Choosing the best glass for my heritage windows

Choosing the right window glass for your heritage property requires careful consideration of several factors such as planning requirements, the style of the building, the purpose of the room, energy efficiency, and the desired aesthetic.

It’s important to consider more than just the style and colour of the window frame when replacing windows. Take into account any issues present in your house, as there are various types of glass available that can help address these concerns.

By selecting the appropriate specialist glass for your rooms, you can greatly enhance the comfort and enjoyment of your living spaces.

Sash windows in white.


The main problems solved by different types of glass:

Secondary Glazing

The primary reasons why homeowners opt for secondary glazed windows are their ability to provide peace and quiet, warmth, and security. The following four features are the foundation of our distinct secondary glazing system, and they are the driving force behind why so many homeowners are embracing secondary glazing.

Noise Reduction

From a sound insulation perspective, secondary glazing offers the most effective levels of noise reduction on today’s market, significantly outperforming all other glass solutions. Our custom-made secondary glazing utilizes cutting-edge machinery to create a tightly sealed frame that can decrease noise levels by an impressive 80%.

Thermal Insulation

If draughty windows are of bigger concern for your property, secondary glazing can provide an additional layer of protection to keep your home from losing heat. The narrow gap between your current window and the secondary unit acts as an insulator, producing a separate layer of air between the two that can decrease heat loss by as much as 65%.

Enhanced Security

If security is your priority, secondary glazing offers a unique, additional deterrent to any would-be intruders. In contrast to conventional windows, opening secondary glazing from the outside is extremely challenging, providing an extra layer of protection against forced entry.

Seamless Aesthetics

Our secondary glazing systems boast a sleek and contemporary design that enables you to relish all the benefits of sound insulation, heat retention, and security without having to sacrifice style.

Secondary glazing window glass


Slim Double Glazing

With rising heating bills, many homeowners are seeking solutions that optimize the energy efficiency of their timber windows, while still preserving their genuine appearance and appeal.

Replacing your original single glazed sashes with purpose made double glazed sashes, can provide an energy efficient solution without undergoing significant property disruption, all while preserving the authentic look and feel of your period windows.

Traditional Carpentry

By using slim glazing units in our manufacturing process, we can uphold traditional carpentry techniques and incorporate solid glazing bars into your new sashes, rather than simply attaching them to the glass. This ensures that the window maintains its authentic period aesthetic. Additionally, the slim glazing unit reduces the sightline of the spacer bar between the two panes of glass, allowing us to create narrower glazing bars and closely replicate the existing windows.

Slim double glass glazing - heritage property


Specialised renovation service

When choosing our Double-Glazed sashes, our specialised renovation service also includes a full overhaul of your sash box, or window frame, including:

  • Sanding down & replacing any rotten timbers in the sash box, taking your windows back to sound & healthy wood.
  • Replacing your pulleys & chords • Weighing your new sashes and installing the correct weights within your sash box, so your windows operate smoothly.
  • Installing new hardware
  • In addition to the above, we also install our unique draught proofing system the Ventrolla Perimeter Sealing System in and around the moving sashes. This system closes the gaps that let heat escape and draughts in, making for a warmer home.


Regardless of the size of the project, which can vary from small domestic homes to large commercial buildings, Ventrolla’s principles remain the same: to restore the original beauty of your sash windows while enhancing efficiency. For more information, contact our team.


FAQs for Choosing the best glass for heritage windows.


  1. What factors should be considered when choosing glass for heritage windows?

    When choosing glass for heritage windows, several factors should be considered, such as the age and style of the windows, the architectural significance of the building, energy efficiency, and the desired aesthetic appearance.

  2. What type of glass is best for heritage windows?

    The best type of glass for heritage windows depends on several factors, including the building’s location, the desired energy efficiency, and the original style of the windows.

  3. How important is energy efficiency in choosing glass for heritage windows?

    Energy efficiency is an essential consideration when choosing glass for heritage windows, as it can significantly impact the building’s overall energy consumption and costs. In addition, using energy-efficient glass can also help to preserve the original windows by reducing moisture infiltration

  4. Are there any regulations or guidelines to follow when replacing glass in heritage windows?

    Yes, there may be regulations or guidelines to follow when replacing glass in heritage windows, depending on the location and type of building. It is essential to consult with local authorities or preservation organizations to ensure that the replacement glass meets any requirements and maintains the building’s historical integrity.

  5. How much does it cost to replace or restore glass in heritage windows?

    The cost of replacing or restoring glass in heritage windows can vary widely depending on several factors, including the size and complexity of the windows, the type of glass used, and the extent of the restoration work required. It is best to consult with a professional to get an accurate estimate for your specific needs.

  6. Should I consult with a professional when choosing glass for heritage windows?

    Yes, it is highly recommended to consult with a professional who has experience in preserving and restoring heritage windows. They can offer expert advice on selecting the best glass options for your specific needs and ensure that the installation process is done correctly. Our expert team at Ventrolla are happy to help with any further questions, you may have about your wooden window project contact our team today.