Ever wondered how RAHB Matrix determines which rooms are principal rooms and how they are counted in the Room Totals? Below is the formula explained:

The following Rooms that are above grade are counted, excluding NON-principal rooms (see below). This will determine the Total Rooms value.

  • LLP (portion above/below grade)
  • M (main)
  • 2 (second floor)
  • 3 (third floor), etc.

The following Rooms on the lower level will not be added to the Total count. They do not require size, regardless of room code.

  • B (basement)
  • LL (second basement/lower level)

The following Non-principal Rooms will not be added to the Total count. They do not require size, regardless level.

  • Attic
  • Bathroom
  • Coldroom
  • Ensuite
  • Foyer
  • Laundry room
  • Loft
  • Mud room
  • Pantry
  • Sauna
  • Storage room
  • Sunroom
  • Utility room
  • Wine cellar
  • Workshop
  • Other