At a minimum, subs should have policies for workers’ compensation, general liability, and auto (if they have owned, hired, or non-owned vehicles). More specifically, GCs should ensure that their subs are carrying appropriate minimum limits. Typically, limits of $1 million per occurrence and $2 million aggregate are adequate for general liability.
As a GC, you should work with your agent to determine if your requirements should be higher. Think about the price range of the homes you are building and ask yourself, “How much damage can my subs do?” If you build $2 million homes, then you definitely need your subs to carry higher limits. In your subcontractor agreement, you should require that your company is named as an additional insured on the subs’ general liability policies. For answers to all of your coverage questions, contact your insurance agent in addition to discussing with legal counsel as needed.