Construction Costs Measurement for SFR

[Jonathan Orr]

I have a lot that I am looking to develop into a tract of Single Family homes. I have ran very rough numbers and good profit in the deal. However I am a little uncomfortable with my construction costs since I have never done SFR. Just for simplicity I have about $175-200/sq ft for construction of the SFR units, this is based off of commercial I have done. If anyone has a way they estimate construction costs or a program they use if they are not a contractor or estimator? Located in Southern California FYI