Numbering Rooms

The following guidelines were approved by the Space Committee on September 29, 2005. These guidelines will be employed when new buildings are constructed or when renovations of existing buildings necessitate renumbering a section of rooms.

  1. All floors should be numbered in consecutive order.
  2. Rooms in a true basement (basement floor) should be numbered from 1 to 99.
  3. Rooms on the remaining floors should be numbered in the same way. For example, the first floor should be numbered from 100 to 199; the second floor should be numbered 200 to 299; etc.
  4. All rooms should be numbered. This includes mechanical space, restrooms, janitors’ closets, telephone closets, etc. It should be noted that even though all rooms will have a designated number, not all rooms will have number signage outside the room.
  5. Rooms opening onto a main corridor should be numbered with a numeric designation (i.e., they should not contain a letter of the alphabet). Alphabetic designations should be reserved for interior rooms of suites. Suite numbering should start with the letter A and continue in ascending order. The letters I and O should not be used since these alphas are often confused with numbers 1 and 0.
  6. The main entrance to each building level should be numbered 100, 200, 300, etc. depending on the floor level (i.e., main entrance to first floor = 100; main entrance to second floor = 200). This main entrance is usually an open space, foyer, lobby or main reception area, generally thought of as the core of the building.
  7. All circulation space (e.g., stairs, hallways, corridors) should be numbered consecutively, beginning with 1000 (first floor), 2000 (second floor), 3000 (third floor), etc.
  8. Rooms on one wall should be given an even number. Rooms on the opposite wall should be given an odd number.
  9. For large rooms, consideration should be given for future changes. The room numbering scheme should accommodate this by skipping enough numbers to allow for room divisions.
  10. The numbering of parking structures should be handled differently than other buildings. The parking level at ground level would be designated ground level (GL). Those levels below ground level would be designated B1, B2, etc. Those levels above ground level would be designated P1, P2, etc. (Example: a five level parking structure with 2 levels below ground level and two levels above ground level would be numbered: B2, B1, GL, P1, P2.)