You can also cut the siding back far enough to reach the flange and then install new trim around the new window.
Cutting siding away to remove an exterior windows.
Use a siding removal tool.
Slip the curved end of a vinyl siding zip tool into the seam between two horizontally interlocking runs of siding that you need to remove.
Wedge the pry bar under the trim.
Caulk the new one in using some good urethane sealant and hope that it never fails and that water never gets behind the siding at any point above the window.
If you re intent on disregarding standard installation procedures then use a reciprocating saw to carefully cut around the edge of the window in order to get it out.
The total you get is how much you ll need to cut off the siding.
Pry away from the wall to lift the trim and loosen the nails holding the trim in place.
Do not cut the vinyl off.
Remove all the trim from the wall having the siding replaced.
Work the pry bar along the entire length of trim.
Then subtract that amount from the length of the piece of siding you re going to cut.
Use this tool by inserting it where a piece of vinyl overlaps a piece below it and then sliding it across until you reach the end of the piece.
You might need to wiggle the tool to work it into the.
The third option is to cut between the side of the window frame and the edge of the.
Extract nails keeping the vinyl pieces in place in order to prepare vinyl pieces to be removed.