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The American Measurement Standard is an authoritative measurement standard for use with single-family dwellings. The AMS C42129-2009 is a voluntary guide developed exclusively for the measurement, calculation, and communication of square footage in residential dwellings. This standard defines eight specific categories and three levels of finish for the reporting of all space associated with a residential dwelling. The AMS helps to establish common and logical definitions of "finished square footage" and "gross living area." The methodology enclosed within the American Measurement Standard was compiled and edited by a consensus of real estate professionals (with over 175 years combined experience), including real estate agents, appraisers, assessors, home builders and architects, and is based specifically on the exterior dimensions of a dwelling. The AMS contains over three times more specific home measurement details than any other square footage guideline, including numerous illustrations and examples. Provides acceptable square footage calculations for use in residential mortgage appraisals, and its principles and practices has been used for decades in professional appraisal reports prepared for the FHA, HUD, VA, Fannie Mae and Freddie Mac. The American Measurement Standard (guidelines and illustrations)were prepared with the intent of assisting agents, appraisers, and others, with the fundamental knowledge of measuring residential square footage. The American Measurement Standard allows all real estate professionals to create and communicate in one specific real estate language.


  • Thomas, David Hampton (2009) - The American Measurement Standard - ISBN 9780578002446. "Size Matters-Residential Square Footage." ISBN 9780615174013 and "Size Matters-Appraiser's Edition." ISBN 9780615267173. Realtor Magazine "In Search of A Standard." September 2008.[1] The Appraisal Journal - Size Matters [Page 285-Book Review] McKissock Real Estate School - Size Matters-Residential Square Footage [based on the {American Measurement Standard}.Approved in 36 states for state sponsored continuing education credit. Appraisers CE course based on AMS pending state approvals 03/10. [2] Colorado Real Estate Commission - Size Matters Kansasn Real Estate Commission: Texas Real Estate Commission Realtor University - Webinar Series Size Matters Based on the AMS



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