@Gilbert Ross Jr
J Scott and I are not trying to be smart alecks. I have been a professional estimator for many years. J Scott has developed a strong residential business and written a book about estimating costs.
Within my market, one neighborhood may get away with laminate countertops while a few blocks away you must use granite if you are going to sell. In both cases they might be considered medium rehabs.
A house built before 1980 may require abatement. A house built before 1970 may require new wiring.
Some people always replace a roof while others go case by case.
We make it a rule to change out windows on houses over 20 years of age for energy efficiency reasons.
My point about location is this: in Austin a carpenter may get charged out at $30/mh while in San Francisco a carpenter gets charged at $60/mh.
Really, it is very dangerous to try to price renovations with average prices or square foot prices. It i seven more dangerous to get people to say they spend $20k for a renovation without expounding on size, age of house, and scope of work included.