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When is keeping the old window frame a false economy?
A retrofit insert can limit how much trim and wall finish gets disturbed, but that only seems like a good trade if the existing frame is sound. What signs of moisture or deterioration would make you favor a full-frame replacement instead, and how much can an installer reliably assess without removing the old frame?
I’d also like to understand what each method leaves visible or accessible. Does keeping the frame usually mean less interior or exterior trim work, and could it leave a flashing or water-damage problem hidden? If you’ve compared both approaches, what inspection findings actually changed the recommendation?
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A room-side inspection can reveal clues like soft or swollen wood, staining, and failed joints, but the absence of visible damage can’t rule out decay or a flashing problem hidden behind the frame. If the condition of those concealed areas would determine whether an insert is appropriate, a small exploratory opening may be needed before committing; otherwise, the insert could leave damage that has to be dealt with later.