What drawings tell you and what they do not
Plans give you area, room count, amenity fixtures, floor finishes and the general circulation layout. That is enough to draft a task schedule and to estimate the bulk of the work with reasonable confidence. The finishes schedule is particularly valuable, because floor and surface materials determine method and periodic cycles, and getting them from a document is far more reliable than guessing from a photograph.
What drawings cannot tell you is how the building will be used. Headcount, visitor numbers, the hours the space is occupied, where people actually enter and how waste volumes fall are all behavioural. Estimating them is unavoidable, but they should be written as stated assumptions rather than buried in a price, so that both parties know which parts of the scope are provisional. Naming them also makes the later review straightforward, because everyone can see what was estimated and what was measured.
