Capture spend as it happens, against the project it belongs to, and watch margin in real time.
Site cash leaks through small, unrecorded payments — a truck here, a mazdoor there — until the job’s real cost is anyone’s guess. TameerBook captures each cost against its project the moment it happens.
Categorise spend, attach it to the right job, and see the gap between what you quoted and what you have actually spent while there is still time to act.