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I've got two bedrooms in my basement with no egress windows. I measured the concrete opening of both and found the one flush with the parging to be 20"x37", but the one that was recessed in with the wooden frame had a concrete opening of 20.5"x37". I got a quote for these sizes from a local company that does custom fit egress windows, and they are just big enough to meet the minimum egress requirements. I've held off on ordering them because I'm paranoid that I measured them wrong and if I order the wrong size, I'll be out a bunch of money. The quote just gave me two windows that fit a 20"x37" opening, so if one is off by 1/2", is that easy to fix?

[window flush with parging][1] window recessed

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  • You would be best served by asking the manufacturer these questions . Generally a rough opening that is 1/2 inch too big is not a great issue. That is why shims are made.
    – RMDman
    Commented Aug 4 at 15:14

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I hope I'm understanding correctly, but if you're saying that one of your window rough openings is 1/2" too big for the window, then you'll be fine. Shimming and spray foaming will lock the window in perfectly. You might need a tiny bit of wood trim on the outside to cover a gap.

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