Meaning
Contracting agreements where a single contractor executes the complete design, procurement, and construction of a facility for a fixed, pre-determined price represent the most common method for securing budget certainty in major industrial projects. In a lump sum turnkey arrangement, the contractor carries the entire execution risk, from initial engineering through to successful commissioning and handover. The owner’s primary obligation is to pay the agreed price upon the completion of specified milestones.
This model transfers the risk of material inflation, labor disputes, and design errors away from the project sponsor.
Pricing Mechanism
Price adjustment under this model is restricted to cases where the owner initiates formal changes to the project’s original scope. In a lump sum turnkey contract, the baseline cost remains fixed regardless of the actual expenses incurred by the contractor during execution. This structure incentivizes the builder to optimize material procurement and construction productivity to preserve their profit margin.
However, it also means the owner cannot access any cost savings achieved by the contractor during the execution phase.
Performance Guarantee
Plant output and efficiency must meet the specified functional criteria before the asset is accepted by the owner. The lump sum turnkey contractor provides performance guarantees that are tested during the commissioning phase, demonstrating that the plant can operate at its rated capacity. If the facility fails to meet these metrics, the contractor must execute remediation work at their own expense.
Failure to resolve these issues triggers liquidated damages, protecting the owner’s investment case.
Project Delivery
Operational readiness is established when the contractor hands over the keys of a fully functioning facility. The lump sum turnkey term refers to this seamless transition from construction to operations.
