Real Estate Analysis and Commentary.

Standardized Property Measuring Guidelines from Fannie Mae 04/01/2022

Appraisers are now required to use the Square Footage-Method for Calculating: ANSI® Z765-2021 (American National Standards Institute®)
measuring standard for measuring, calculating, and reporting above and below grade square footage(s) to determine gross living area (GLA) and
non-GLA areas of subject properties for appraisals requiring interior and exterior inspections with effective dates of April 1, 2022 or later on loans
sold to Fannie Mae.

All footprint sketches and floor plans must be computer-generated (not hand-drawn), indicate all the dimensions needed to calculate the above/
below grade and finished/unfinished square footage of each level and other areas such as a garage, and show the calculations to demonstrate
how the square footage was derived.

Reference:
https://singlefamily.fanniemae.com/media/30266/display#:~:text=Appraisers%20are%20now%20required%20to,areas%20of%20subject%20properties%20for