Previous articles in this series examined contract models built around clearly defined scope and predictable pricing. In practice, however, not every project begins with that level of certainty. When timelines are compressed or design information is still evolving, a different approach is required. The cost-plus contract (CCDC 3) is designed for these conditions, allowing construction to move forward while details are still being finalized.
Under CCDC 3, the contractor is reimbursed for the actual cost of the work, along with an agreed-upon fee to cover overhead and profit. This fee may be structured as a percentage of costs, a fixed amount, or a combination of both. Unlike stipulated price contracts, where the total cost is established upfront, the final project cost under a cost-plus model is determined as the work progresses.
This structure makes CCDC 3 particularly useful when design is incomplete at the time of contract award. Rather than delaying construction until every detail is finalized, owners can proceed with early phases while continuing to refine drawings and specifications. This can be critical for projects facing schedule pressures or complex site conditions that are difficult to fully define in advance.
Because pricing is based on actual costs, transparency becomes a central feature of the contract. Contractors are typically required to maintain detailed, auditable records of labour, materials, equipment, and subcontractor expenses. This level of visibility allows owners to monitor spending in real time and provides assurance that costs are being managed appropriately.
At the same time, the flexibility of CCDC 3 introduces a different risk profile. Without a fixed price, the owner assumes a greater share of cost uncertainty. To manage this, many projects incorporate a guaranteed maximum price (GMP), which establishes an upper limit on total cost while still preserving the adaptability of the cost-plus structure. Additional mechanisms, such as shared savings incentives, may also be used to align contractor performance with budget objectives.
Another key distinction lies in procurement. Since final pricing cannot be fully determined at the outset, contractor selection often places greater emphasis on experience, capability, and approach, rather than lowest bid alone. This can support better outcomes on complex or fast-tracked projects, where collaboration and problem-solving are essential.
CCDC 3 is often contrasted with more traditional models because it allows construction and design to overlap. This can reduce overall project duration, but it also requires careful coordination between the owner, consultant, and contractor to ensure decisions are made efficiently as the project evolves. Strong communication and clearly defined processes are essential to prevent scope creep and maintain control over both schedule and cost.
CCDC 3 addresses uncertainty at the individual project level, making it a practical option when conditions do not allow for a fully defined scope at tender. As this series continues, the next article will examine CCDC 4, the unit price contract, which introduces a different form of flexibility by fixing unit rates while allowing total quantities – and overall cost – to vary.
Looking for a team to take the lead on your next project? At Pulse Construction, we’re committed to doing business with an honest, professional, and competitive approach – without compromising safety or schedules. Contact us today for all of your building needs.
