Septic conversion after due diligence before closing?

Seller wants to wait to convert septic to sewer lines till after our due diligence. (once our earnest money is forfeited) but before closing does this sound ok? We agreed to extend the closing based on completion of the transfer to septic.

Your question makes no sense. Are you trying to say your converting from septic to city sewer?

sorry yes owner will be converting from septic to city sewer