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Our accredited network of installers offers the highest quality uPVC and aluminium products with excellent customer service.

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energy efficient double glazing

Window Energy Ratings

A rated as standard, we offer some of the most energy efficient low-E units on the market, which deliver improved thermal insulation, increased light transmittance, maximum solar gain and low heating bills for your clients.

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High Performance Glass

Sternfenster supplies thermally efficient double and triple glazed units manufactured with the revolutionary high performance low-E glass. This glass has been optimised for Window Energy Ratings (WER) making it the most energy efficient low-E glass on the market today.

windows energy ratings UK

Superior Manufacturing

Our double and triple glazed units are manufactured to the highest standards, and are widely used in all types of applications, from standard casement windows, to bi-folding doors and conservatories. With Sternfenster, our products exceed and offer the best energy ratings for UK properties.

energy efficient windows UK

Low U-Values

Our standard reinforced double glazed units achieve a u-value of 1.2 W/m²K, with a window overall u-value of 1.4 W/m²K. For even higher energy efficient windows and noise insulation, we are also able to offer a range of triple glazed units with a u-value of 0.6 W/m²K (window overall u-value 1.0 W/m²K).

windows energy ratings
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