GC for adding bedrooms to duplex

[Ali Harris]

Hi, 

I may be in a position to acquire a duplex where each unit is 1 bed/ 1 bath.

The tenant is about to move out of one of the units and I was wondering how viable will it be to either add 1 bedroom to that unit or may be add 2 beds and 1 bath for increased case flow. 

any gotchas I should be aware of?

If it is a viable option, any idea of the rough costs involved? Any know can recommend a General Contractor they have used?