Windows & Glazing

Expert guides on double glazing, triple glazing, window types, costs, and energy ratings for UK homeowners. Find out which windows save the most energy and money.

86 articles

Latest Windows & Glazing Articles

Windows & Glazing

Transom Windows Traditional Character with Modern Glazing UK

Understanding Transom Windows and Their Place in British Architecture Transom windows are one of the most characterful and historically significant glazing features found in British homes, yet many homeowners are uncertain about exactly what they are, how they work, and whether they can be upgraded to meet modern standards. Understanding what you have — or […]

24 min · 12 Mar 2026
Windows & Glazing

Window Sash Weight Replacement Modern Counterbalance Systems

Understanding Sash Window Weights and How They Work Traditional sash windows are one of the defining architectural features of Britain’s Victorian, Edwardian, and Georgian housing stock, and the counterbalance system hidden inside their frames is an elegant piece of mechanical engineering that has been working quietly in UK homes for well over two centuries. Understanding […]

20 min · 12 Mar 2026
Windows & Glazing

Is Secondary Glazing Worth It for a Victorian Terraced House

Victorian terraced houses account for a significant proportion of the UK’s oldest and least energy-efficient housing stock. Built before cavity walls, loft insulation, or double glazing existed, these characterful homes lose heat rapidly through their original single-glazed sash windows — and for many owners, replacing those windows entirely is either legally complicated or simply undesirable. […]

17 min · 12 Mar 2026

Windows & Glazing Glossary

U-value
A measure of heat transfer through a material. Lower U-values mean better insulation. Modern double glazing achieves around 1.2 W/m2K.
FENSA
Fenestration Self-Assessment Scheme. A government-authorised body that certifies window installers meet building regulations.
Low-E glass
Low-emissivity glass with a microscopic metallic coating that reflects heat back into the room while letting light through.
Argon fill
Argon gas injected between panes of double or triple glazing. Being denser than air, it reduces heat transfer by up to 30%.
Warm edge spacer
The bar that separates panes of glass. Warm edge spacers reduce heat loss at the edge of the sealed unit compared to aluminium spacers.
WER
Window Energy Rating. An A++ to E scale showing overall window energy performance, considering U-value, solar gain, and air leakage.
Trickle vent
A small opening in a window frame that allows controlled ventilation. Required by building regulations in most new window installations.
Mullion
A vertical bar dividing a window into sections. Can be structural or decorative (applied to the glass surface).

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