Foreign Subcontractors in Vietnam Construction Projects
For a main contractor or EPC contractor, using foreign subcontractors in Vietnam construction projects can bring specialist expertise and extra project capacity, but it also creates downstream risks that can return to the main contractor. The key management question is not simply whether work can be subcontracted. It is whether the subcontractor’s legal status, people, scope, documents, payment terms, performance, and dispute arrangements are controlled well enough to protect the main contract.
Foreign subcontractors in Vietnam construction projects create two levels of control. The subcontractor must be legally and operationally ready for its own scope, while the main contractor must keep the subcontract consistent with the main contract, project approvals, personnel requirements, acceptance records, payment structure, and warranty obligations. Problems at subcontract level can still return upstream through owner claims, project delay, incomplete records, or unrecovered cost.
A foreign subcontractor in Vietnam that directly performs regulated construction activities needs its own construction operation license for that scope. The main contractor’s license does not extend to the subcontractor. The project-specific question is whether the assigned subcontract scope falls within regulated construction activities, so that point should be checked before mobilization rather than inferred from the main contractor’s license or approval. The same discipline should continue through personnel mobilization, project records, payment, acceptance, defects, and final close-out.
A foreign subcontractor that directly performs regulated construction activities in Vietnam needs its own construction operation license in Vietnam for the scope it performs. The main contractor’s license does not extend to the subcontractor. The practical check is whether the assigned subcontract scope falls within regulated construction activities and therefore triggers the licensing requirement.
The practical risk is often a mismatch between the subcontract on paper and the work actually carried out on site. A specialist subcontractor may be brought in for installation, testing, commissioning, design support, or another technical package, while the project team assumes the main contractor’s approvals are enough.
A gap found late is rarely just a paperwork correction. The owner may raise it during acceptance or audit, use it as a reason to withhold payment, or keep it as an argument for a later claim, which is one of the ways a compliance issue turns into foreign EPC contractor payment risk in Vietnam.
The main contractor should therefore review the subcontractor as a separate project participant. The review should connect the entity named in the subcontract with the exact work, location, timing, project documents, and any owner consent or approval required under the main contract. What stays project-specific is which authority issues the license and how long the process takes, so the time needed to apply for a construction operation license in Vietnam should be built into the subcontract schedule rather than discovered after mobilization.
One condition is easy to miss at subcontract stage. A foreign contractor is generally expected to work with local participation, either through a joint venture with a Vietnamese contractor or by using Vietnamese subcontractors, unless local contractors cannot perform any part of the package. Where local participation is used, the content, volume, and value of the Vietnamese party’s work usually has to be identified. This shapes how a foreign specialist package is structured, so it belongs in the commercial discussion rather than in the licensing paperwork at the end.
The subcontract should pass down the obligations that the main contractor needs the subcontractor to perform, without creating gaps, overlaps, or conflicting responsibilities. The owner will usually continue to look to the main contractor for delivery under the main contract, even where a specialist package has been pushed downstream.
This is why scope allocation needs more than a general description such as mechanical works, electrical works, design support, or commissioning. The subcontract should show who owns the interfaces between design, procurement, installation, testing, document preparation, acceptance, and warranty. If the owner expects the main contractor to deliver an item that the subcontractor believes was excluded, the gap normally returns upstream as a main-contractor problem.
Flow-down obligations should also match the main contract in a practical way. The subcontractor may need to meet the same technical standard, schedule, reporting, acceptance, warranty, and document requirements that the main contractor owes to the owner, which is why the subcontract should be read against the main contract during EPC contract review in Vietnam. Direct owner instructions to the subcontractor should also be controlled, because an instruction that bypasses the main contractor can later create uncertainty over scope, variation, responsibility, and payment.
Company-level project readiness does not automatically answer whether the subcontractor’s foreign engineers, supervisors, or technical signatories can lawfully perform the roles assigned to them. The main contractor should treat personnel compliance as a separate workstream, especially where foreign specialists will sign technical records, supervise regulated work, or appear in the project acceptance file.
The problem often appears when the project is already moving. A foreign specialist may arrive to solve a technical issue, a subcontractor may replace an engineer at short notice, or a person may be given a title on site that does not match the role shown in the approved project records. Both the work permit for foreign engineers in Vietnam and any construction practicing certificate in Vietnam requirement should therefore be settled before the person starts signing documents, not explained afterward during acceptance, audit, handover, or a dispute.
The main contractor should therefore connect mobilization planning with the personnel list used for the project file. Replacement personnel should be reviewed before they take over technical responsibility, and the handover of drawings, testing records, open comments, and signing authority should be documented rather than treated as an internal staffing matter.
The main contractor should plan for the possibility that owner payment and subcontractor payment do not move at the same time, under the same conditions, or with the same tax treatment. A subcontractor may become entitled to payment before the owner pays the main contractor, while the owner may also require documents that the subcontractor has not yet supplied.
This creates a cash-flow and contract risk management issue between two different contract levels. The main contractor should know what evidence supports each subcontract payment, how retention and advance payments work, who approves variations, what deductions or back charges may be made, and whether any payment-sequencing clause is legally effective for the particular subcontract. The downstream payment process should not simply copy the owner contract without checking whether the same milestones and documents can actually be produced.
Foreign contractor tax is another practical exposure. Where a foreign subcontractor is paid from Vietnam, the main contractor should confirm the applicable tax method and whether it has any withholding, filing, invoicing, or payment responsibility. The tax position should be settled before the payment terms are finalized, because a tax cost identified later usually has to be absorbed somewhere in the contract chain.
The main contractor should control subcontractor records during performance because those records may later be needed for completion, construction acceptance inspection in Vietnam, handover, payment, audit, and warranty close-out. The subcontractor may complete its physical work successfully, but the main contractor can still be left with an incomplete project file.
This risk is especially practical at the end of a specialist package. Once the subcontractor demobilizes its engineers and document staff, missing signatures, test results, material certificates, as-built information, or defect close-out records become harder to reconstruct. The main contractor then has to chase records from a company that may already consider its work finished, while the owner continues to hold the main contractor responsible for the complete project dossier.
Document control should therefore start when the subcontract is signed and continue through each acceptance stage. The main contractor should define the required records, the format, responsible signatories, submission timing, and conditions for final payment or retention release. This makes document delivery part of performance rather than an administrative request made after site work is complete.
The main contractor should assume that a subcontractor failure may remain its problem under the main contract unless responsibility, site controls, and downstream recovery rights are clearly managed. The owner may claim delay, rectification, replacement, handover, warranty, or other project costs against the main contractor first, leaving the main contractor to recover from the subcontractor afterward.
The exposure is broader than defective work. A subcontractor can fall behind schedule, withdraw key personnel, fail to provide records, abandon the site, become insolvent, or refuse to return for defect correction. Site safety can create another layer of exposure. The subcontractor may control its own workers, but the main contractor still needs to coordinate project-wide interfaces such as access control, reporting, simultaneous work, emergency procedures, and communication of site rules.
The subcontract should give the main contractor practical options before the problem becomes critical. Depending on the package, these may include correction rights, step-in or replacement mechanisms, security, insurance, indemnities, termination rights, warranty obligations, and clear rules for completing or taking over unfinished work. The commercial team should also understand how these rights interact with liability caps and the main contract exposure to the owner.
The main contractor should check whether disputes with the owner and disputes with the subcontractor can be resolved in a compatible way before the subcontract is signed. One technical event can create two separate claims: the owner may pursue the main contractor under the main contract, while the main contractor needs to recover the same loss from the subcontractor.
The risk becomes harder to manage when the contracts point to different laws, courts, arbitration seats, languages, or escalation procedures. A delay or defect may have to be proved once against the owner and again against the subcontractor in another forum, with different parties and procedural rules. Even where both contracts use arbitration, joinder or consolidation should not be assumed to be available.
The dispute clauses should therefore be reviewed together, not in isolation. The main contractor should understand the governing law, forum, seat, language, notice and escalation steps, treatment of technical evidence, and where the subcontractor has assets that could support recovery. Where the contract points to arbitration in Vietnam, or where the same event may escalate into wider contract disputes in Vietnam, the coordination between the two routes should be settled at subcontract stage rather than after a claim arises.
| Area | Main contractor exposure | What to check |
| Legal readiness | Subcontractor may be unable to perform the assigned scope as planned | Entity, scope, license or approval position, timing, owner consent |
| Scope allocation | Work may fall between contracts or be duplicated | Scope matrix, exclusions, interfaces, flow-down obligations |
| Personnel | Technical records or project roles may be challenged | Work authorization, professional capacity, signatories, replacements |
| Payment and tax | Main contractor may carry cash-flow, deduction, or tax exposure | Milestones, retention, variations, deductions, tax, invoicing, currency |
| Project records | Completion and acceptance file may remain incomplete | Testing, quality, as-built, commissioning, and close-out records |
| Performance and safety | Owner may claim against the main contractor for subcontractor failure | Delay, defects, site safety, security, warranties, step-in rights |
| Disputes | Related claims may proceed in different forums | Governing law, forum, notices, joinder, enforcement |
The seven risks above are the areas the main contractor should control. The steps below show the practical order for putting that control in place, so there are more steps than risks.
Compare specialist capability, project schedule, legal readiness, foreign-personnel mobilization, tax and document burden, cost, and replacement risk.
A complete specialist package can simplify responsibility, while splitting the work may reduce dependence on one subcontractor but increase interface and coordination risk.
Direct technical communication can speed up work, but uncontrolled owner instructions may create variation, authority, evidence, payment, and responsibility disputes.
Replacement may protect the schedule but can create termination, site access, equipment, payment, safety, evidence, completion-file, and warranty issues. Final payment and retention should also be considered before replacement or close-out.
Q1: Does a foreign subcontractor need its own construction operation license in Vietnam?
Yes. The licensing requirement applies to foreign contractors by reference to the construction activities they perform, and a foreign company acting as a subcontractor falls within that definition. The license is issued for a specific contract, so a foreign subcontractor needs its own license for the scope it takes on. The practical question for each project is whether the assigned work amounts to construction activity and which authority issues the license.
Q2: Does the main contractor’s own license cover the foreign subcontractors working under it?
No. The license is granted to a named foreign contractor for a specific contract. It does not extend down the contract chain, so a foreign subcontractor cannot rely on the main contractor’s license and must hold its own for its own scope.
Q3: Does the project owner have to approve a foreign subcontractor?
Usually yes, and for two separate reasons. The award or selection decision from the owner or main contractor is normally part of the licensing dossier, and most main contracts also restrict subcontracting or require consent for a named subcontractor and scope. Check the main contract, tender and award documents before the subcontract is signed.
Q4: Is the main contractor still responsible to the owner if a foreign subcontractor causes delay or defective work?
Normally yes. Under most construction and EPC contracts the main contractor remains responsible to the owner for the whole scope, including work performed by subcontractors. The owner claims under the main contract first, leaving the main contractor to recover from the subcontractor afterward, which is why correction, step-in, replacement, security, and warranty rights matter in the subcontract.
Q5: Who handles foreign contractor tax when a foreign subcontractor is paid from Vietnam?
Foreign contractor tax generally applies to payments made from Vietnam to a foreign contractor or foreign subcontractor. Who registers the contract, withholds, and remits depends on the contract structure and the method used, so where a foreign main contractor pays a foreign subcontractor the allocation should be confirmed for that specific chain rather than assumed. The subcontract should also state clearly whether the price is gross or net of tax, because silence on that point can leave the paying party carrying a cost it did not budget for.
Q6: Can a dispute with the owner and a dispute with the subcontractor be heard together?
Not automatically. Joinder or consolidation depends on the dispute clauses in both contracts, the applicable rules, and the parties involved. The main contract and subcontract dispute clauses should be reviewed together before signing, because a mismatch can force the same delay or defect to be proved twice in different forums.
Foreign subcontractors in Vietnam construction projects can be the right commercial answer for a specialist package, but subcontracting moves the work rather than the exposure. The owner will usually still look to the main contractor for delivery, records, defects, and schedule. The main contractor keeps control by confirming the subcontractor’s own legal readiness before mobilization, passing down the obligations that matter, controlling personnel and project records during performance, and settling payment, tax, warranty, and dispute arrangements before they are tested.
Tuan Nguyen is the Managing Partner and founder of ANT Lawyers, with more than 20 years of experience across legal practice, management and compliance. He advises foreign companies, investors and manufacturers on corporate, commercial, international trade, regulatory and dispute-related matters in Vietnam. He holds an LLB from Hanoi National University School of Law and an MBA from Warwick Business School, and is an Associate Member of the Chartered Institute of Arbitrators.
Founded in 2012, ANT Lawyers is a Vietnam law firm with offices in Hanoi, Ho Chi Minh City and Da Nang. Our construction lawyers advise on construction contracts, licensing and regulatory compliance, project delivery issues and construction disputes in Vietnam. We combine legal analysis with practical understanding of Vietnam’s regulatory environment and local administrative practice.
This article is for general informational purposes only, does not constitute legal advice, and does not create a lawyer-client relationship. Vietnamese laws, regulations and administrative practice change over time, and the correct position for any matter depends on its specific facts and the rules in force when action is taken. Verify the current position before relying on anything stated here, and consult qualified counsel on your specific situation.
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