The base square footage is all of the space on your first floor, plus garages and covered porches. Typically, the common reffered to sqft of your house is based on just the heated and cooled interior.
If you live in Rutherford County you can look up the measurements on this public website: https://secured.rutherfordcountytn.gov/OFS/WP/Home
- Search your property and then select it
- Select the image resembling a floorplan and then add the numbers in parentheses.
If you live in Williamson County you can look up the base square footage on this public website: https://inigo.williamson-tn.org/property_search/
- Search your property and then select it
- Look for the largest number under the "Base" column