Tried and trusted W20 steel windows


Member companies of the Steel Window Association (SWA) have reported enjoying a boom in business thanks to an upturn in activity across the housing market. A focus on the acquisition and refurbishment of rural properties has resulted in higher-than-usual demand for the replacement of the W20-style windows, they say.

The W20 closely replicates the appearance of the older universal suite of sections. Not only do the slimline sections offer slender sightlines compared to PVC-U and timber frames, their strength also provides good security and long-term robustness. The advancements in glass technology and the availability of improved weather-stripping means that the modern W20 window delivers far better energy performance than their single-glazed predecessors.

Kris Bennell, president of the SWA, said: “W20 steel frames are the ever-reliable, ever-popular traditional option. The glazing beads mean it is possible for new and refurbished W20 windows to accept 16mm-thick IG units; these in turn can feature low-E coatings on the glass, warm edge spacer bars and argon, krypton or xenon gas filling to deliver much improved U-values.

“W20 is a system that can work in a summer-house or a commercial building in London and as a stylish room divider or shower screen. It is just so versatile.”

The SWA offers UK-wide coverage. Member companies are able to carry out a full range of contracts, from the repair and restoration of heritage windows through to the installation of major fenestration packages in contemporary commercial, residential and other types of developments. For further information about the Steel Window Association, or if someone in your organisation is interested in becoming a member of the SWA, visit

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