Heritage double glazed window are specially crafted window units that mimic the look of original single-glazed windows used in old houses. They usually have narrow profiles, original timber or metal frames, and original-style detailing. They are different from the original windows, though, in that they have two panes of glass with a spacer between the panes, which offers better insulation without altering the historic look of the building.
These windows are usually applied in conservation zones, listed buildings, and houses where maintaining the original façade is crucial. Modern glazing methods and materials guarantee that heritage double-glazed windows are up to date with current building codes while still having a period-accurate appearance.
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