Most uPVC window problems trace back to installation, not the window. Here are the mistakes that cause them.
A well-made window fitted badly performs worse than an average window fitted well. The frame must sit true, be fixed securely, and be sealed completely — miss any of those and the window drafts, leaks, or sticks.
This is why we fit with our own team rather than subcontract. Every one of these mistakes is invisible on day one and obvious in a year — and by then the installer's gone.
Frames not seated true or square, under-fixing into the structure, incomplete sealing, blocked drainage, hardware left unadjusted, and skipped reinforcement on large frames.
Drafts, water ingress, stiff operation, or visible gaps — usually appearing months later rather than immediately.
Because these mistakes are invisible on day one and obvious in a year. Keeping fitting in-house is how we stay accountable for it.
Related guides covering this topic from other angles — different products, applications, or contexts.
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