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International Standard Calculation Rules for Subarea

Learn the calculation rules applied to subareas when calculation factors are used.

Addition of subareas, equal which calculation factor

Unfinished Area (UA) = Unfinished Area + Subarea

  • The total unfinished area results from the total area of the room and the subareas.
  • Does not take reductions into account.
  • Does not take calculation factors into account.

Net Room Area (NRA) = Net Room Area + Subarea

  • The total net room area results from the total area of the room and the subareas.
  • Takes reductions into account.
  • Does not take calculation factors into account.

Living Area (LA) = Living Area + Calculation Factor % x Subarea

  • The total living area results from the total area of the room and the subareas.
  • Takes reductions into account.
  • Takes calculation factors into account.

Subtraction of subareas with calculation factor 100%

Unfinished Area (UA) = Unfinished Area - Subarea

  • The total unfinished area results from the difference of the room area and the subareas.
  • Does not take reductions into account.
  • Does not take calculation factors into account.

Net Room Area (NRA) = Net Room Area - Subarea

  • The total net room area results from the difference of the room area and the subareas.
  • Takes reductions into account.
  • Does not take calculation factors into account.

Living Area (LA) = Living Area - Subarea

  • The total living area results from the difference of the room area and the subareas.
  • Takes reductions into account.
  • Takes calculation factors into account.

Subtraction of subareas with calculation factor 0% or 50% (≠100 %)

Unfinished Area (UA) = Unfinished Area

  • The total unfinished area results from the room area.
  • Does not take reductions into account.
  • Does not take calculation factors into account.

Net Room Area (NRA) = Net Room Area

  • The total net room area results from the room area.
  • Takes reductions into account.
  • Does not take calculation factors into account.

Living Area (LA) = Living Area - Calculation Factor % x Subarea

  • The total living area results from the room area.
  • Takes reductions into account.
  • Takes calculation factors into account.
  • A calculation factor of -50% subtracts the area by 50%, and a calculation factor of -0 % subtracts the area completely.

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