When measuring floor area where glass constitutes less than 50% of the wall, how is the area determined?

Determining the floor area where glass constitutes less than 50% of the wall is based on standard practices in the field of interior design and architectural measurement. When glass is used as part of a wall and it does not dominate the wall space, the floor area is measured from the inside surface of the exterior wall. This method accounts for the structural integrity and usable space within the room, ensuring precise measurements that are relevant for planning and design purposes.

Measuring from the inside surface provides an accurate representation of the usable floor area for calculations related to space planning, occupancy, and building regulations, and helps designers assess the functional aspects of the space effectively. This approach aligns with how interior environments are typically assessed, allowing for consistency in measurement practices across different kinds of spaces.