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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.

FAQ & Read-Me Articles
What are as-built drawings / models?
What is CAD and BIM?
How do I resolve an area dispute?
Where can I get measurement standards publications?
BOMA Office Overview
BOMA Industrial Overview
BOMA Retail Overview
BOMA Multi-Unit Residential Overview
BOMA Gross Areas Overview
BOMA Mixed-Use Overview
IPMS for Office Overview
Alternative Methodologies
Glossary of Industry Terms

BOMA Multi-Unit Residential Standard


In 2010, BOMA International published “Multi-Unit Residential Buildings: Standard Methods of Measurement (2010) or ANSI/BOMA Z65.4-2010.

The primary purpose of the multi-unit residential standard is to provide an objective benchmark in comparing values associated with rental apartments, residential condominiums and other types of community type buildings used for living in. The standard does not pertain to single-unit homes, duplex or triplex buildings, townhomes, row houses, etc.

The standard outlines two distinct methods of calculating multi-unit residential buildings. Method A or the “Gross Method” produces a larger area since it measures each unit including the full thickness of the exterior wall and the full thickness of walls separating living units from common areas. Method B or the “Net Method” measures living units to the inside finished surface of the exterior wall and to the inside surface of walls separating living units from common areas.

Both methods include the areas of private balconies, but balconies are considered “Limited Common Area” and not included in the area of a living unit. The area of balconies are however, included in the Construction Gross Area.