Estimating data is one of the most valuable assets a contractor owns. Your takeoffs, assemblies, and historical costs reflect years of experience and hard-earned market knowledge. When that data lives in third-party software or disconnected files, you risk losing access and control. 

Many contractors have experienced this firsthand. A third-party estimator delivers solid work using their own tools, but once the engagement ends, the contractor is left with static files that can’t be easily reused. The value of the work stops the moment the bid is submitted. 

Consistent structure and documented assumptions don’t just make estimates easier to review. They improve accuracy over time, reduce rework, and give teams confidence that each new bid is building on proven data, not starting from scratch. 

STACK helps protect your data by keeping everything centralized under your ownership. Project history stays intact regardless of who performed the estimate. Role-based access lets you control exactly what a third-party estimator can view or edit. And when the engagement ends, the transition is clean. No missing files, no data recovery efforts, and no dependence on outside vendors.