutters to work
- 50% Noise Reduction
Push Fit Plastic Panels
Plastic push fit panels offer a simple form of secondary glazing. However, the panels sit within each individual pane so does not draught proof the entire window, draughts and air leakage around the frame is typically one of the biggest issues in heritage homes. Their appearance can also be more noticeable than CSG, as they can make the astragals appear wider.
- Discreet
- Fully Draught Proofs
- Listed Building Consent
- Glass
- Allows Shutters to work
- 50% Noise Reduction
Traditional Framed Secondary Glazing
Traditional secondary glazing can deliver good thermal performance, but the larger internal frame can be visually intrusive in period properties. For listed and heritage homes, it can obscure the original window, interfere with traditional shutters and detract from the character of the room – meaning planning permission for heritage homes is unlikely.
- Discreet
- Fully Draught Proofs
- Listed Building Consent
- Glass
- Allows Shutters to work
- 50% Noise Reduction
Our Solution
The CSG System.
CSG is the premium secondary glazing solution for listed and heritage homes. It delivers high performance while remaining virtually invisible, and draught-proofs the entire window — something plastic push-fit panels cannot achieve. Installed onto the staff bead, CSG also allows traditional shutters to operate normally.
- Discreet
- Fully Draught Proofs
- Listed Building Consent
- Glass
- Allows Shutters to work
- 50% Noise Reduction
Projects & Gallery
Check out Gallery to see some of the beautiful homes and buildings that have installed the CSG System.
Frequently Asked Questions
Will My Shutters Still Work?
Yes! As we work with traditional listed buildings that so many of have shutters. Our system is designed to ensure full function of shutters just as normal.
Will it lower the window's U-Value?
We had BRE carry out a thermal efficiency report that concluded our system makes your window almost 50% more thermally efficient.
Do I need planning permission?
Every council has its own regulation and rules. In every council area we have applied listed building consent for has been approved with no problem. If in doubt please apply for Listed Building Consent and check with your local council. If you need help with this just let us know and we can assist.
When can I visit the showroom?
To visit the showroom, please send us an email or give us a phone and we can find a time for you to see the system installed on a real sash and case window in Charlestown, Fife.
Is it made with glass?
There are a few secondary glazing systems on the market made with various materials such as plastic. Our standard range is made with 4mm of toughened safety glass and we offer acoustic glass that is 6.8mm for customers looking to prioritise noise reduction.
Can I put the CSG system on to my curved sash windows?
Yes! We can accommodate curved sash windows.
How Much Do They Cost?
For a rough quotation please email us with the sizes of your sash windows. Costs will typically range from £600 – £1500 per window depending on size, location and various additional services we offer.
Does the CSG System Open For Ventilation?
Yes! The system can open for ventilation and full access to your original window without having to remove it.
Can the System Be Temporarily Removed?
Yes! The system can be removed and put back on very easily. Some of our customers choose to remove the system in the summer months and then put it back on once the weather starts to get colder.
Have Any Questions Not Included? Please Get In Touch.
Customer Testimonials
Get In Touch.
Interested in preserving your windows with modern comfort? Get in touch today for expert advice and a free quote.
- Sales@csg-team.com
- 07471263800
- Camsie House, Charlestown, Fife, Scotland, KY11 3EE