The change order, priced from the model.
Draw the space in 3D and the quote prices itself. When the plan changes, Brick diffs the model against what the client approved and prices exactly what moved.

Every number traceable to the wall that produced it
Quantities derive from the drawn geometry. Click a priced line and the wall, floor, or window that produced it lights up in the model.
A human vouches for every figure that binds
Derived numbers start unlocked. You review, lock, and only then can a quote issue. Nothing binding leaves the building without a person behind it.
The change order is computed, not argued
The client approved a number. The plan changed. Brick diffs the model against the approved baseline and prices exactly what moved, with a running contract-sum ledger.
Clients walk the model before they sign
Every quote link carries a 3D walkthrough. Levels, wall cutaways, first person. Look, never touch.
Agents draw, you decide
A copilot and a full API can build rooms, cut openings, and draft quotes. Locking and issuing stay human, by construction.