A useful roofing estimate
Flashing and wall transitions
Step flashing and counterflashing protect roof-to-wall and chimney joints. Damaged masonry or siding can need work beyond the roof covering.
Decking and insulation
Unsound decking cannot be covered over as though it were solid. On a low-slope roof, wet insulation needs evaluation and removal where required rather than being hidden under a coating.
Equipment and drainage
Commercial curbs, mechanical equipment, drains and overflow routes need coordination. Roofing work does not silently include moving electrical or mechanical systems.
Scope, materials and terms belong together in the proposal.