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May 23, 2017
What will be the difference in measurements for new installation vs. replacement insert windows.
I had windows measured for replacement inserts but want to go with new construction, since we are replacing the siding as well. I want to know the actual size I will be looking for so I can get pricing.

Carole Weber of Weber Windows PRO answered:

May 30, 2017

Hi Peggy,

It can vary widely based on what kind of window you have now (aluminum, wood, vinyl, etcl) as well as if you have brickmould casing on the exterior etc.  It can be up to 5" different.  Just let the professionals who are going to order your windows take exact measurements for you so they can take all of that into consideration.  I agree with Michael that you should defnitely NOT order based on those measurements. You don't want to be repsonsible for purchasing wrong sized product if it doesn't fit. They can't be returned.

Michael Woods of HomePros PRO answered:

May 23, 2017

Hi Peggy,

The difference really varies based on the existing windows. For pricing purposes, you could add a couple inches to the L and W. However, DO NOT order windows based on those numbers.

Jul 25, 2017

They are definitely measured differently.  The insert window you would measure inside the existint window frame, which in most cases is built out of 3/4" lumber all the way around.  For a full replacement window, you can remove the interior casing and include that frame within your measurement.  In regards to our answer, better late than never.  If this process becomes a pain in the "sash" simply consult a professional.  Make it a great day!

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