The Great Window Fallacy — Where tradition is too often underestimated. Conventional wisdom insists that timber sash windows are charming, yet inefficient. Visually elegant, but technically obsolete. A sentimental choice suited only to listed buildings and Georgian façades. This is not just outdated thinking — it is objectively incorrect. Modern timber sash windows are no … Continued
The £3,000 Draught You Didn’t Know You Had “Your windows aren’t broken. They’re simply obsolete—thermally, architecturally, and economically.” The greatest source of energy loss in most homes isn’t the roof or the boiler. It’s the windows. In London, the average period property can lose up to 38% of its internal heat through outdated glazing. That … Continued
Your Glazing May Be Compliant — But That Doesn’t Make It Passive If you only measure U-value, you’re building insulation — not architecture. In today’s glazing market, the conversation around performance too often begins — and ends — with U-value. Suppliers will point to it as proof of quality, citing compliance with Part L of … Continued
The Invisible Leak: Why Your Home is Bleeding Heat The signs are familiar. A persistent chill in the hallway, long after the heating has stopped. A room that never quite reaches temperature, even with modern double glazing. The thermostat rises. The warmth does not stay. Conventional wisdom places the blame on the glazing. Triple panes, … Continued
The Myth of the Pane: Why U‑Values Aren’t What You Think For decades, homeowners have been led to believe that window performance begins and ends with glass. Add another pane, they’re told — double it, or triple it — and efficiency will follow. It’s a simple message, and an incomplete one. In reality, energy performance … Continued
Winter Is Approaching — Are Your Windows Up to Standard? As the days shorten and temperatures drop, the ambient warmth within your home begins to slip away — often more rapidly than expected. You turn up the thermostat. You reach for another layer. Yet the cold persists, subtly but insistently. In most cases, it isn’t … Continued
The Silent Culprit Behind Rising Energy Bills London’s most distinguished homes — with their soaring ceilings, intricate cornices, and elegant sash windows — were designed for grandeur, not thermal performance. Yet behind their architectural beauty lies a persistent and largely invisible inefficiency: the steady loss of heat through outdated glazing. Each winter, the symptoms become … Continued
The Truth Behind the Badge The Passive House standard has become something of a byword for building excellence—particularly when it comes to windows. Certified systems are marketed as the pinnacle of performance: energy-efficient, expertly engineered, and future-ready. But a fundamental question remains—does certification automatically guarantee real-world benefit? At Sash Windows London, we recognise the scientific … Continued
