I didn't have the sq footage either and they wanted to help me.

The square footage of the house, does not represent the square footage of the roof.  

If you are selling a 15,000 square foot mansion your contingency period will be long: lots of time to inspect all of the square footage, lots of individual experts needed to evaluate the different components and lots of time needed to complete the mortgage underwrite because of the size of the loan. 

We have a giant back yard and Ive recently discovered that I have just enough square footage on my lot to subdivide and develop the new lot. 

@Michael Algarin I'm not a wholesaler, but I would ask if the comps you looked at are comparable, meaning same sq footage, same number of bedrooms/bathrooms, etc.

Missed the square footage.

Starting to realize house hacking a quad may be a pipe dream with a baby (and 2nd in the near future) due to layout/square footage issues.To your comments;]1) Rent being BEST case scenario; in this market do you foresee rents decreasing?

It was insured for $600k based on construction and square footage.  

The counties that do are very detailed and you can search based on sale date, sq. footage, age of the home, type of home, etc.

In this case, like you said, it was bought "liveable" and after the remodel, it was more "liveable" but is the underwriter really going to be able to quantify that when the square footage hasn't changed?