Integrated Estimate Plan and Basis of Estimate: Improving Cost Estimate Accuracy in FEL

Aligning Estimate Planning and Documentation for Better Investment Decisions | ROMAN Consulting Group

Many capital projects move forward with complete documentation, yet still experience cost growth during execution. A common root cause is not poor estimating technique, but a lack of alignment between the Estimate Plan and the Basis of Estimate (BoE). When these are developed separately, inconsistencies in scope, assumptions, quantities, and methodology can go undetected until execution.

In Front-End Loading (FEL), where scope is evolving and inputs come from multiple disciplines, this disconnect is common. The Estimate Plan is often created early and set aside, while the BoE is written later to describe what was done rather than guide how the estimate was built. This timing gap creates a loss of traceability and weakens estimate credibility.

The Integrated Estimating Workflow for Class 3 and Class 4 cost estimates. One controlling reference from kickoff to validation.

Integrated Estimate Plan and BoE Framework: Combining AACE RP 36R-08 and RP 34R-05 into a single workflow that aligns scope, quantities, assumptions, methodology, and risk throughout estimate development.

An integrated approach improves estimate quality by:

• Aligning scope, quantities, assumptions, and cost methodology from the start

• Creating a single controlling reference instead of separate documents

• Making uncertainty visible and linking contingency to real risk drivers

• Ensuring consistency between engineering inputs and estimating outputs

• Strengthening reviews by focusing on alignment rather than checklist completion

When estimate planning and basis documentation evolve together, the estimate becomes a transparent and defensible system rather than a collection of disconnected documents.

At ROMAN Consulting Group, we help owners and project teams integrate estimate planning and Basis of Estimate development into a single, structured workflow. Our front-end support strengthens scope alignment, improves estimate transparency, and ensures that cost assumptions and risks are clearly understood before capital is committed.

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