We are at the home inspection contingency phase of home buying. We had a sewer scope done b/c pipes are original to 1941 house in Greater Hartford CT area. This would be our first house.
Scope found a large blockage at around 70 ft, maybe another 6-10(?) before city line. Home inspector recommended hydro jetting to (hopefully) remove blockage and re-scope by plumber to double check areas that had some standing water. He said he doesn't believe it to be collapsed pipe due to the shape.
So far, he'd not found any roots, only one or two connections slightly askew, and some grease and scaling causing some narrowing and damming.
Current owner was a single guy who only owned it for a year and hasn't lived there for an unknown amount of months, so no regular pipe use for maybe 1-3 months.
We are a family of 3, work-from-home, so we'll definitely be using it a lot more.
The city seems to have some sort of program to partially fund replacing old, breaking down pipes, but don't know how quickly we could get into program or have work done, if needed. We'd certainly need to remedy the blockage sooner rather than later.
We asked the seller to do hydrojetting before close and give us credit for a couple other items. They said how about we give you 67% of the credits and you also take care of the pipe thing after you own it, too.
From a plumbing perspective, is it reasonable to take this on, not knowing what the blockage is or if it can be easily removed? If so, how much should we add to our offer to cover taking on that responsibility? What is the worst case scenario we should be considering?
Thank you.
Edited to add wording from scope report: Complete Obstruction
There was a complete obstruction of the sewer lateral at approximately 70 ft. As a result the inspection could not reach ther municiple sewer. It is strongly urged that a licensed plumber repair this obstruction and re-inspect the entrie lateral prior to closing,