Most bad bids are lost in the first hour, before anyone touches a calculator. The estimator skims the drawings, starts measuring, and never reads the front-end documents that define what is actually being bought.
Start with the specification’s Division 01. That is where the general conditions, allowances, unit prices, liquidated damages and submittal requirements live. A tight schedule with heavy liquidated damages changes your crew loading and therefore your labor cost, and none of that is visible on the floor plan.
Next, read every addendum in order and mark what each one changes. Addenda issued late in a bid cycle routinely move quantities by five to ten percent, and a takeoff done against the original set is worthless once the third addendum lands.
Then walk the drawings in this order
- Civil and site plans – what has to happen before the building starts
- Structural – the quantities that drive the biggest dollars
- Architectural plans, sections and details – where scope hides
- MEP – coordination conflicts and equipment schedules
- Schedules and legends – door, window, finish, fixture
Only after that pass should quantities start coming off. The half hour spent reading is the cheapest risk reduction available on any bid.