Gallery
Balancing aesthetics and functionality
The charm of a historical building lies in its architectural details, and windows are a significant part of the story. Replacing original glazing with modern, incongruous materials can be jarring, disrupting the building’s character and potentially diminishing its value, so a delicate balance is required. New materials should complement the existing architecture. Try to opt for traditionally-styled glazing bars or consider replicating the original profiles, if feasible. Modern high-performance glass, such as FINEO, is a new glass technology and a perfect solution for heritage applications. It insulates as effectively as triple glazing but is lighter and thinner, meaning it can be installed into existing window frames without altering the appearance.
Expert tip:
Look at all the options. We always try to work as sustainably as possible and love the fact that it is now possible to have glazing that is 100% recyclable. Also, look for glazing that blocks UV rays, as this will reduce discolouration of interior furniture.
Understanding the regulatory requirements
Many historical buildings have a protected status, with strict guidelines governing renovations. These regulations often dictate the type of materials allowed, the extent of permissible alterations and even the glazing techniques employed.
It is important to evaluate the significance of a historical building as a heritage asset in its setting at the outset, as this will determine what could be accepted by Historic England and in response to National Policy. For example, if the building is listed, then you will need to consider its ‘historic fabric’, and altering it in any way will require proper assessment and justification.
Expert tips:
• Take advice from an architect with a track record of working on historic buildings. They have the expertise to navigate the regulations and ensure your project complies while meeting your practical needs and budget.
• Research local planning precedents to understand what has been accepted before.
• When dealing with historic buildings, it is often subjective without solid justification.
• It is important to assess the existing windows to support an application to repair, restore or replace. Get the windows properly surveyed by an architect or specialist window company, checking the size of glazing bars or sash cord to understand if modern glass can be added, as it is often thicker and heavier. In more historic circumstances, an intrusive survey will probably be required by a specialist. This could involve taking a sample from part of the window frame to fully understand its condition, i.e. behind the paint and outer layer.
Selecting appropriate glazing materials
Modern technology offers a plethora of glazing options, but some prioritise functionality over appearance.
Here’s how to choose the right materials:
• Glass: Consider using low-emissivity (low-e) glass, which allows light in while reflecting heat, improving energy efficiency. For a more traditional look, opt for slightly rippled or textured glass, mimicking the imperfections of mouth-blown glass.
• Glazing bars: Choose glazing bars made from materials that complement the original window frames. Wood is a popular choice, but maintenance-free alternatives like composite materials also exist, though these will often need to be approved by a conservation officer.
• Sealing and weatherproofing: Employ traditional glazing techniques like putty or glazing compounds whenever possible. These methods contribute to the historical character of the window. However, some modern alternatives may be required for optimal performance.
• Secondary glazing: In some cases, retrofitting existing windows with secondary glazing might be a viable solution to improve energy efficiency without altering the original appearance.
Expert tip:
Original windows tend to be very old but so too is the building they sit within. There could be damp or underlying rot issues within the fabric of the building, so whilst restoration or replacement of windows may seem like the only solution needed, it is always advisable to have the parent building inspected as well. Otherwise, your new windows could become damaged again in five to 10 years and need investment once more.
Impact on property value and energy efficiency
Investing in quality glazing that respects the history of your home can have a significant impact on the property’s value. Well-maintained historical buildings often command higher market prices, and maintaining the original appearance through responsible glazing choices can further elevate the property’s appeal to potential buyers.
In addition, modern glazing materials can significantly enhance a building’s energy efficiency. This translates to lower energy bills and a more eco-friendly footprint, appealing to environmentally-conscious buyers. Noise pollution from the street can also be significantly reduced.
Expert tips:
• Seek professional help: Consult with an architect and experienced glaziers specialising in historical buildings. Their knowledge of specific techniques and materials, plus what is permissible by law, can ensure a successful restoration.
• Maintain a paper trail: Document the historical character of the windows and the glazing decisions made. This will benefit future owners and ensure the property’s integrity is maintained.
• Consider long-term sustainability: Choose durable materials and invest in proper maintenance to prolong the lifespan of your windows. This reduces the need for future replacements and minimises environmental impact.
Glazing for historical buildings requires careful consideration. By balancing a respect for the past while embracing modern advancements, you can ensure your windows enhance your property’s value and energy efficiency. A well-executed glazing project can be a testament to responsible ownership, preserving history for generations to come.
