As per the ESI Act, ESIC is payable on all the wages paid for any type of labor work on the premises or outside the premises. However, based on my knowledge, if the work is done within your premises and by your employees, then ESIC is not payable. If the labor works are done outside your premises and you have a gate pass or entry of the materials at the gate, then you are not eligible for ESIC payments. Before proceeding, you should confirm with your accounts department because, according to their bills, it is the responsibility of the accounts department to deduct ESIC and TDS for every job or labor work from the bills before payment.
Regards,
Shamsher