Double Glazed Casement Windows For Listed Buildings

Over the years we have worked with conservation officers and architects on the replacement of timber windows in listed properties and those within a conservation area and in this blog we will share our learnings in an attempt to provide some clarity.

Double glazed casement windows for listed buildings. 14th century grade ii listed kingsley house. The rules and regulations are tricky to navigate especially if the property is listed to grade i or grade ii. A technician is required to confirm that a window cannot be repaired. Double glazed window replacement for listed buildings double glazing window replacement for listed buildings is an issue for both homeowners and conservation officers.

In some circumstances the window can be replaced if it is not the original window or as part of a renovation project where some or all of the original windows have been destroyed. This means that it is often impossible to replace original glass with even slim profile alternatives as the frame. You can read more about our secondary double glazing via the link below. Historic england stipulates that a conservation officer must assess the significance of your windows and also that double glazed units are typically between 22 and 28mm thick which differs heavily from the traditional glass used in listed buildings that are usually 2 3mm thick.

When looking to improve the thermal performance of a building the windows are a building component where there are many factors to consider. Secondary double glazing is also possible for listed buildings and is often an acceptable way of preventing heat loss and satisfying conservation laws but care must be taken to ensure glazing bars match the windows bars. Can you install double glazing in a listed building. It does not rule out the use of double glazed windows in listed buildings but explains that conventional double glazed units which are between 22 and 28mm thick or slim profile double glazed units which are between 10 and 16mm thick differ from traditional glass which is normally between 2 and 3mm thick.

This is particularly the case for single glazed windows in older and historic buildings. For buildings where double glazing is not deemed appropriate the 4mm single glazed heritage casement offers the perfect solution. The windows are to be replaced with a new style of window. Securing permission to make any kind of change to listed properties can be a laborious process.

Listed buildings are protected by the planning listed buildings and conservation areas act 1990 which covers both the interior and exterior of the building. If the windows in a listed building can be repaired then it is unlikely that consent will be given. However it is by no means impossible.