Which value is a typical grossing factor for a hospital-type facility?

• A. 1.1
• B. 1.5
• C. 1.75
• D. 2.0

Answer: (C)

The grossing factor is the multiplier used to convert net program area into gross floor area, to account for spaces not directly part of the functional rooms—things like corridors, lobbies, nurse stations, waiting areas, mechanical and service rooms, and vertical circulation.

For a hospital-type facility, these non-programmed spaces are substantial because patient care areas are connected by long corridors, there are extensive support and service areas, and multiple mechanical and utility spaces are required. That’s why the typical grossing factor for hospitals sits in the higher range, around 1.75. It reflects the need to include a large amount of circulation and support space beyond the core patient and clinical rooms without overestimating excessively.

If the net program area is 60,000 square feet, applying a factor of 1.75 yields roughly 105,000 square feet of gross area. Values like 1.1 would under-represent the amount of non-programmed space in a hospital, 1.5 is more characteristic of smaller clinics or less intensive facilities, and 2.0 would overstate the additional space for a standard hospital.

So 1.75 is the typical, representative grossing factor for a hospital-type facility.