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I am replacing this window and am trying to figure out where I should be measuring from (to know what a suitable replacement for it should be):

enter image description here

  • For the height/vertical measurement, should I be measuring from point A to H, or from D to J, or between some other two places?
  • For the width/horizontal measurement, should I be measuring from B to the same board on the other side of the window, or between some other two places?

Thanks in advance!

hotmeatballsoup
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1 Answers1

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Depends on whether you're redoing the jambs and trim. Many insta-window replacement companies reuse jambs so they don't need to get into casing, extension jambs, and exterior trim at all. It allows for a quick, relatively inexpensive job, but smaller windows, as around an inch of space is lost on all sides. It also leaves any existing energy efficiency issues in place, such as air leaks and insulation deficiencies.

So, you decide. If you're willing to rework the siding trim and would prefer to modernize energy efficiency, you'd measure to the framing. If you're keeping the original jambs, measure those. It's also possible that you'd decide on some combination of those based on your trim details.

Sometimes you have to take things apart to come to a conclusion.

Related resource: Window anatomy, by example

isherwood
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