Yes. Original sash windows can often be made significantly more energy efficient through restoration, draught proofing and secondary glazing, without replacing the original timber frames.
Why Are Traditional Sash Windows Inefficient?
Older sash windows are often associated with:
- draughts
- rattling
- cold spots
- heat loss
This usually happens because windows have deteriorated over time rather than because the original design itself is flawed.
Gaps around the sashes can allow uncontrolled airflow, reducing comfort during colder months.
How Can Sash Windows Be Improved?
The most effective upgrades usually involve:
- sash window draught proofing
- secondary glazing
- window restoration
- careful repairs to timber and putty
These measures can improve thermal performance while preserving original character.
What Is Sash Window Draught Proofing?
Draught proofing reduces unwanted gaps around the window frames while allowing the windows to continue operating normally, more smoothly, and allows the home to breathe naturally.
Professional draught proofing can help:
- reduce cold air infiltration
- improve comfort
- lower heat loss
- reduce rattling
Does Secondary Glazing Help?
Yes. Secondary glazing adds an additional insulating layer behind the original window.
This can:
• improve thermal efficiency
• reduce condensation
• improve acoustic insulation
• maintain the original appearance of the property preserve architectural heritage
It is especially popular in listed, period and conservation properties.
Is It Better to Restore or Replace Sash Windows?
In many period homes, restoration is often preferable to replacement because it:
• preserves historic character
• retains original timber
• avoids unnecessary alterations
• supports conservation requirements
Many original sash windows were made from high-quality timber that can last for generations when restored properly. Mitchell & Dickinson have craftsmen with a wealth of experience who can restore your windows to their former glory
Can Energy Efficiency Be Improved Without Losing Character?
Yes. Specialist heritage solutions, such as Mitchell & Dickinson’s CosyGlazing, are designed specifically to improve comfort discreetly.
Modern upgrades can often remain:
• minimally visible
• reversible
• sympathetic to the building’s character
This is particularly important in Georgian and Victorian properties.
How Much Difference Can Improvements Make?
Many homeowners notice:
- fewer draughts
- warmer rooms
- reduced condensation
- lower heating demand
The combination of restoration, draught proofing and secondary glazing often delivers the strongest results and are carbon saving.
Specialist Solutions for Period Homes
Mitchell & Dickinson specialise in improving comfort and efficiency in period and listed homes.
Our solutions are designed to:
- preserve original windows
- improve year-round comfort
- reduce heat loss
- maintain heritage character
- improve energy efficiency
FAQs
Can old sash windows be energy efficient?
Yes, many original sash windows can be upgraded successfully without replacement.
Does secondary glazing help sash windows?
Yes, it improves insulation and comfort while preserving original features.
Is sash window restoration worth it?
For many period homes, restoration can improve both comfort and long-term value.
