Comment: The condition of your windows

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The condition of your windows

The condition of your windows and siding is important. You can easily drop 20K or more just replacing those. Also check the quality of construction in the unfinished portion of the basement. That'll give you an idea of what to expect elsewhere. We had huge holes cut in the beams for ductwork that shouldn't have been there. Not too big of a deal, but it caused some squeaks in the flooring. Make sure the HVAC system works good as well.