If you live in a character home, period property or simply love the look of your windows as they are, secondary glazing offers a smart way to boost comfort without changing the charm. It’s especially handy when replacing the original glazing, such as in a period or listed property, isn’t an option.

Our slim aluminium frames are designed to be discreet and blend effortlessly with your existing glazing. From the outside, they’re barely noticeable, preserving your home’s appearance while improving warmth, sound reduction and peace indoors. It’s a simple upgrade that fits beautifully into traditional homes.

U values measure how much heat escapes through parts of your home, the lower the number, the better the insulation. A single-glazed window typically has a U-value of 5.6, but with secondary glazing from Hadleigh Glass, this can be reduced to around 1.8–1.9.

We also offer Low-E glass, which reflects heat back into the room, keeping things warmer for longer. It’s a simple way to cut energy bills and make your home more comfortable, all year round.

Draughts can cause chilly spots and corners around your home, especially at floor level, often leading to the heating being cranked up just to stay warm. Hadleigh Glass secondary glazing is engineered with tight tolerances to stop cold air and dust getting in, while keeping warm air exactly where it should be – in your house.

Our systems have been tested to Pressure Class 300Pa for air permeability by BSI, meeting rigorous British Standards (BS 5368: Part 1 and BS 6375: Part 1). Whether you’re heating or cooling a space, secondary glazing improves efficiency by preventing air leakage and reducing energy waste. Secondary glazing can be used in a variety of environments, its ideal for homes, offices, and air-conditioned spaces.