Cost to build a Duplex

[John Mason Wallace]

I'm looking to start building "missing middle" housing in the Belmont neighborhood of Charlotte, NC. It's one of the few pockets of the inner neighborhoods that are affordable.... though, that's quickly changing. The lots are now going around 100,000K a lot.

A shotgun styled duplex might do the job, a little less than 900 per unit. I can get the architectural drawings for around 1500$.

The one issue is I'm having trouble getting an idea of what the costs for building a duplex are. I'm looking at around $110 per sf, though I'm hoping it could be a bit cheaper.