What is an EPC Contractor and What Data Must They Deliver?

An EPC contractor (Engineering, Procurement and Construction) is the party responsible for delivering a capital project end-to-end — engineering design, sourcing of equipment and materials, and construction — typically under a single contract with the owner-operator. Alongside the physical facility, the EPC contractor is contractually responsible for delivering the engineering documentation, tag data, and vendor information the owner needs to operate and maintain it.

The EPC contractor's responsibility for data delivery at handover

Data and document handover is one of the most commonly underestimated obligations in an EPC contract. It is easy to focus contractual attention on schedule and construction milestones and treat data handover as an administrative afterthought — until the owner-operator discovers, months after start-up, that the document handover package is incomplete or inconsistent with the as-built facility.

Owner-operators are increasingly specifying structured, standards-based handover requirements rather than accepting a folder of PDFs at project close-out — see CFIHOS and ISO 15926. This means an EPC contractor needs a system for controlling documents and tag data throughout the project, not just a scramble to assemble one at the end of it.

Common data requirements from owner-operators to EPC contractors

• A complete, validated Master Tag Register covering every tagged item in the facility
• A structured document handover package including as-built drawings, vendor data, and certificates
• Validated supplier data tied to the correct tag for every piece of purchased equipment
• A clear change control trail showing what changed between design intent and as-built condition, and why

Why this matters more on multi-contractor projects

Large capital projects rarely involve a single EPC contractor working in isolation — multiple engineering disciplines, sub-contractors, and vendors all generate tag and document data that ultimately needs to be consolidated into one coherent register. Without a shared platform and a common tag numbering convention across all parties, this consolidation becomes a manual, error-prone exercise late in the project when there is the least schedule slack to fix it.

EPC vs. EPCM

EPC contractors carry full delivery risk and typically hold the construction contract directly, taking on responsibility (and liability) for cost and schedule overruns. EPCM (Engineering, Procurement and Construction Management) contractors instead manage the process on the owner's behalf, coordinating design, procurement, and construction without directly holding construction risk themselves. Data and document handover obligations apply under both models, though the contractual party formally responsible for delivering them differs.

How Sharecat supports EPC contractors

Sharecat is used across the full project ecosystem — by owners, EPC contractors, technology licensors, and suppliers on the same platform — so that tag, document, and supplier data stays consistent and controlled from FEED through to handover, rather than being reconciled for the first time at project close-out. This reflects Sharecat's role as the industrial document and data platform for engineering, project, asset, supplier, and product information across oil & gas, chemicals, utilities, pharmaceutical, shipping, and mining & metals projects.

Frequently asked questions about EPC contractors

Does the EPC contractor own the data after handover? No — contractually, data ownership typically transfers to the owner-operator at handover, which is exactly why the completeness and structure of that data at the point of transfer matters so much.

What happens if handover data is incomplete? The owner-operator inherits the cost of reconstructing missing information after start-up — often at significantly higher cost than it would have taken to capture correctly during the project.