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Window Restoration Specialists

Secondary Glazing

Traditional Leaded Lights


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Protecting and enhancing property with traditional windows, whether they be leaded lights, sash windows or even crittall windows can be a daunting task. However this is a task we undertake on a daily basis at Tec Glass. This site is aimed at learning and knowledge transfer, a place to share our experiences and answer many common questions that get raised.

Why are they called leadlights?

Before the 16th Century windows or apertures had unglazed openings, typically sliding or folding shutters were used instead - made out of wood, horn, oiled cloth or similar.

The earliest glazed windows first appeared in prominent buildings or in wealthy families. They used very small pieces of glass (quarrels or quarries) held together with soft lead strips (cames). In order to make a large window therefore the space was subdivided by stone or timber mullions so the small leaded panels - or “lights” - could be installed either fixed or opening.

Hence the name leadlights was created, often abbreviated to “lights”. Stained glass is often nowadays grouped with leaded lights in terms of speciality, primarily due to similar methods of construction. However stained glass requires a more artistic skill set and process.

Leaded windows and leaded door panel restored

Window Restoration or Replacement?

This is the main dilemma people have when they have problems with distorted or broken leaded lights, leading to water damage and/ or extreme draughts.

The problem with leaded windows is that unless the damage is slight or localised it is not something that can be easily repaired by an average DIY enthusiast. However a specialist glazier can temporary glaze and re-lead the whole panel, as new.

If your property Grade I or II (and II*) listed then repairs on-site or in a workshop are the only viable alternative normally. In this scenario draughts are solved using Secondary Glazing - which has added benefits such as extra security and significant noise reduction.

Where replacement is an option there are a few modern alternatives such as aluminium windows, double glazed timber or even uPVC windows. However like all things there are caveats. The two main considerations are cost and visual appeal. But the biggest issue is appearance. Double glazing with stick on lead just cannot replicate the unique shimmering effect and vitality of a traditional leaded light.

Our advice is fairly simple and in two parts. First would be to be clear about what you would like to achieve from change, in an ideal world. Second is to do a lot of research, talk to friends or people who have similar property and view examples or samples.

Traditional brass window stay restored

We launched this website to try and create a useful resource for anyone looking to repair, restore or replace their leaded light windows. We hope visitors can contribute and help grow the information available so please don’t hesitate to get in contact.

Stained glass panels restored

What type of glass should be used?

Modern glass production is focussed on supply of a perfect, blemish free product. Which has meant a decline in the supply of “antique glass”, produced by the traditional mouth-blown method.

The art of making antique “muff” or “cylinder glass” is still practised by one company in the UK but the majority is sourced from a small number of firms in Europe.