These may be bought at the mill ready made. Very few carpenters make
their own, as they are staple articles coming in standard sizes.
Second-hand sashes and frames may often be bought at very reasonable
rates, and it never pays to make either.
Set the frames in the openings left for them, and nail to studs. To
make sure that the fit between frames and openings shall be right, it
is best to take the plans to the mill, and explain to the mill man
just what is desired.