swinging doors except jalousies.
2. Glazing in fixed and sliding panels of sliding door
assemblies and panels in sliding and bifold closet door
3. Glazing in storm doors.
4. Glazing in all unframed swinging doors.
5. Glazing in doors and enclosures for hot tubs, whirlpools,
saunas, steam rooms
to a door where the nearest vertical edge is within a
24-inch (610 mm) arc of the door in a closed position
and whose bottom edge is less than 60 inches (1524
mm) above the floor or walking surface.
7. Glazing in an individual fixed or operable panel, other
than those locations described in Items 5
jamb of a door MUST be tempered. Additionally, if you were creating a bathtub "enclosure" then you would be required to provide tempered glazing. The Residential building code section R308.4 covers this issue. If your window meets one of these conditions then the contractor is right. If not, then you may