Can I negotiate post-inspection the house sold as-is?

[Alla Minchenkov]

We are considering buying a house, which was listed as-is. The house has a lot of issues and requires a lot of work. Our offer has inspection contingency with void only, given the house was sold as-is. Can we go back with an addendum to include the inspection contingency with the right to negotiate or void? Or shall we give head ups to the seller that we will need to negotiate based on inspection findings to make the deal happen? Please advise. Thank you.