Window U value regulations for replacements in 2026
Replacing windows in 2026? The legal limit is a maximum U-value, not a target. Here is what Part L asks...
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Independent guides on wooden windows, energy performance, maintenance, and European building standards. Written by our Kalnciems technical team.
Replacing windows in 2026? The legal limit is a maximum U-value, not a target. Here is what Part L asks...
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Timber frames cope with frost. The foam, tapes and sealants around them are what struggle below 5 °C. Here is...
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On a seafront elevation the timber is rarely the first thing to go. A practical guide to specifying coastal timber...
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Most cold air arrives past the frame, not through the glass. How to locate the real leak in a timber...
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What actually happens when timber windows go in: how long the opening stays open, who makes good the plaster, where...
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Standard sizes, Part L U-value limits, hardware weight classes, thresholds and Part F ventilation: a manufacturer's guide to specifying a...
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Outward-opening, top-swing, alu-clad: the scandinavian window works differently to a British casement. What that actually changes, and when it earns...
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Secondary glazing vs double glazing in a period home: which passes planning, which beats street noise, and the front-versus-rear rule...
Read ArticleOur Wooden Windows Blog is written by the people who build windows in Kalnciems - project managers, joinery engineers, and coating technicians who spend their days on the factory floor. Not marketing copywriters.
We started writing this blog because every week someone emails the same questions: Does triple glazing really save money? How long will timber frames last? What's the difference between ECO 68 and Premium 115? Short answers live on our product pages. The long, numbers-included, honest answers live here.
No AI-generated drafts republished as articles. No vague "studies show" claims. When we quote a number, we link the source - whether that's EU building directives, FSC, Passive House Institute, or our own 41 independent test reports. When we don't know the answer, we say so.
Have a question we haven't covered? Email [email protected] - we answer every technical enquiry within two business days, and sometimes that email becomes next week's article.