I've known a few people who had to do this and in the poconos (cheaper labor costs) it runs about $15-20K for full replacement (remove old, add new system, plumbing, permits, use of heavy equipment, etc). 

Joe Fairless's Best Ever Conference (Denver) and Real Estate Guys' Events (Dallas & others) are great.

You knowing nothing about the niche doesn't make you a no value laborer.

@Joe Forte welcome aboard!

Hey @Denishia Harper you should talk to @Joe Mueller. 

@Joe Villeneuve is a friggin alien time traveller!!

There are 2 well-attended meetups in the baltimore area1) Baltimore REIAhttps://www.baltimorereia.com/- good folks there, especially the meetup owner Joe.

Normally, a roof is considered an integral part of the structure and would be subject to depreciation over 27.5 years or about 3.6% ($3,600) of the total project cost per year.But whenever I have a roof done I ask my roofer to itemize the cost of labor and disposal associated with tearing off the old roof and dumping the worn out material. 

I read in Brandon Turner's book that I can find out the cost of materials and double it to get a good estimate of the total cost of materials+labor together.

@Joe Splitrock You need to look a little deeper in Cleveland heights.