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This help desk is a free resource intended for discussion purposes only. Neither BOMA, its chapters, affiliates, or Extreme Measures Inc.® are responsible for the information, comments or opinions expressed herein. For complete information, refer to the official publications of the standards themselves.

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Measurement of Roof Levels

Carrie Martin
April 10, 2012


Am hoping you can help me.

My company is currently discussing how we should classify/measure our roof levels which commonly have building service areas on them so are accessible for maintenance personnel etc.

We currently measure the interior our office buildings to Method A of Office Buildings: Standard methods of measurement (ANSI/BOMA Z65.1 – 2010)

Should we be including the roof level within our Internal Gross Area calculations so that it becomes part of our rentable space ?

Thankyou in anticipation of your help.

Adam Fingret
Extreme Measures Inc.
April 10, 2012

Hi Carrie,

Unenclosed areas, whether on the roof or elsewhere in the building, do not normally count as IGA or Rentable Area. However, fully enclosed areas such as rooftop mechanical rooms are normally counted as Building Service Area. As such they are incorporated into Rentable Area calculations.

Hope this answers your question.

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