Secondary glazing sash windows

New secondary glazing for sash windows offers a solution that removes the need for extra framing on the interior of the primary window.

Upgrading original sashes with vacuum double glazing provides superior thermal insulation and noise reduction while maintaining the aesthetic integrity of the windows by eliminating the need for bulky secondary glazing.

      EXCELLENT  
   Based on 48 reviews 
    
 
 
 
   
 
 
      Posted on Google  
   
   Danielle K 
 83 days ago
 
 
 Trustindex verifies that the original source of the review is Google. We're so pleased with how the windows turned out, the refurbished frames look so good. Anecdotally, they seemed to have improved the soundproofing,  although we live practically on top of a main road,  so does not completely shut out the noise, the casement windows more than the bay windows. Cannot comment on the thermal quality as they were done in the middle of the heatwave, but we are fairly confident there will be a big improvement come winter. Cannot fault the workmen, they were reliable and extremely hard working, even when it was 30C +

Would definitely use them again if we ever needed windows to be refurbished in future.
  
 
     Posted on Google  
   
   Heidi Darlow 
 86 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Very happy with the new windows they look fantastic.
Keeping the original windows was so important to us and you have made that possible.
We only had the upstairs completed and can't believe the difference in the sound and temperature from downstairs.
Will be booking the downstairs in ASAP.
The team are also fantastic and worked incredibly hard they treated our home with respect and keep evething as clean as they can.
I would definitely recommend.
Hopefully we will get the same team next   time!
The neighbours are also asking who done the work and have commented on how hard you worked !
Very happy customers.
  
 
     Posted on Trustindex  
   
   B Turner 
 103 days ago
 
 
 Trustindex verifies that the original source of the review is Trustindex. Highly recommended for heritage properties
A genuinely reassuring experience from start to finish. If you've got a heritage property and you're agonising over who to trust, look no further. Highly recommended.
  
 
     Posted on Yell  
   
   FreyaHall 
 111 days ago
 
 
 Trustindex verifies that the original source of the review is Yell. Very satisfied with the job done. The draughts are gone, the windows open easily and I'm very happy with how they look.
  
 
     Posted on Google  
   
   Ryan Parker 
 117 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Scott James did our restoration work years ago, so when it came time to sort the insulation, there was no question who we'd call. Glad to say they're still the same lot. Still doing things properly.
The new VIG glazing has made the house genuinely warmer, and a fair bit quieter too. Lovely to see familiar faces, lovely to see they still take pride in the work. Wouldn't go anywhere else
  
 
     Posted on Trustindex  
   
   Megan 
 130 days ago
 
 
 Trustindex verifies that the original source of the review is Trustindex. Exceptional sash window restoration experience
We had a great experience having our sash windows double glazed and draught proofed. We were very impressed by the quality of the work and the team’s craftsmanship from the start. From the initial consultation with Alex right through to the restoration of the windows, the experience was seamless. They were clearly experts in their field.
  
 
     Posted on Google  
   
   Scarlett Mackins 
 143 days ago
 
 
 Trustindex verifies that the original source of the review is Google. The end result genuinely surprised us. The original frames have been brought back to life sanded, restored, repainted and the new glazing has made a noticeable difference to both the temperature and the noise from the road. For roughly what secondary glazing would've cost, we've got something that actually looks like part of the house rather than bolted onto it.
  
 
     Posted on Yell  
   
   HarryW-598 
 151 days ago
 
 
 Trustindex verifies that the original source of the review is Yell. Really happy with my newly refurbished sash windows.
  
 
     Posted on Trustindex  
   
   Lucy Clarke 
 156 days ago
 
 
 Trustindex verifies that the original source of the review is Trustindex. Exceptional sash window service
We had a really great experience getting our sash windows double-glazed and draught-proofed
  
 
     Posted on Yell  
   
   ThomasHammond-908 
 167 days ago
 
 
 Trustindex verifies that the original source of the review is Yell. Excellent job, I would highly recommend

Why is secondary glazing sash windows considered an outdated solution?

Many homeowners ask us to remove their secondary glazing and reglaze the original sashes with vacuum glazing, and there is a good reason for this.

Aesthetics – Some people feel secondary glazing looks unattractive from the outside or inside. Extra glazing bars and panes of glass can alter the look of your home.

Reduced natural light – Secondary glazing creates another layer between you and the outside, which can marginally reduce the amount of natural light coming into a room. This may make some spaces feel slightly darker.

Extra cleaning – You now have an extra layer of glass that needs cleaning and maintenance. This adds a minor inconvenience factor.

Cramped Window Operation and Reduced Space: Secondary glazing can make operating the original windows difficult and awkward. The extra framework also takes up valuable space.

Comparing secondary glazing to reglazing

Vacuum double glazing provides the same level of thermal insulation as triple glazing.

In contrast to secondary glazing, the windows are fully refurbished during the reglazing process, eliminating the need for additional budgeting for window restoration.

Secondary glazing

Double glazing orignal frames with VIG glass

Appearance

Add second framing from the inereor side

Look sleek as orginal window.

Listed builsing approval

Does not need a permission

90% approval rate

Thermal insulation

1.7 W/m²K – 2.7W/(m²K)

0.48 – 0.7W/(m²K) same as triple glazing

Noise reduction

30dB – 45dB Depending on air gap between the existing primary window and the new secondary glazed unit.

35 dB – 39 dB

Cost (Materials and installetion)

£500 – £2200 By installing secondary glazing, you will need to allocate a separate budget for sash window maintenance, whereas reglazing encompasses the cost of sash window refurbishment.

£1500 per avarage window Price includes window frame restoration, draught-proofing, VIG glass cost of production and installation, painting.

Cost of refurbishing existing window frames

no included in secondary glazing price

Included in the price

Light transmission

90%

78% – 79%

Security

Additional glazing adds additional security.

Toughened glass

Transforming original windows with VIG glazing: Key benefits

Benefits of reglazing your original wooden windows with thin-profile vacuum-insulated glazing units.

Retrofitting existing wooden window frames with double glazing preserves their original aesthetic appeal and character while enhancing the windows’ energy efficiency and performance.
The use of slim, vacuum-sealed glass units results in superior thermal insulation and soundproofing, rivaling the efficiency of standard triple glazing.
Over 90% of our applications are approved.

Our process sees over 90% approval rates for applications.
We specialize in crafting custom vacuum-insulated glass units tailored to fit the diverse shapes and sizes of historic wooden window frames.
Vacuum-insulated glass (VIG) in our double-glazing units boasts a remarkably longer lifespan than traditional double-glazed options.

Learn more

Guarantees

An extensive guarantee covers all elements of our reglazing service, providing peace of mind.

Guarantee on VIG glazing

A blue and white 20 years badge on a white background with secondary glazing.

Guarantee on repairs made with Accoya

A large red brick house in the middle of a garden, retrofitted with double-glazing.

See Project

Cost considerations

Reglazing traditional sash windows using toughened vacuum insulated glass (VIG) double glazing typically costs around £1700 per window, which includes not only the installation of the VIG but also draught-proofing and comprehensive restoration of the frame and sashes. This price is often on par with or even more affordable than premium secondary glazing solutions for listed buildings.

Unlike secondary glazing, which simply adds an extra glass pane behind the existing window, this reglazing process incorporates the essential restoration of the window frame itself. This means that you do not have to incur additional expenses for window frame restoration.

What’s included

Double glazing retrofitting

Supply and installation of Vacuum Double-Glazing

Double glazing retrofitting

Window frame restoration

Restoration and rot repair for window frames and sashes

Window frame restoration

Draught-proofing

Installation of draught-proofing seals

Draught-proofing

Painting

Painting of wooden window frames

Painting

Visual proofs of thermal efficiency

Detailed thermal photographs displaying the reduction in heat loss.

VIG glazing is more efficient than standard triple glazing.

thermal insulation results of Secondary glazing sash windows

Secondary glazing sash windows installation process

Book a free quote —>

We fully survey your windows and provide recommendations for reglazing and restoration.
We help you with building consent applications. Over 90% of our applications are approved. This is only applicable to Grade 2 listed properties. If your property is not listed, we will skip this step.
When you receive approval, we will place the order for the production of a custom vacuum double-glazed unit.
Our highly skilled craftspeople restore and reglaze your existing sash windows.