Reapplying for Secret Security Clearance

I was working as contractor in 2013 I renewed my secret security clearance. I stopped working for that contractor in 2014 and haven’t had a job with a clearance since then. I’ve been hired to work with another contractor that will make me get my security clearance again. My question is will there be a full background investigation and I have to fill out that lengthy SF whatever form?

Yes and now the form (SF 86 2016) is even longer.

your basicly starting over and its a long,long process