Structured Data Extraction

Why it matters in construction

Almost everything a precon team receives is unstructured. Sub proposals arrive as PDFs and email bodies. RFPs are 80-page documents with the bid date buried on page 14. Specs are prose. The data an estimator or BD lead needs, the price, the exclusions, the due date, the required bonding, is in there, but someone has to read it and rekey it into a spreadsheet or a CRM.

That rekeying takes hours and introduces errors. Structured data extraction does the first read and produces fields a computer can use, shifting human time from typing to verification.

How it works

1. Define the target schema. You tell the model what fields you want. For a sub proposal that might be scope item, quantity, unit, unit price, total, inclusions, exclusions, alternates, and validity period. For an RFP it might be owner, delivery method, bid due date, bonding requirement, and prequalification deadline.
2. Feed the document. The PDF text (or, for scans, the OCR output) goes to a language model with the schema and instructions to fill it from the document only.
3. Get typed output. The model returns JSON or a table. Numbers come back as numbers, dates as dates, and lists as lists, so the result can be loaded into a leveling sheet or a pipeline record.
4. Keep provenance. Each field carries a pointer to the page and passage it came from. That makes the output reviewable.
5. Validate. Simple checks catch the obvious problems: totals that do not sum, dates in the past, a unit price ten times the norm for that trade.

The model can identify the same fields across different proposal formats. A sub’s homegrown format may need review, but it does not require a separate template by default.

Example in practice

In a hypothetical scenario, a commercial GC gets an ITB for a 120,000 sq ft distribution center. Precon runs the 90-page RFP through extraction and gets a pipeline record with the bid date, a mandatory pre-bid walk on the 9th, a 10 percent bid bond requirement, and a note that the owner requires a WBE participation plan. The WBE requirement appears on page 61, where it is easy to miss in a manual review.

On bid day, the same extraction runs on 14 electrical proposals. Twelve come out clean. Two get flagged because the model could not find a total that matched the line items, and on review one sub had left out their own lighting controls line. The estimator calls them before award instead of after.