How does Buildiante keep takeoff measurements accurate?

A measured quantity eventually becomes a priced BOQ position, which eventually becomes a real cost — so it's worth being precise about where that number actually comes from and when it can change.

The server recomputes every value — it never trusts what the browser sends

When you click points on a PDF drawing, what's actually stored is the raw geometry — the pixel points you clicked, plus that page's calibrated scale. The length, area, or count you see is calculated from that raw geometry on the server, not accepted as a number the browser reports. The same is true for a BIM element's quantities: they come from the model's own IFC data, read server-side when the model is parsed. Either way, the quantity that lands in your BOQ is calculated from the source, not typed in by hand or trusted from the client.

Recalibrating a page updates its measurements — except the ones already in a BOQ

Because a PDF measurement is stored as raw points plus a page scale, changing that page's scale recalculates every measurement on it — if your first calibration was off and you fix it, every length, area, and count on that page updates to match. But a measurement that's already been sent into a BOQ keeps the quantity it was given at the moment it was added; the BOQ position doesn't silently change value later just because you recalibrated the page it came from. If a correction needs to reach the BOQ too, you'll need to update that position the same way you'd update any other — see adding sections and positions.

One measurement, one BOQ position

Buildiante never groups several measurements or elements into a single summed BOQ line. Every position it creates traces back to exactly one measurement on a drawing or one element in a model — so if a quantity on the BOQ looks wrong, there's always a single, specific measurement to go check, not an aggregate you'd have to unpick by hand.

Who can do this

Takeoff follows the same split as BOQ, since it feeds BOQ positions directly: Owner, Admin, and Estimator can upload drawings and models and take measurements; Project Manager can view everything but not create or delete; Field Supervisor has no access to Takeoff at all. See what each role controls.