New Sashes for Existing Window Frames
What Does “New Sashes into Existing Frames” Mean?
With this service, we retain the existing frame and replace the moving sashes with newly manufactured timber sashes. The new sashes are designed to fit precisely within the original frame while incorporating modern performance improvements.
This form of window restoration allows homeowners to keep original architectural features while benefitting from modern materials, glazing and draught-proofing systems.
Depending on the condition of the existing frame, the service may also include repairs and adjustments to ensure smooth operation.
Why Choose This Over Full Replacement?
Cost Comparison
Every property is different, but replacing the sashes while retaining the original frames is typically more affordable than installing entirely new windows.
The exact saving depends on the condition of the existing frames and the complexity of the project, but because the original box frame is retained, there is generally less manufacturing work and less installation time involved.
During a survey, we can advise whether your existing frames are suitable and provide a detailed quotation for both repair and replacement options where appropriate.
The Upgrade You Get
New sashes allow you to retain the character of your original windows while benefiting from modern performance improvements. By replacing the moving sashes and keeping the existing frames, it is often possible to incorporate high-performance double glazing, helping to reduce heat loss and improve comfort throughout the year. Modern draught-proofing systems are also fitted to reduce unwanted air leakage, eliminate rattling sashes and improve energy efficiency.
The combination of double glazing and draught proofing can help create a warmer, more comfortable home and can also reduce external noise. To ensure the windows remain in keeping with the character of the property, we can replicate original features wherever possible, including glazing bars, sash horns, profiles, traditional sightlines and ironmongery. Our replacement sashes are available in Accoya, a highly durable timber that offers exceptional stability and comes with a 50-year anti-rot guarantee.
No FENSA Certificate Required
Because the original frame remains in place, a FENSA certificate is not normally required. This can provide reassurance for homeowners who wish to upgrade their windows while retaining the original fabric of the property and avoiding the additional requirements associated with full replacement windows.
Suitable for Period Homes
New sashes into existing frames are particularly popular for period properties where retaining original features is important.
The service can be suitable for:
Georgian Homes – Preserving traditional glazing bar arrangements while improving performance.
Victorian Homes – Retaining decorative detailing while upgrading the glazing and operation of the windows.
Edwardian Homes – Maintaining original proportions and character while benefiting from modern energy efficiency.
When Repair Isn’t Possible
While retaining the original frame is often desirable, it is not always the right solution. If the existing box frame has suffered extensive rot, structural movement or significant deterioration, replacement may provide a more practical long-term solution.
During our survey, we carefully assess the condition of the existing windows and provide honest recommendations. If the frames cannot be economically repaired or reused, we may recommend a complete replacement window instead.
Our aim is always to recommend the most appropriate option for the property rather than replacing windows unnecessarily.
Our process
1
SurveY
We inspect the existing windows and determine whether the frames are suitable for retaining.
2
Manufacture
New timber sashes are manufactured in our Berkshire workshop to match the style and dimensions of the originals.
3
Installation
The new sashes are fitted into the existing frame, together with upgraded glazing, draught-proofing and ironmongery where required.
4
Finishing
Any final adjustments are made to ensure smooth operation and a high-quality finish.
Frequently Asked Questions
Can I get double glazing without replacing my whole window?
Yes. If your existing frames are in good condition, new double-glazed sashes can often be installed into the existing frame, allowing you to improve performance without full replacement.
How much cheaper is this than full replacement?
The cost varies depending on the condition of the existing windows, but retaining the original box frames is typically more affordable than replacing the entire window.
Do I need a FENSA certificate for new sashes?
No, replacing the moving sashes within an existing frame is generally considered a repair rather than a full replacement, meaning a FENSA certificate is not required.
Will the new sashes match my original windows?
Yes. We manufacture bespoke timber sashes to replicate original glazing bars, mouldings, sightlines and other period details wherever possible.
What happens if my frames are too far gone to keep?
If the frames are found to be structurally unsound or extensively deteriorated, we may recommend a full replacement solution. We will always explain the options and provide advice based on the condition of the windows.
Book a Free Survey
If you’d like to improve the performance of your existing sash windows without replacing the entire frame, our specialists can help.
Contact us today to arrange a free, no-obligation survey and find out whether new sashes into existing frames could be the right solution for your home.