P-120 Project Estimating Requirements for the Public Buildings Service  

Change / Revision Date: 

This cost-estimating and cost-management criteria document supports building construction
programs within the Public Buildings Service (PBS) of the U.S. General Services Administration
(GSA). This document presents the technical and administrative requirements for routine
cost estimating and cost-management tasks involved in a construction project’s planning and
execution stages, and defines cost-estimating practices and standards for professional services.
This document replaces the previously issued GSA Handbook P 3440.5 and all associated versions.

The instructions and criteria in this document are applicable to programming, design, construction
management, and other professional-services contracts that involve cost-estimating and
cost-management tasks. The criteria for practices and documentation requirements apply to all
professional services activities, whether provided through contract or by in-house GSA/PBS staff.

The cost-estimating tasks addressed in this document must establish accurate project costs,
ensure that they are based on programming requirements, keep costs within authorized limits,
and collect GSA cost data to refine business practices and future cost estimates.

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