AI Takeoff

Why it matters in construction

Quantity takeoff can take days on a 150-sheet set for a mid-size commercial job. When an addendum arrives a week before bid day, part of that work has to be redone. The math is simple, but the volume can keep a senior estimator from sub coverage, scope review, and pricing strategy.

AI takeoff can shift the work from producing quantities to checking them. The model makes a first pass across the set. The estimator reviews each sheet and corrects misread symbols and missed details.

How it works

1. Sheet classification. The model reads title blocks and sheet content, sorts the set into architectural, structural, MEP, and civil, and links plan sheets to their details and schedules.
2. Element detection. Computer vision picks out walls, doors, windows, fixtures, structural members, and finishes on each sheet and uses the drawing scale to convert pixels into linear feet, square feet, or counts.
3. Schedule and spec cross-reference. The model reads door and finish schedules and the relevant spec sections as text, so a detected door gets its type, rating, and hardware set instead of just a tick mark.
4. Quantity roll-up. Detected elements get grouped by CSI division and assembly so the output looks like an estimator’s takeoff sheet, not a list of bounding boxes.
5. Review. Each quantity links back to the highlighted regions on the sheet. The estimator confirms, corrects, or rejects each item, and the corrections feed the next pass.

Each quantity should link back to the drawing. The estimator needs to see the marked-up source before using a number in a bid.

Example in practice

Consider a commercial GC pricing a 40,000 sq ft medical office building. The architectural set is 62 sheets with three addenda pending. By hand, one estimator spends roughly two and a half days on the takeoff for Divisions 08 and 09 alone.

The AI processes the set, counts 214 doors, flags 18 as rated assemblies based on the door schedule, and calculates 96,000 sq ft of gypsum board across partition types. The estimator reviews the output, catches that the model double-counted a repeated typical patient-room detail, and adjusts the drywall figure down by 3 percent. When Addendum 2 revises the second-floor layout, the estimator reruns the affected sheets instead of retracing the full set.