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Window Restoration Specialists

Secondary Glazing

Traditional Leaded Lights

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Secondary Glazing solutions

Tec Glass are a specialist glazier who are very experienced with installing secondary glazing into large, listed or period properties.

We are frequently asked to supply secondary glazing due to our expertise in traditional window restoration.

Many clients with leaded windows in crittall, steel or even timber frames are looking for a double-glazed solution without a “rip and replace”. Secondary glazing is the most elegant solution to this issue, whilst adding other major benefits.

Secondary Glazing - Horizontal Slider

Secondary Glazing introduction

How do I choose the right solution?

Who will benefit and how?

Around 1/5 of heat loss from a house is through the windows. Sash windows are a prime example, frequently being prone to draughts. For many households, replacing old single glazing with double glazed units is both disruptive and expensive.

A cost-effective way of reducing the heat loss whilst retaining the inherent character of traditional windows involves Secondary Glazing. There are DIY solutions available however these tend to be fairly basic and often semi-permanent.

Our secondary glazing solution incorporates an aluminium frame (glazed) and a high quality timber sub-frame. It can be powder coated to any RAL colour type and normally fits into the window reveal - ideally with a gap of 100mm to the external window. It is a complete second window, which can either slide or tilt open, or fixed but removable.

Conceptually secondary glazing is a very straightforward proposition however there are quite a few different solutions and suppliers which can make decision-making very difficult.

We would definitely recommend talking with a specialist supplier such as Tec Glass, who can position the pros and cons tailored to your own situation. This is in addition to the background information on this site, real samples we can show you and obviously customer project references.

Like our customers we are very particular about the quality and finish of the solutions provided. After 12 months of trial we selected one of the market leading systems that  we are happy to install and support. To date all feedback has been excellent and is now an essential complimentary addition to our restoration work.

Secondary Glazing is a perfect solution for listed or period property where modern double glazed solutions are either “out of keeping”, restricted by planning or simply not wanted. It is also worth strong consideration where price of replacement is prohibitive.

Replacing the entire window with a modern alternative such as aluminium or uPVC is often considered. However it can destroy the character of the property, is costly and normally very disruptive (on installation). All issues that are avoided with secondary.

The main benefits of a professionally installed secondary glazing system focus on thermal and noise insulation. These are explored fully on our benefits page but there are other great reasons to consider such as added security of a second window with optional locking.

All pictures featured on this website involve Tec Glass projects and require permission to use or copy

15th Century listed farm house with secondary glazing