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Hidden sill rot can change the whole window-install price
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A low installation bid can look very different if concealed sill or framing damage turns up once the old window is out. How do you usually document what’s been uncovered before doing repair work, and agree on the added scope and price?
I’d want to know which parts are included in the original installation and which might be separate, especially repair labor and materials, plus interior or exterior trim and finish restoration. If damage is found mid-install, what’s a sensible way to leave the opening protected while the repair and revised cost are sorted out? I’m interested in how people compare a DIY budget with a contractor’s quote when that kind of uncertainty isn’t fully priced in.
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For the DIY comparison, I’d separate the known window-install costs from a contingency for concealed rot. Size that contingency around the work you’d genuinely take on yourself; if repairing framing or restoring trim would mean hiring someone, include that labor too. Otherwise, you’re comparing a contractor’s full scope with a DIY budget that counts only materials, which can make the apparent savings misleading.
A dated change order is a straightforward way to separate the original installation price from added work. It can describe the damage that’s visible, spell out the proposed repair and any trim or finish work, and state the price or how it’ll be calculated. Then the owner can approve that scope before the repair starts. Would you also ask the contractor to note what remains excluded, so the change doesn’t leave the finish work ambiguous?
If the opening has to stay exposed while the added work is being priced, a securely fastened, weather-resistant temporary cover can keep rain out. It should shed water outward and not trap moisture against the framing. That buys some protection, but it doesn’t settle what repair or finish work is included in the revised scope.
The contractor comparison only works if both numbers carry the same allowance for the unknown. If their quote includes a set allowance for concealed damage, add an equivalent reserve to the DIY total too. Otherwise, DIY can look cheaper just because it leaves that risk off the page.
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