The opportunity to add more glass area in any home
is an opportunity to let in more light and ventilation
and improve the view. Adding more glass area can be
done by removing a single window and adding a bay
or bow window, or even a wider combination window.
Installing a patio door not only increases the glass
size, but will offer another entry/exit point to add
deck or sunroom access.
Today’s high performance windows and doors limit
any increase in energy consumption that might occur
by making the opening bigger and the weather strip-
ping, glazing and precision design will out-perform
smaller, old windows.
Considerations
when Replacing 
Windows with
Doors
1. There must be room
for the new window or
door.
Beyond measuring for
the width and height of
the new window or door,
it is important to consid-
er the need for a header
above the new
window, and
to be sure
electrical and
heat wires,
pipes and
ducts are not
in the way or
are properly
moved or
repositioned
to accommo-
date the new
unit.
Window Fitters Guide to Window Installation
123                  Contents ©2022-Do not reproduce without permission
Replacing a Window
with a Door
SAMPLE MANUAL

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