Service tax liability on labour job work

I am a builder & engaged in government building/contruction works contract.

I am registered with DVAT department & not registered with Service Tax Department.

I quarterly file my DVAT returns.

Recently, I did a private building job work i.e. did some construction/renovation for a private party/indivudual.

I only did labour work. All the material was owned & supplied by the party.

I charged total Rs. 9.00 lakhs for the job work.

I took the entire payment by bank cheque.

I did not issue any invoice nor did I charge any kind of tax.

Would Service Tax be applicable in my case? If yes, how much?

What would be the DVAT liability in my case?