On period properties, especially in conservation areas, window choice is often about proportion and sightlines as much as material — a uPVC window with the wrong glazing bar pattern can look wrong on a Victorian terrace even if it performs well thermally.
Timber-effect aluminium and slimline double glazing have both improved a lot in recent years, giving a look much closer to the original single-glazed timber frames while meeting modern building regulations for thermal performance.
Where a property is listed or in a conservation area, check with your local authority before ordering anything — window replacement is one of the areas most likely to need consent even when other work doesn’t.

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Ashton Porter
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