Buyers should consider everything when making an offer. The best person to answer your question, is the buyer's agent that you are currently using. If you are not using the expertise of a buyer's agent, and going straight with the listing agent,; then, that's another story altogether.
For example, is the house priced right? Would you lose the offer if you ask for too much in a multiple offers market? Is the roof still serviceable, or too many repairs on it?
And finally, how important is the house to you, if the roof stays as it is?
Talk to your agent about your concerns. If you do not have an agent, or have not place an offer on a house, contact an expert on this board to represent you, or contact me.
Realtor, Certified HAFA Specialist (CHS )
Coldwell Banker Residential
As already answered most roofs are good for 30-50yrs.
Just get a home warranty & read the fine print on what is covered should your furnace die on you.
Shoot me an email directly if you'd like to talk about this further, I don't look back on this same Trulia thread for answers posted after mine.
Emily S. Knell
Realtor Since 1996
Realty ONE Group
Short Sale Specialist - 100% success rate
Also, consider the market trend wherein the property is located. The law of supply and demand should be taken into consideration.
A furnace can last a long time 25-50 years, so does a roof depending on
type of material used .
Do a roof inspection and figure out the expected life of the roof and call out
a Furnace inspection company.
If the market is rising a seller is unlikely to give you credit or lower the price.
If the market is flat or there are plenty of homes then go ahead.
What does your Realtor advise.
Have you done comparables of similar homes ?