Re: Rate per Square Foot in NJ
$75 /sq foot more material alone is very low, the standard practice is to double the material to get the overall cost but thats more for new construction. most of the additions i do are probably in the range of $175/ft
getting into an additon there are many variables that need to be considered, youll probably have to get an engineer to come in, modifications to the existing roofline to take the additional load of the new roofline tying in. excavation costs and foundation.
your best bet to get an accurate $$ amount is to call your local homebuilders association and ask someone there, this is the least intrusive way of finding out without taking up the time of busy contractors who dont always have time for tire kickers
fire up the saw and make some dust