Traditionally, R&A projects have used the work-item basis because it allows the removal
or addition of project scope to meet budgetary limitations and allowances. GSA assigns
alphabetical codes to the work items when describing the project and its costs for each R&A
prospectus, as required by the Office of Management and Budget (OMB) and Congress.
See Chapter 2 for further description of non-prospectus projects.
GSA may require that estimates be formatted in additional ways. For instance, it may be
necessary to subdivide estimates for individual buildings and other components into new
construction and major renovation.
Work items on non-prospectus projects frequently evolve from Building Evaluation Reports
(BERs), and estimates for these projects may follow a Work Breakdown Structure (WBS).
Situations that might require a WBS include:
Differing financial commitments of multiple tenants of a project, requiring separate
contracts for each tenant's work.
The need for separate contracts for buildings and their site work, such as at border
Phased renovation projects requiring swing space for a variety of tenants or
Projects to be funded over more than one year.
Separation of a project into base-contract work and options or alternates.
Projects below 0,000 may be executed under line-item or job-order contracts, for which
cost estimates are derived from line-item databases. Cost proposals for the services of the
A-E's estimator and the independent government estimator must be submitted to GSA on
Form 2630/2631, shown in Appendix E.
general requirements and principles