Question 2 of 6: Contract administration — project environment and risk under three delivery approaches

Question 2: Contract administration — project environment and risk under three delivery approaches (20 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

A delivery method is a decision about where information, control and risk sit, not merely a form of words. Each of the three approaches named in this question places the design, the price and the schedule in a different set of hands, and each is therefore suited to a project environment with a particular combination of design maturity, owner capability, urgency and third-party exposure. In Canadian practice these choices are made against the standard-form families published by the Canadian Construction Documents Committee — CCDC 2 for stipulated-price work, CCDC 14 for design-build — and against provincial procurement rules that constrain how public owners may evaluate and award.

Design-Bid-Build. The owner retains a consulting engineer or architect, takes the design to a complete and coordinated set of drawings and specifications, and only then puts the work out to competitive tender; the low compliant bidder is awarded a fixed lump sum. This suits an environment in which the scope can genuinely be defined before construction begins, where the owner has the time to run design and tender sequentially, where public accountability demands a transparent low-bid award, and where the technology is conventional enough that a contractor can price it accurately from documents. Municipal water mains, school buildings, bridge rehabilitations and most publicly funded linear works fall into this category. The risk split follows directly from that sequence. The owner keeps design risk: because the owner supplies the drawings, the owner impliedly warrants that they are adequate for construction, and every error, omission, interference or late-arriving detail becomes a change order priced at the contractor's rates in a position of no competition. The owner also keeps differing-site-condition risk under the usual CCDC 2 clauses, and keeps schedule risk arising from its own consultant's response times. The contractor keeps means-and-methods risk, productivity risk, escalation risk within the fixed price, and the risk of having mis-estimated a quantity or a production rate. In aggregate the contractor's risk is the narrowest of the three approaches, which is why design-bid-build normally attracts the lowest bid margin — and also why owners are so often surprised by its final cost, since the low price buys only what the documents actually showed.

Turnkey. In a turnkey arrangement a single organisation takes responsibility for design, procurement, construction and commissioning, and hands the owner a functioning facility — the owner "turns the key." The owner's contribution is a performance specification: throughput, capacity, efficiency, availability, emissions, and the date. This suits an environment in which the owner can describe what the facility must do far more confidently than how it should be built — process plants, wastewater treatment works, power generation, industrial and mining facilities — and in which the contractor's proprietary process knowledge is itself part of the value being bought. It also suits owners with thin technical staff, and schedules tight enough that design and construction must overlap, since a single party can begin foundations while the process design is still maturing. The risk transfer is aggressive: the contractor accepts design risk, interface risk between design and construction, quantity risk, and typically performance risk backed by liquidated damages for failing to meet the guaranteed output, plus schedule risk backed by delay damages. The owner in exchange gives up detailed control over how the work is executed and loses the ability to price changes competitively; its remaining exposure is concentrated in the quality of its own performance specification, in scope changes it initiates, and in the counterparty risk of having placed so much on one contractor's balance sheet. That last point is the real limit of turnkey: risk transferred to an organisation that cannot absorb it is not transferred at all, which is why turnkey work is normally restricted to prequalified bidders backed by performance bonds and parent-company guarantees.

Lane rental. Lane rental is not a delivery model in the same sense but a payment mechanism layered onto a construction contract, developed for road and highway work. The contractor is charged a daily or hourly rent for each lane, shoulder or ramp it occupies, at a rate set to approximate the delay cost imposed on the travelling public; the rent is deducted from progress payments, and a contractor who returns lanes to traffic early keeps the saving. It suits an environment in which the road user cost of an occupied lane is large and quantifiable — urban freeways, high-volume arterials, bridge deck rehabilitation, resurfacing in dense corridors — and in which the work is repetitive enough that the contractor has genuine latitude to compress it by working nights, weekends or continuous shifts. It is unsuitable where the contractor has little control over closure duration, for example where utility relocations or third-party approvals govern. The risk profile is distinctive: the owner accepts the administrative burden of measuring and auditing occupancy, and accepts that bid prices will rise to cover the rent and the premium-time working it provokes, but it converts an unpriced public cost into a contractual incentive and largely removes its own exposure to prolonged disruption. The contractor accepts a genuinely new commercial risk — every hour of lost production now has a direct cash cost on top of its own overhead — together with the safety and quality risks that come with compressed night work. Well-calibrated, lane rental is the most efficient of the three at aligning the contractor's cash interest with the public interest; badly calibrated, it simply inflates bids and pushes crews into unsafe schedules.

Comparing the three, the owner's risk is highest under design-bid-build and lowest under turnkey, while the contractor's is the reverse; lane rental sits alongside either and shifts a specific, well-defined slice of time risk onto the contractor. The decision rule that follows is simple to state and hard to apply: transfer a risk only to the party that can best foresee, control and absorb it, and expect to pay for every risk transferred.