Insurance question on Sub2 and Renovations

[Curtis H.]

Hi all, 

Just got a property Sub2 and want to start renovations next week. My question is do I need to have the homeowner insurance squared away before I start letting electricians and plumbers into the property? I would imagine if someone gets hurt on the job I am liable since I own the home now and did not have insurance in my name yet?

Also, when I call the new company and get the previous homeowners added as a secondary on my new policy, what do I NOT tell them? I don't want alarms to go off. Some times you don't know what you don't know. 

Curtis