QUESTION:   What's the typical cost per square foot to add on a room addition?
ANSWER:  Remodeling is such a unique and custom form of construction that it is impossible to accurately quote a project by square foot price without knowing all specifications of the job. Prices can vary dramatically depending upon several factors including size, location, materials used, demolition to existing house, tie-ins to existing, etc. Some additions are built for less than $100.00 per square foot, while others at $200.00 per square foot, or more.
Have you ever tried to buy an automobile per square foot? Which do you think would cost more to buy per square foot - a Chevy Cavalier or Rolls Royce Convertible? It's pretty obvious that one vehicle will cost five to ten times the amount per square foot as the other. The same is true with room additions and other remodeling projects. It all depends on specific details as noted above.
The best way to proceed is to discuss your ideas with a qualified remodeling contractor. He or she can give you a ballpark estimate based upon the type of job involved. If after you receive that estimate you are serious about an addition, the contractor will be glad to figure an accurate quote you can use to make your decision.