The first digit of a room number indicates the floor on which the room is  located. The level bearing the number 1 as its first digit should be the  uppermost floor entered at grade or one half flight above grade.

1. In a building with only one dividing corridor, room numbers should flow in  ascending order from one end of the building to the other. In a building with  a more complex corridor system, numbers should flow in ascending order in a  clockwise direction from the main entrance.
2. Room numbers should be assigned so that odd numbers are on one side of the  corridor and even numbers on the other.
3. To the greatest extent possible, and without creating other  inconsistencies, rooms with the same digits in the last two positions should  be located in the same position in the building. Thus 001, 101, 201, 301,  etc., occur in a vertical stack.
4. Skip numbers as appropriate in order to reserve numbers for future use.  Most buildings undergo renovation many times; and when, as is often the case,  larger spaces are divided into smaller spaces, new room numbers will be  needed. Having numbers in reserve will avoid the need to renumber an entire  level. Windows, columns, and other structural features offer keys to possible  future wall placement.
5. One room must have only one number regardless of the number of doors  opening into it.
6. Rooms entered from a main corridor or lobby receive numbers with no suffix  (101, 502, 331, etc.). Rooms within a suite always are numbered with the  entrance room number plus an alpha suffix (101A, 101B, 101C, etc.) beginning  with the room closest to the main entrance and proceeding in a clockwise  direction.
7. All rooms except main corridors, stairs, and elevators should be numbered  sequentially (skipping numbers as suggested by point number 5 above). This  practice includes public bathrooms, mechanical rooms, janitor closets.  Corridors, stairs, and elevators (at the lowest stopping level only) are  always numbered with the appropriate floor level followed by the number 99 and  a suffix where needed.
8. All rooms except main corridors, stairs, and elevators should be numbered sequentially (skipping numbers as suggested by point number 5 above).  This practice includes public bathrooms, mechanical rooms, and janitor closets.  Corridors, stairs, and elevators (at the lowest stopping level only) are always numbered with the appropriate floor level followed by the number 99 and a suffix where needed. 

Cubicle Numbering 

Effective April 2007, our office had begun numbering cubicles. Cubicles will be defined as areas separated by partial height walls and or prefabricated furniture panels. The use of book cases and desks do not make up a cubicle.

Cubicles will be numbered the same as any other room, using the whole number of the room the cubicle resides followed by an alpha suffix (101A, 101B, 101C, etc.). In an area with more than 23 (skipping I, O, and Q) cubicles, continue on with cubicle 24, giving it a double alpha starting with AA (101AA, 101AB, 101AC, etc.). If a room with an alpha suffix contains cubicles, the cubicles should be numbered using the said room number followed by another alpha character (101TA, 101TB, 101TC, etc.).

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