If you can't agree on how much it would cost to replace the roof with the seller - they can invite their own contractor and get estimates, so that you can compare notes and agree on something reasonable based on 2 opinions.
Honestly I would not personally walk away from a house just for the roof, you did not mention anything else so I am assuming the other issues are "acceptable". No matter what house you choose, there will always be deterioration due to normal wear just like a second hand car but the home still functions well. If you want a perfect house, you will need to purchase new construction and even those can be questionable at times. The primary purpose of a typical home inspection is to know what you are purchasing and budget for minor repairs that can be major issues in the future if left unattended. Depending on the price, you might be able to get the seller to do some or all of the pairs or none at all.
All the best,
First........get a written estimate for the replacement cost from a roofer (remember, home inspectors are not always the final word - they give you an overview of the condition of the house - you need to follow up with an "expert" to evaluate any specific issue).....then..factor whatever you discover into your offer..............or....ask for a credit at closing from the seller..............or..........ask the seller to do the roof if it actually needs to be replaced.
Often the home inspector will recommend replacement when anything is " beyond, or at, the end of its life epectancy".
That's pretty standard verbiage on any home inspection report.
Do your due dillgence..............then decide what is the best way to proceed.
Tom Brady SFR, e-Pro, SRES, GREEN
Licensed Real Estate Salesperson
Notary Public, Ret. NYPD Lt.
"We treat you like family!"
Charles Rutenberg Realty, Inc.
255 Executive Plaza - Suite 104
Plainview, New York 11803