converting 2/1 into 3/2 homes

[Bethany T.]

I know that 3/2's are what most renters and lease-purchasers are looking for but our market has a lot of very affordable 2/1's. I have seen some homes that have literally added a "box" on the back that contains a new "master suite" effectively converting the home into a 3/2. Has anyone come across an effective/cost efficient way of doing this? In the area of town we focus on, 3/2's go for 30-50K more than a 2/1 (3/1's only 10-25K more than a 2/1 or 2/2).