Contractors / Permits

[Alyse Oz]

I just purchased a multi family home that is in need of rehab.  Instead of hiring one major contractor, I was planning on hiring per project because I thought it would be cheaper. For example, one company will do the roofing, another will do electrical etc.  is this a good idea?  I’m using HomeAdvisor but subcontractors aren’t very responsive.  

Also when do I need to worry about permits, like use and occupancy etc.  

Any advice or contractor recommendations would be greatly appreciated!