Seems to me lately, the windows are often too large and too low. I’m guessing windows are less per square foot than walls but my objection isn’t about costs.
Low windows restrict furniture placement which in turn, tends to dictate traffic patterns. Window coverings require sufficient access for opening and closing drapes/blinds. Modern sash windows fold inward for cleaning — this must also be considered if, for example indoor shutters are used. Privacy and safety are dependent on good window placement. Low windows imply more insect problems as the insects are usually found closer to the ground.
I suggest the bottom of the windows should be high enough to allow a sofa along the windowed wall. Similar considerations should be given for bed (and headboard) placement in bedrooms.
Large window openings facing the south and even more so, the west, greatly affect the heating/cooling load on the house. Despite proper air conditioning sizing, rooms with windows facing the afternoon sun may be impossible to cool sufficiently. In extreme cases, the window will be closed and draped to block the sun thereby defeating the purpose of the window.
Building code requirements may vary somewhat but certain rooms are required to have egress windows.
Here is an excerpt from the 2006 International Residential Code:
“Basements and every sleeping room shall have at least one operable emergency escape and rescue opening. Such opening shall open directly into a public street, public alley, yard or court. Where basements contain one or more sleeping rooms, emergency egress and rescue openings shall be required in each sleeping room, but shall not be required in adjoining areas of the basement. Where emergency escape and rescue openings are provided they shall have a sill height of not more than 44 inches (1118 mm) above the floor.
R310.1.1 Minimum Opening Area.
All emergency escape and rescue openings shall have a minimum net clear opening of 5.7 square feet (0.530 m2). Exception: Grade floor openings shall have a minimum net clear opening of 5 square feet (0.465 m2).
R310.1.2 Minimum Opening Height.
The minimum net clear opening height shall be 24 inches (610 mm).
R310.1.3 Minimum Opening Width.
The minimum net clear opening width shall be 20 inches (508 mm).
R310.1.4 Operational Constraints.
Emergency escape and rescue openings shall be operational from the inside of the room without the use of keys, tools or special knowledge.”