Public sector constraints and policies

A private developer can choose almost any delivery method it likes, negotiate with any builder it trusts, and change its mind halfway through. A public owner cannot. Public agencies spend taxpayers' money, so they must follow statutes, regulations, trade agreements and internal policies that set how they may select designers and builders, which delivery methods they may use, how they must justify their choice, and how they must document and report it. Those rules strongly shape which delivery methods appear on public projects in each country and each province or state. This lesson explains the main constraints and how they affect the choice and structure of a delivery method. The detailed procurement rules on thresholds, domestic content and social procurement are in CON-330 lesson 10, and tendering law is in CON-220 lesson 3.

Legal authority to use a method

In the United States, public owners can use only the delivery methods that their governing statutes allow. Many state and local procurement codes historically required design-bid-build with award to the lowest responsible bidder. Design-build, CMAR, CM/GC and P3s have each required specific enabling legislation, state by state and sometimes owner type by owner type. The Design-Build Institute of America tracks design-build authority and reports that most states now authorize it for at least some public owners, and the Federal Highway Administration counted 40 states plus the District of Columbia and Puerto Rico with transportation P3 statutes as of October 2025. Federal agencies may use design-build under FAR Subpart 36.3, and federal-aid highway projects using design-build must follow 23 CFR Part 636.

Selecting designers

Delivery method choice and designer selection are linked. In design-bid-build and construction management the owner hires the designer directly; in design-build the design-builder does. Public owners often must select designers by qualifications rather than price, because the quality of design affects the whole life cost of the asset far more than the design fee does.

In the United States, the federal Brooks Act of 1972 requires federal agencies to select architects and engineers on demonstrated competence and qualifications, then negotiate a fair and reasonable fee with the top-ranked firm, moving to the next firm only if negotiations fail. Many states have adopted similar laws for state and local agencies, and federal-aid highway and transit projects generally require qualifications-based selection for engineering services.

# Qualifications-based selection: rank firms, then negotiate fee with the top-ranked firm (illustrative)
firms = {   # firm: (experience, team, approach, past performance) each out of 25
    "Firm A": (22, 20, 21, 23), "Firm B": (19, 23, 22, 20), "Firm C": (24, 18, 19, 22),
}
ranking = sorted(firms, key=lambda f: sum(firms[f]), reverse=True)
for f in ranking:
    print(f"{f}: {sum(firms[f])}/100")
owner_estimate = 2_400_000          # owner's independent fee estimate
proposed = {"Firm A": 2_650_000, "Firm B": 2_380_000, "Firm C": 2_900_000}
tolerance = 0.08                    # owner policy: agree if within 8 % of its estimate after negotiation
for f in ranking:
    negotiated = proposed[f] * 0.95     # assume negotiation removes about 5 %
    ok = negotiated <= owner_estimate * (1 + tolerance)
    print(f"Negotiate with {f}: proposed {proposed[f]:,}, after negotiation {negotiated:,.0f} -> {'agree' if ok else 'end, go to next firm'}")
    if ok:
        break

Firm A: 86/100
Firm B: 84/100
Firm C: 83/100
Negotiate with Firm A: proposed 2,650,000, after negotiation 2,517,500 -> agree

Justifying the delivery method

Public owners increasingly must show why they chose a delivery method, especially for large projects and for P3s. A typical justification includes the project's objectives and constraints, the methods considered, a qualitative comparison against criteria such as schedule, cost certainty, risk transfer, market interest and owner capacity, and for P3s a quantitative value-for-money analysis. Many owners use a two-step screen: a qualitative workshop to shortlist methods, then a quantitative analysis of the shortlist.

# Delivery model screening rules of the kind used by US public owners (illustrative only)
def screen(capital_cost_m, complexity, long_term_maintenance, revenue_source, statute_allows_p3):
    notes = []
    if statute_allows_p3 and capital_cost_m >= 100 and (long_term_maintenance or revenue_source):
        notes.append("assess a P3 option with value-for-money; check TIFIA and private activity bond eligibility")
    if complexity == "high":
        notes.append("consider CM/GC or progressive design-build if authorized")
    if capital_cost_m < 50 and complexity == "low":
        notes.append("design-bid-build or design-build likely efficient")
    return notes or ["compare CMAR and design-build, subject to statutory authority"]
for proj in [("Regional hospital", 1200, "high", True, False, False), ("Managed toll lanes", 900, "high", True, True, True),
             ("Fire station", 18, "low", False, False, False), ("Water plant with user fees", 320, "high", True, True, True)]:
    print(proj[0] + ":", "; ".join(screen(*proj[1:])))

Regional hospital: consider CM/GC or progressive design-build if authorized
Managed toll lanes: assess a P3 option with value-for-money; check TIFIA and private activity bond eligibility; consider CM/GC or progressive design-build if authorized
Fire station: design-bid-build or design-build likely efficient
Water plant with user fees: assess a P3 option with value-for-money; check TIFIA and private activity bond eligibility; consider CM/GC or progressive design-build if authorized

Screens like this are aids, not rules. Their value is in forcing a consistent set of questions so that delivery choices are not made by habit or by whoever argues loudest. Lesson 11 develops a fuller scoring method.

Fairness, transparency and accountability

Every public delivery method must satisfy the same core principles: open and fair competition, equal treatment of bidders, transparency of criteria, protection of confidential information, avoidance of conflicts of interest, and records that support audit. Alternative methods put more strain on those principles because they involve judgment, negotiation and early collaboration.

US public owners often use independent cost estimators, procurement officers separated from technical evaluators, and protest procedures that let unsuccessful bidders challenge awards. Public records laws apply to agency records, subject to trade secret protections. Bid rigging is prosecuted as a criminal violation of section 1 of the Sherman Act, and the Department of Justice's Procurement Collusion Strike Force focuses on public procurement.

Funding conditions

Much public construction is funded at least partly by another level of government, and the funding brings conditions. Grant agreements may require particular procurement rules, domestic content, labor standards, environmental reviews, Indigenous consultation, accessibility, climate resilience assessments or reporting. Delivery method choice must fit those conditions: a funding program that pays only for construction costs incurred after an agreement date may not reimburse a progressive development phase; a program that requires competitive low-bid procurement may not allow a negotiated GMP.

Federally funded transportation projects in the United States must follow federal procurement rules, such as 23 CFR Part 636 for design-build and Buy America requirements, Davis-Bacon prevailing wages and disadvantaged business enterprise programs (CON-330 lesson 10). Federal grants under other programs follow the Uniform Guidance in 2 CFR Part 200. Because surface transportation authorizations under the Infrastructure Investment and Jobs Act expired on 30 September 2026, with a short-term extension in progress in August 2026, owners planning federally funded projects should confirm which program rules and funding levels apply.

Labor and community policies

Public owners increasingly attach labor and community requirements to major projects. Some use project labor agreements, which set terms with building trades unions for the whole project; others require community benefits agreements or community employment plans for local hiring, apprenticeships, Indigenous participation and social procurement. These requirements interact with delivery method. In a P3 or design-build, the owner must write them into the project agreement so that the consortium prices and delivers them; in construction management, the construction manager carries them into every trade package.

In the United States, federal policy on project labor agreements has changed between administrations; check current requirements for federal projects. Many states and cities set their own policies, and some prohibit requiring project labor agreements on public work. Prevailing wage laws at federal and state levels apply regardless of delivery method.

Reporting and audit after award

Public accountability does not end when the contract is signed. Auditors general, inspectors general, councils and boards review how major projects were delivered, and their reports often focus on the delivery choice itself: whether the business case was sound, whether risks transferred were really transferred, whether change orders and claims eroded the expected benefit, and whether lessons were applied to later projects. Owners that keep clean records of their delivery decisions and track outcomes against the original rationale fare much better in these reviews.

For contractors, the practical consequence is that public owners will expect open, well-organized records on any method with negotiated pricing or shared savings, because those records may end up in an audit report.