Sash Window Double Glazing Upgrades

Modern Thermal Performance for Heritage Homes

The biggest challenge with traditional windows is heat loss. For years, homeowners believed they had to choose between a cold house with beautiful windows or a warm house with ugly uPVC. Our double-glazing upgrade service removes that compromise. We specialise in retrofitting high-performance, slimline double glazing into existing or new timber sash frames.

We use “Slimline” glass units, which are specifically designed for period properties. These units feature a very narrow cavity filled with insulating gas, allowing the overall thickness of the glass to remain low enough to fit within traditional glazing bars. From the street, the windows maintain their delicate, original appearance; from the inside, the difference in warmth and noise reduction is immediate.

Beyond just the glass, our upgrade service includes a full overhaul of the window’s movement. Because double-glazed units are heavier than single panes, we recalibrate the internal weight system to ensure the window remains perfectly balanced and safe to operate. This upgrade is an excellent investment for those looking to lower their energy bills and reduce their carbon footprint while protecting the character of a Victorian or Edwardian building. It provides the thermal efficiency of a new build with the soul of a heritage restoration.