What is a "reasonable" profit and overhead surcharge when my general
contractor has a sub-contractor do work for him? We're doing a large
residential house by "time and materials".

Reasonable? that depends on a plethora of issues. Roofers workman's
compensation is higher than a plumber for example.


If it's time and materials, then the subcontractor counts as
"materials". Why should there be a surcharge?