You can buy standard-size uPVC off the shelf or have it custom-made to your openings by a local maker. For most real homes, the difference shows up in the fit.
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For fit, custom-made — it matches your opening exactly, while standard sizes rarely fit older openings without gaps or compromise.
For a one-off opening that happens to match a standard size. Most real homes are non-standard.
A little, for measurement and making — but it buys a window built for your actual wall rather than an approximation.
Related guides covering this topic from other angles — different products, applications, or contexts.
When you're ready to talk to a maker rather than read about it, we'll measure your openings on site, advise honestly, and quote — factory-direct from our Pannimadai works in Coimbatore.