The sash should be removed from the old basement window first.
Now cut the old frame with the reciprocating saw.
The old frame is to be pulled from the wall opening. (remove old frame)
The mortar around the opening should be removed with a hammer and chisel.
Now slide a new window into a clean and clear-shaped opening.
Use the shims to keep the new window in the opening fixed in the center.
Once the new window is fixed in the opening, screw it into the frame and into the mudsill.
Apply caulk to the sides and top of the window frame.
Spraying urethane foam on the bottom of the window and on the sill.
Apply a coat of grade primer to all exposed parts of the wooden window and then apply two coats of paint.
Custom hopper windows of the reputed brands can be installed or replaced at any place by following the procedure outlined above. For example basement hopper window installation, hopper basement windows replacement.