For casement windows specifically, how do aluminium and uPVC compare? Here's an honest look.
Aluminium window frames are strong and slim, which lets them carry large panes with thin sightlines. But aluminium conducts heat readily, so an aluminium frame transmits more heat than uPVC unless it has a thermal break.
uPVC frames are multi-chambered — the hollow chambers trap air, which slows heat transfer. That makes uPVC naturally insulating without needing a thermal break.
We build in uPVC, so take this with that in mind: aluminium is genuinely good where you want very slim sightlines on a big span. For most homes here, uPVC's insulation and zero maintenance win — but we'd rather be straight than pretend aluminium has no place.
uPVC casements insulate naturally and seal tightly with multi-point locking; aluminium casements offer slimmer sightlines but need a thermal break to match on insulation.
Both seal well with quality hardware — the sealing comes from multi-point locking against gaskets, which either can have.
We build in uPVC, and for most homes here its insulation and zero maintenance win. Aluminium suits where very slim sightlines matter.
Related guides covering this topic from other angles — different products, applications, or contexts.
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