As you mentioned, you are going to supply services to a government office. It is obvious that you have undergone a bidding process against the tender submitted. I know that any government office would ask for EPF, basic documents, and registrations. In such circumstances, regardless of the number of employees, you must voluntarily register with EPF and ESIC and start contributing. In fact, no government office will be able to release your bill payments unless they audit your compliance every month.