Is adding square footage a no-brainer???

[Chris Allen]

It seems most rehabbers abound getting into larger construction projects and add square footage, but this seems like it's usually the best bang for the buck. The average per sf sale cost in my area can be easily 2x the per sf construction. With these numbers there are many homes that I see where one could pay retail and still make large profits adding square footage, making the number of available deals much larger than for those seeking only cosmetic upgrades. How does the average per square foot construction cost compare to the average per square foot sale cost in your area? I can build for $100/ SF and sell for $250/ SF...