AF Form 1178B: FY Project Cost Estimate Worksheet (2026)

AF Form 1178B: FY Project Cost Estimate Worksheet (2026) – is a key U.S. Air Force form used in military construction and facility project planning. It provides a structured breakdown of detailed costs for Air Force projects, supporting accurate budgeting and funding requests.

What Is AF Form 1178B?

AF Form 1178B, officially titled FY Project Cost Estimate Worksheet – Detail Cost Estimate, is an official Air Force Information Management Tool (IMT) form dated May 1, 2000 (AF IMT 1178B, 20000501, V1). Previous editions are obsolete.

It serves as the detailed backup to the higher-level AF Form 1178 (FY Project Cost Estimate Summary) and works alongside AF Form 1178A (Building Description). Project managers, engineers, and cost estimators use these forms together during the planning and programming phases of military construction (MILCON) projects to justify costs in DD Form 1391 submissions or internal Air Force budgeting processes.

The form focuses on breaking down costs in thousands of dollars ($000) for primary facilities (using the UNIFORMAT II building systems classification) and supporting facilities (utilities, pavements, site work, etc.). It calculates subtotals, adds contingency, and arrives at the total project request.

Purpose of AF Form 1178B

The primary purpose is to create a transparent, itemized detailed cost estimate for Air Force construction or facility projects. This ensures:

  • Compliance with Air Force and DoD cost estimating standards.
  • Support for budget justification to Congress or higher headquarters.
  • Better risk management through contingency allowances and clear breakdowns.
  • Consistency across Major Commands (MAJCOMs), bases, and installations.

It is typically used in the Project Definition (PD) or early design stages, often as part of the Air Force’s project management process outlined in guides like the United States Air Force Project Managers’ Guide.

Note: While the form itself dates to 2000, it remains referenced in current Air Force project management resources and is available through official e-Publishing channels.

Key Sections and Structure of AF Form 1178B

The one-page form includes numbered blocks for project identification and detailed cost elements:

Header / Project Identification Blocks:

    1. PDC NUMBER (Project Data Code or similar identifier)
    1. PROJECT TITLE
    1. DATE
    1. MAJCOM
    1. BASE/STATE/INST CODE
    1. ACF (possibly Appropriation Code or similar)
    1. CONST START (Construction start date)
    1. MONTHS OF CONST
    1. PG DATE (Programming or Parametric Guide date)
    1. CURRENT PA (Project Authorization or similar)
    1. EXCHANGE (Exchange rate, if overseas)

Cost Breakdown Sections:

  • 12. PRIMARY FACILITIES — Broken down by Building UNIFORMAT System categories, including:
    • Substructure
    • Superstructure
    • Roofing
    • Exterior Closure
    • Interior Construction
    • Interior Finishes
    • Specialties
    • Plumbing
    • H.V.A.C. (Heating, Ventilation, Air Conditioning)
    • Special Mechanical
    • Electrical
    • Special Electrical
    • Equipment
    • Conveying Systems
  • 13. CAT CODE (Category Code)
  • 14. SCOPE (Description of scope)
  • 15. EQUP DOLLAR, OTHER APPN (Equipment dollars from other appropriations)
  • 17. SUPPORTING FACILITIES (in $000) — Detailed line items for:
    • Electric: O/H Line, U/G Line, Substation, Emergency Generator, Other
    • Other Utilities: Water System, Sanitary Sewer, Storm Sewer, Steam Line, Gas Line
    • Pavements: Road, Parking, Sidewalk
    • Site Improvements: Fence, Clearing/Landscaping, Sprinkler
    • Other Construction: Communications, Demolition, etc.

Summary and Total Blocks:

    1. BUILDING TOTAL
    1. SUPPORTING FACILITY TOTAL
    1. PRIMARY + SUPPORT TOTAL
    1. CONTINGENCY
    1. TOTAL CONTRACT COST
    1. SIOH (Supervision, Inspection, and Overhead — or similar)
    1. TOTAL REQUEST
    1. TOTAL REQUEST ROUNDED

All costs are entered in thousands of dollars. The form flows logically from detailed line items to rolled-up totals, making it easy to trace how the final request is derived.

How to Use AF Form 1178B (Step-by-Step Guidance)?

  1. Gather Project Data — Start with the project scope, site conditions, building requirements (often from AF Form 1178A), and parametric cost data or historical bids.
  2. Fill Identification Blocks — Enter accurate project identifiers, MAJCOM, base, and scheduling information.
  3. Detail Primary Facilities — Use UNIFORMAT II to assign costs to each building system element. Draw from cost databases, engineer estimates, or contractor quotes.
  4. Detail Supporting Facilities — Itemize utilities, pavements, and site work separately. These are often significant in military projects due to unique base infrastructure needs.
  5. Calculate Subtotals and Add Contingency — Sum primary + supporting facilities, then apply an appropriate contingency percentage based on project maturity and risk (common DoD practice).
  6. Add SIOH and Finalize Totals — Include supervision/inspection/overhead costs, then compute the total request. Round as needed for presentation.
  7. Cross-Reference with AF Form 1178 — The detailed numbers from 1178B typically feed into the summary form (1178) for higher-level review.

Best Practices:

  • Use current cost indices and location factors (CONUS or OCONUS).
  • Document assumptions clearly (often attached separately).
  • Coordinate with civil engineers, financial managers, and MAJCOM staff.
  • Ensure alignment with DoD cost estimating guidelines and Air Force financial management instructions (e.g., elements of AFI 65-601 series on budget guidance).

Who Uses AF Form 1178B?

  • Air Force Civil Engineer Squadrons and Project Managers
  • MAJCOM staff (e.g., A4 directorates)
  • Cost estimators and programmers
  • Personnel preparing DD Form 1391 (Military Construction Project Data) justifications

It is especially critical for MILCON projects, facility sustainment, restoration, and modernization (SRM) initiatives.

Download the Official AF Form 1178B

You can download the current official blank PDF directly from the Air Force e-Publishing site:

→ Download AF Form 1178B PDF

Always use the version from e-Publishing.af.mil for official use. Do not rely on unofficial copies for submissions.

  • AF Form 1178 — Project Cost Estimate Summary
  • AF Form 1178A — Project Cost Estimate Worksheet – Building Description
  • DD Form 1391 — Military Construction Project Data (often supported by these worksheets)

For broader guidance on Air Force project cost estimating, refer to official resources such as the Air Force Project Managers’ Guide and DoD Cost Estimating Guide.

Tips for Accurate Air Force Cost Estimating

  • Base estimates on reliable data sources (historical Air Force projects, RSMeans, or parametric tools).
  • Account for escalation, location adjustments, and unique military requirements (force protection, AT/FP standards, etc.).
  • Include thorough documentation to withstand audit or Congressional scrutiny.
  • Update estimates as the project moves through design phases.

Important: This article provides general information based on publicly available official sources. For official policy, procedures, or training on using AF Form 1178B, consult your local Civil Engineer squadron, MAJCOM guidance, or the latest Air Force instructions on financial management and construction programming.

If you need help understanding specific blocks, preparing a sample estimate, or related MILCON processes, feel free to provide more details about your project.

Keywords: AF Form 1178B, Air Force project cost estimate, detail cost estimate worksheet, MILCON cost estimating, AF IMT 1178B, military construction budgeting, UNIFORMAT cost breakdown.