Cost Estimation and Bidding

Contractors working in the District of Columbia face a dual compliance burden that contractors in purely private markets do not: every bid submitted on a public project must satisfy both DC Office of Contracting and Procurement rules and, where federal funding is involved, the Federal Acquisition Regulation. A miscalibrated estimate does not just lose a job — it can trigger a bid rejection, a defective pricing determination, or a cost recovery action that claws back profit months after project completion.

What a Compliant Cost Estimate Actually Contains

A construction cost estimate is not a ballpark figure rounded to the nearest ten thousand dollars. Under FAR Part 36, a government construction estimate must be prepared independently by the contracting agency before solicitation, and that figure becomes the benchmark against which all submitted bids are evaluated. Contractors need to understand this because a bid that exceeds the government's estimate by more than 25% can be used to justify cancellation of the procurement entirely (according to FAR 36.205).

A structurally sound estimate breaks into five layers:

1. Direct costs — labor, materials, equipment, and subcontractor costs tied directly to scope items
2. Indirect costs — field overhead, site supervision, temporary facilities, and utilities
3. General and administrative costs — home office overhead allocated to the project
4. Profit — a separately stated line, not buried in overhead
5. Contingency — a risk-adjusted reserve, not a padding line

The GAO Cost Estimating and Assessment Guide identifies four characteristics of a high-quality estimate: well-documented, comprehensive, accurate, and credible. A credible estimate includes sensitivity analysis — testing how the total changes when key unit costs shift by 10% or 20%.

Labor and Material Pricing in DC

DC wages on public projects are governed by the Davis-Bacon Act, which sets prevailing wage floors by trade classification. The U.S. Department of Labor publishes wage determinations specific to the Washington-Arlington-Alexandria metropolitan area. Failing to incorporate the correct wage determination into a bid — not a close approximation, the exact published rate — is a defective pricing error that surfaces at audit.

Material pricing requires sourcing from current suppliers, not historical invoices. Steel, concrete, and mechanical equipment pricing can shift 15–30% between design completion and bid date on projects with long pre-solicitation timelines. The National Institute of Building Sciences recommends that estimators index material costs to recognized price indices such as the Engineering News-Record Construction Cost Index and document the index date used in the estimate workbook.

The Role of Life-Cycle Costing

On federally funded DC projects — particularly those involving building systems, HVAC, and envelope assemblies — 10 CFR § 433.8 requires life-cycle cost analysis for energy-related design decisions. This is not optional language. A contractor proposing a value engineering substitution on a mechanical system must be prepared to show that the substituted system does not increase life-cycle cost to the federal government over the facility's service life.

The U.S. Army Corps of Engineers Cost Engineering program publishes the Construction Cost Estimating Guide (EP 1110-1-8) and maintains the MCACES Second Generation (MII) estimating software used on Corps-administered projects in the National Capital Region. Contractors bidding USACE work in DC who do not understand MII's cost breakdown structure will submit proposals that cannot be directly compared to the government estimate.

DC-Specific Procurement Rules

The DC Office of Contracting and Procurement operates under the DC Procurement Practices Reform Act of 2010. Under that framework, competitive sealed bidding applies to construction contracts valued above $100,000. The OCP requires that bids be submitted on the forms provided in the Invitation for Bids — substituting a proprietary format is grounds for rejection.

DC's Small Business Enterprise (SBE) and Certified Business Enterprise (CBE) requirements add a subcontracting cost layer. On contracts above $250,000 with the District, prime contractors must submit a subcontracting plan, and failure to meet CBE participation targets can result in liquidated damages (according to DC OCP). These subcontracting commitments have real cost implications that must be modeled in the bid at the proposal stage, not retrofitted after award.

Proposal Preparation Under FAR Part 15

When a DC project involves a negotiated federal contract rather than sealed bidding, FAR Part 15 governs proposal preparation. The Truthful Cost or Pricing Data statute (formerly the Truth in Negotiations Act) requires that contractors certify the accuracy, completeness, and currency of cost or pricing data submitted in support of proposals exceeding the threshold — set at $2 million as of the National Defense Authorization Act adjustments tracked in the eCFR Title 48.

A defective pricing finding under FAR 15.407-1 allows the government to reduce the contract price by the amount of any overstatement, plus interest. The risk is not hypothetical — the Defense Contract Audit Agency routinely audits cost proposals on negotiated construction contracts in the DC area.

OSHA Compliance Costs as a Bid Line Item

OSHA Construction Standards compliance is not a background assumption — it is a direct project cost. Personal protective equipment, fall protection systems, confined space monitoring equipment, and safety personnel salaries are quantifiable. On high-rise or excavation-heavy DC projects, safety program costs can represent 2–4% of total direct costs. Omitting this line from the estimate and absorbing it into overhead produces margin erosion that compounds across project phases.

FAQ

What is the difference between a bid bond and a performance bond in DC procurement?

A bid bond guarantees that a contractor will enter into a contract if awarded; a performance bond guarantees completion of the work. DC OCP requires bid bonds for construction contracts above $100,000 at 5% of the bid amount, and performance bonds at 100% of the contract value (according to DC OCP).

How does FAR Part 36 affect the bid evaluation process?

Under FAR Part 36, the contracting officer compares all responsive bids to the independent government estimate. Bids more than 25% above the estimate trigger a price reasonableness analysis and may result in re-solicitation.

What records must a DC contractor retain to support a cost estimate?

Supporting documentation — supplier quotes, wage determinations, equipment rental rates, subcontractor proposals — must be retained for a minimum of 3 years after final payment on federally funded contracts (according to FAR 4.703).

References

• eCFR Title 48 — Federal Acquisition Regulations System
• FAR Part 15 — Contracting by Negotiation
• FAR Part 36 — Construction and Architect-Engineer Contracts
• U.S. Army Corps of Engineers Cost Engineering
• DC Office of Contracting and Procurement
• OSHA Construction Standards
• eCFR 10 CFR § 433.8 — Life-Cycle Costing
• GAO Cost Estimating and Assessment Guide
• National Institute of Building Sciences

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)