I hope you are having a wonderful day.  When trying to maximize property potential, what size total sq footage would you look for if you want the potential to add a bedroom?  For instance, if a 3 bedroom home with 2 baths is 1,800 sq ft would you see potential to add a fourth bedroom ie convert a den to a bedroom?

No potential in adding a 4th bedroom, a 3 bed is the ideal for a rental. If it is a flip  it depends entirely on the local market. 

@Charlotte Jackson

Unless there is a great demand for 4 bedroom rentals, I think 2 and 3 bedrooms are optimal.  Buying a 2 bedroom and converting to a 3 bedroom is a plan I have executed.  There is a big upside there.  I agree with @Thomas S. not much of a demand for 4 bedrooms unless your flipping the property.

Good Luck.  

Thanks, Gentlemen.

Thanks, Gentlemen.