Before you list your home for sale--read these two articles--avoid legal issues that may arise from improper measuring--like Mike Holmes says "Do it Right".
Here's the link to the entire artilce-- click the link to read the article.
And here's the new guidelines REALTORS are to use--
Consistent, Accurate, Trustworthy: Getting the Residential
Measurement Standard (RMS) Right
You can read the full article here--