EPC stands for Engineering, Procurement and Construction. It is a comprehensive project-delivery model in which one contractor is responsible for design, procurement, construction and delivery of an operational project. The source also describes EPC as a turnkey approach and notes its use in oil and gas, petrochemicals, energy, infrastructure and industrial projects.
The three EPC stages
- Engineering: preparation of conceptual, preliminary and detailed design, technical drawings, equipment specifications and related engineering documents; the source also references FEED as a possible front-end stage.
- Procurement: supplier selection, purchasing, transport, customs/logistics and inventory management to ensure equipment matches technical requirements and arrives on time.
- Construction: site execution and installation in accordance with the design, including site management, progress monitoring, quality control and required testing.
Key EPC characteristics
- Single-point responsibility: the EPC contractor manages the project from engineering through construction.
- Cost and schedule certainty: EPC contracts commonly establish defined time and cost obligations, shifting a significant part of delivery risk to the contractor.
- Turnkey handover: the contractor delivers the project ready for use according to the agreed scope.
Advantages of EPC
- Integrated management under one delivery entity reduces coordination between multiple contractors.
- Employer risk can be reduced because time and cost responsibility is concentrated with the EPC contractor.
- Overlapping and integrated activities can shorten overall delivery time.
- The contractor remains responsible for achieving the specified final quality.
Challenges of EPC
- High contractor responsibility: design, procurement or construction problems remain largely with the EPC contractor.
- Reduced employer control: the client generally has less day-to-day control over procurement and execution details.
- High capability requirement: successful EPC delivery requires strong engineering, procurement and construction management resources.
EPC compared with EPCM
In EPCM (Engineering, Procurement and Construction Management), the service provider designs, procures and manages construction but does not necessarily self-perform construction. Construction is typically carried out by separate contractors under the management structure. In EPC, responsibility is more consolidated within the EPC contractor.
Typical EPC applications
- Oil, gas, refinery and petrochemical projects.
- Power generation, renewable energy and transmission infrastructure.
- Urban infrastructure such as metro systems, bridges, dams and highways.
- Industrial plants and manufacturing complexes.
What is a PC contract?
PC stands for Procurement and Construction. It covers procurement and physical execution, while engineering/design has normally been completed by the employer or an independent consultant before the PC contractor begins work.
- Procurement: purchase and supply of materials and equipment based on the issued design.
- Construction: execution and installation according to the drawings and technical specifications.
EPC vs PC: the key differences
| Issue | EPC | PC |
|---|---|---|
| Engineering | Contractor is responsible for the complete design process. | Design is already prepared by the employer or consultant. |
| Contractor responsibility | Engineering, procurement and construction are integrated. | Responsibility is limited mainly to procurement and construction. |
| Time and cost | Contractor commonly assumes broader schedule and cost obligations. | Design is outside the contractor’s scope, so overall project certainty depends more on interfaces. |
| Employer involvement | Employer focuses more on requirements and overall oversight. | Employer/consultant retains more control because design remains on their side. |
Pros and cons of EPC
Advantages: integrated management, fewer coordination interfaces, lower employer exposure to some time/cost risks and turnkey delivery.
Disadvantages: less employer control over design/execution detail and high dependence on selecting a capable EPC contractor.
Pros and cons of PC
Advantages: greater employer control over design and suitability for projects whose design is already complete.
Disadvantages: possible coordination gaps between design and execution, with the PC contractor carrying less responsibility for overall project success.
Which model should an employer choose?
The choice depends on project maturity, risk appetite and the level of design control the employer wants to retain. EPC is more suitable when the employer seeks an integrated solution with broad contractor responsibility from design through handover. PC is more suitable when design is already complete and the employer wants to maintain direct control over it while appointing a contractor for procurement and construction.
Talk to ESPO
For healthcare design support or project-delivery advice, contact the ESPO team.
Technical note: This article is based on the supplied source material. Final dimensions, airflow pressure relationships, infection-control routes and other requirements should be checked against the latest project-specific codes and competent professional advice before implementation.
