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[Case Study] A USD 50 Million EPC Dispute Over the Price Adjustment Clause: Lessons for Employers

Anonymity statement: The scenario below is hypothetical, constructed for legal analysis and lessons-learned purposes. All company and personal names, locations and case details are entirely fictional and are not based on, nor do they refer to, any real matter.

Table of contents

1. The scenario: a large-scale factory project derailed mid-way

Consider this hypothetical. Company A — an FDI manufacturer of electronic components — decided to build a new factory at an industrial park in northern Vietnam. To keep things simple, Company A signed a lump-sum turnkey EPC contract of substantial value with Contractor B, an experienced international EPC contractor. The contract stated: a fixed lump-sum price, not subject to adjustment throughout the 24-month performance period, except where the employer ordered design changes.

The first 10 months went smoothly. In month 11, structural steel prices spiked nearly 40% amid global supply-chain disruption; copper, aluminium and logistics costs climbed too. Contractor B sent a formal notice demanding a substantial price increase, warning it would otherwise have to suspend certain works because it "could not continue at the old price without heavy losses."

Company A responded firmly: the contract clearly fixed the price with no adjustment — Contractor B must bear price-fluctuation risk; that is the very nature of lump-sum EPC. Contractor B countered: this material price surge was "practically force majeure," far beyond any reasonable forecast at signing, and forcing loss-making performance would compromise construction quality.

The standoff lasted 3 months. The project fell 5 months behind schedule. The dispute ultimately went to commercial arbitration under the contract's arbitration clause.

Analysed under Vietnamese law, three layers emerge:

Layer 1 — What does the contract say? This is decisive. A lump-sum EPC contract with a "fixed, non-adjustable price" clause is a lawful agreement reflecting freedom of contract. Under Article 36 of Decree 37/2015/ND-CP (amended by Decree 50/2021/ND-CP), construction contract prices may be adjusted in cases agreed in the contract. In other words, the law respects the price the parties locked in — without a contractual "door" for adjustment, the contractor can hardly force one open unilaterally.

Layer 2 — Is a material price surge a "fundamental change of circumstances"? Contractor B might invoke Article 420 of the Civil Code 2015 on fundamental change of circumstances: where circumstances change materially and unforeseeably, and continued performance would cause grave harm to one party, the affected party may request renegotiation and, failing agreement, ask the court to terminate or revise the contract. But the bar for Article 420 in Vietnamese adjudication practice is very high: market price movements, even large ones, are generally treated as ordinary commercial risk that a professional contractor should have priced into a lump-sum EPC bid. Not every price rise qualifies for adjustment.

Layer 3 — Duties to mitigate and perform in good faith. During the dispute, both sides owed duties to limit losses: the employer could not sit idle while delay accumulated and blame everything on the contractor; the contractor could not use work suspension as leverage unless the contract permitted it. Article 143 of the Construction Law 2014 on construction contract adjustment likewise stresses that adjustments must rest on contractual agreement and legal provisions.

The legal conclusion at this level of analysis: Company A's position (holding the lump-sum price) rested on stronger contractual ground — but that did not guarantee victory; the tribunal would assess everything, including whether the employer negotiated in good faith.

3. Handling options: from negotiation to arbitration

In this hypothetical, the options in order of preference:

Option 1 — Negotiated risk-sharing (recommended). Instead of winner-takes-all, both sides sit down with transparent figures: Contractor B proves actual cost increases with invoices and records; Company A considers partial support (e.g. adjusting prices for material fluctuations beyond a 15% threshold, the contractor absorbing the rest). A contract addendum records an adjustment mechanism for the remaining works to prevent recurrence. This option is fast, cheap, and preserves the relationship and schedule.

Option 2 — Commercial mediation. If direct negotiation deadlocks, bring in an independent mediator with construction expertise. Mediation preserves confidentiality and flexibility — well suited to technically and legally complex EPC disputes.

Option 3 — Commercial arbitration. The last resort when all talks collapse. Arbitration suits high-value, cross-border EPC disputes needing confidentiality and deep expertise. Downsides: cost, duration, and a near-certain end to the working relationship.

In the hypothetical, the parties ended up at option 3 — the most regrettable outcome.

4. The outcome and the price paid

Assume the tribunal held: the lump-sum price stands (rejecting Contractor B's price-increase claim), but found Company A partly responsible for delay for failing to negotiate in good faith during the first 3 months — each side bearing part of the arbitration costs and its own legal fees.

The total "bill" of this hypothetical dispute:

  • 5 months of delay: the factory's late commissioning cost Company A revenue and breached customer commitments.
  • Dispute costs: arbitration fees and both sides' legal fees for a protracted case — significant against the large amount originally at stake.
  • Destroyed relationship: Contractor B completed the project adversarially; post-completion warranty and maintenance quality could hardly be expected.
  • The costliest lesson: all of this could have been avoided with a carefully drafted price adjustment clause — drafting costs a fraction of dispute costs.

5. Lessons for employers and contractors

For employers:

  1. Don't overreach with absolute lump-sum pricing. A lump-sum price with no adjustment mechanism looks safe, but when major fluctuations hit, contractors will find ways to "recover" — cutting quality, slowing progress, or suing. A threshold-based adjustment mechanism protects both sides.
  2. Draft detailed adjustment clauses from day one: scope, formula, activation thresholds, notice procedures, response deadlines, disagreement resolution.
  3. Don't ignore a struggling contractor. Good-faith early negotiation is not only commercially sound but weighs heavily with tribunals if disputes arise.

For contractors:

  1. Don't bid lump-sum recklessly. Price material-volatility margins into the bid, or negotiate adjustment clauses upfront.
  2. Follow notice procedures. Every adjustment claim must be written, timely, and evidenced — the "entry ticket" to any claim.
  3. Don't use work suspension as leverage unless the contract allows it; unilateral stoppage can turn the contractor from "victim" into "breaching party."

For both sides: the dispute resolution clause (negotiation → mediation → arbitration) must be in the contract before disputes arise. Looking for a mechanism after the relationship sours is too late.

6. A drafting checklist for the price adjustment clause

If this case teaches one thing, it is that the adjustment clause deserves the same care as the price itself. When drafting or reviewing one, run through this checklist:

  1. Trigger events — list them exhaustively: material price indices, exchange-rate movements beyond a band, changes in tax law, employer-ordered variations, and force-majeure-type cost impacts.
  2. Reference index — tie material adjustments to a published, verifiable index (e.g. a steel price index both sides accept), not to "market price" in the abstract.
  3. Threshold and formula — state the percentage that activates adjustment and the exact calculation method, with a worked example in an annex.
  4. Notice discipline — the contractor must give written notice within a fixed number of days of becoming aware of the trigger, with supporting evidence; late notice weakens or forfeits the claim.
  5. Employer's response window — e.g. 28 days to accept, negotiate or reject with reasons; silence should not equal consent.
  6. Interim arrangement — while the adjustment is disputed, works continue and the undisputed portion is paid on time; price disputes must not become schedule disputes.
  7. Cap and floor — consider a ceiling on total adjustments so the employer keeps budget control, and a floor so the clause is not one-sided.
  8. Dispute path — refer adjustment disagreements to the contract's engineer/DAB first, then mediation or arbitration — never leave them to ad hoc argument.

A clause that answers all eight points rarely produces a costly surprise.

7. FAQ

Q: Can a lump-sum EPC contract price be adjusted?

A: Yes, if the contract contains a price adjustment clause or the law permits it in specific cases. Under Decree 37/2015/ND-CP (amended by Decree 50/2021/ND-CP), construction contract prices may be adjusted as agreed in the contract. Without such a clause, a contractor can hardly demand a unilateral increase — the very lesson of this case study.

Q: How should a price adjustment clause be drafted in an EPC contract?

A: It should specify: (1) adjustment triggers (material price fluctuation, tax policy changes, employer-ordered design changes); (2) the formula or calculation method; (3) activation thresholds (e.g. fluctuation beyond 5–10%); (4) notice procedures and response deadlines; (5) a mechanism for resolving disagreements. The more detailed, the fewer disputes.

Q: Must an employer accept a mid-project price increase demanded by the EPC contractor?

A: Not automatically. The employer should check: does the contract have an adjustment clause, does the cited event fall within its scope, and did the contractor follow the notice procedure? Without contractual basis, the employer may refuse and require continued performance on schedule.

Q: Arbitration or court for EPC disputes?

A: For high-value EPC contracts, especially with foreign elements, commercial arbitration is usually preferred for confidentiality, flexibility and cross-border enforceability. The prerequisite is a valid arbitration clause from the outset.

Need advice tailored to your situation? Contact FLAT Law Firm — hotline 0988424851.

References

  • Construction Law 2014 (No. 50/2014/QH13).
  • Decree 37/2015/ND-CP on construction contracts; amended by Decree 50/2021/ND-CP.
  • Civil Code 2015 (No. 91/2015/QH13).
  • The scenario is entirely hypothetical, for legal analysis purposes.

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