If you're starting from scratch, here's the three-way picture across the factors that decide a window: comfort, upkeep, strength, looks, and how long it'll last.
uPVC and wood both insulate well because neither conducts heat much. Aluminium conducts heat unless it has a thermal break. In a hot climate this favours uPVC and wood for comfort.
uPVC needs the least — an occasional wipe. Wood needs the most — sealing and painting on a cycle. Aluminium sits in between, needing little but able to chalk over time on cheaper finishes.
Aluminium is strongest and allows the slimmest frames on large glass. Wood has unmatched natural character. uPVC balances solid performance with woodgrain finish options that approximate the timber look without the upkeep.
For low-maintenance comfort, uPVC. For natural character and you don't mind upkeep, wood. For slim frames on very large openings, aluminium. Most homes are best served by uPVC across the board.
For most homes, uPVC — it balances heat comfort, near-zero maintenance, good sealing against dust and noise, and woodgrain looks if wanted.
uPVC, clearly. Wood is the most demanding; aluminium is low but can chalk over time.
Subjective — wood has natural warmth, aluminium gives a sleek modern line, and uPVC offers both white and woodgrain finishes to suit either taste.
Related guides covering this topic from other angles — different products, applications, or contexts.
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