A Practical Quantity Surveying Guide for Specialty Subcontractors

Specialty subcontractors face a unique estimating challenge: thin margins mean even small quantity errors can erase profit entirely. Here's a practical approach to tightening your process.

Start with a scope checklist

Before measuring anything, confirm exactly what's included in your scope of work against the specifications — not just the drawings.

Measure in the trade's natural units

Framing in linear and board feet, drywall in square footage by board type, concrete in cubic yards by mix design — matching natural units reduces conversion errors.

Reconcile against historical productivity

Compare quantities against your own historical crew productivity rates to sanity-check both the takeoff and the resulting labor estimate.