NLA Insights
10 August 2026
When does a change on site become a “variation” in the eyes of the contract? Reading Somdatt Builders-NCC-NEC (JV) v. NHAI alongside the Delhi High Court’s decisions in Hindustan Construction Co. and JSC Centrodorstroy, this piece traces how Indian courts have anchored variation claims to the contract’s own machinery — and where the contractor’s remedy stops.
The construction sector in India is beset by disputes that stem largely from disruptions in the quantity, quality, scope and timeline of projects. When such disruptions occur, the Contractor risks incurring losses in the course of completing the work. This article examines the nuances of Variation Claims and the reliefs available to an affected party under the governing contractual provisions, and traces the judicial developments that have shaped how these claims play out in practice.
Variation Claims are among the most recurring and common disputes arising out of construction and infrastructure contracts. Unlike ordinary commercial contracts, construction contracts usually run over an extended period and are inherently exposed to changes in design, quantities, specifications, site conditions, statutory requirements and Employer instructions. Most such contracts therefore build in a mechanism allowing the Employer or the Engineer-in-Charge to alter, add to, substitute or omit works during execution.
The difficulty arises when the Contractor treats a change as a variation carrying an additional costs entitlement, while the Employer treats the very same change as work already contemplated within the original scope, or as an item to which the agreed rates continue to apply. Resolving that dispute is where the courts and arbitral tribunals step in.
A variation claim may arise where the work to be executed departs from the scope, quantity, specification or method originally contemplated under the contract. A contract may provide, for instance, that quantities varying within a specified percentage will be paid at the agreed BOQ rates, while anything beyond that threshold is valued at revised or market rates. Entirely new items may need to be priced through rate analysis, and substituted items valued by reference to both the original and the replacement item.
Variation claims need not be conflated with adjacent categories of claims. For instance, a change in law claim arises out of external statutory or regulatory action, while claims for prolongation of the contract typically travel under their own, separate notice provisions. Variation claims, by contrast, commonly cover an increase or decrease in the quantities of existing BOQ items; deviation beyond the contractual deviation limit; extra items, meaning work not contained in the original BOQ; substituted items, where one contractual item replaces another; alteration in specifications, drawings or design; addition or omission of work; a change in construction methodology; a change in scope or functional requirements; and, in appropriate cases, work arising from Employer’s instructions.
The practical contours of this area are best understood through the line of judgments discussed below, each of which grapples with a slightly different facet of the same underlying question: when does a change on site actually become a “variation” in the eyes of the contract?
The Hon’ble Supreme Court’s ruling in Somdatt Builders-NCC-NEC (JV) v. NHAI, (2025) 6 SCC 757 provides a recent and significant illustration of how courts may approach the question of what constitutes a variation under COPA (Conditions of Particular Application)-based contracts. The dispute was concerned with a claim for rate revision after the quantity of geogrid required for execution exceeded the BOQ estimate by roughly 300%. The Arbitral Tribunal found that this overrun stemmed from an erroneous tender-stage estimate furnished by NHAI itself, and not from any instruction issued by the Engineer under Clause 51.1. Since the proviso to Clause 51.2 expressly excluded automatic quantity fluctuations from requiring an instruction, the Tribunal held that Clause 52’s rate-renegotiation mechanism was never triggered, and the Supreme Court agreed that this was a plausible reading of the contract, squarely within the Tribunal’s jurisdiction.
The Apex Court went further and reiterated that appellate courts exercising jurisdiction under Section 37 of the Arbitration and Conciliation Act, 1996 are not entitled to displace such an interpretation merely because an alternative reading of the word “variation” was conceivable. Two threads run through this reasoning at once: (i) a textual reading of the contractual definition, and (ii) a self-imposed limit on the scope of appellate scrutiny under Section 37 of the 1996 Act. Read together, Clauses 51.1 and 51.2 anchor the definition of “variation” firmly to instruction-based changes, foreclosing any construction that would treat every quantum departure — regardless of its cause — as falling within the contract’s variation machinery.
The Court also reaffirmed the now-familiar principle that judicial interference with a Tribunal’s plausible interpretation of contractual terms must remain minimal, since frequent interference with arbitral awards would defeat the very purpose of the 1996 Act.
A useful counterpoint comes from the Hon’ble Delhi High Court’s decision in National Highways Authority of India v. Hindustan Construction Co. Ltd., 2018 SCC OnLine Del 8020, where the Engineer had directed substitution of a fly-ash embankment with borrow earth, and a viaduct in place of a retaining wall — work that plainly fell outside the original scope. The Court affirmed the Tribunal’s reasoning that this variation order entitled the contractor to claim appropriate rates for the affected BOQ items under Clause 52.1 of the contract. The Division Bench, agreeing with the Single Bench, held that no interference was warranted under Section 34 of the 1996 Act, since the award rested on plausible grounds.
A further illustration of the remedial mechanism comes from National Highways Authority of India v. JSC Centrodorstroy, 2019 SCC OnLine Del 7981, where the Court examined whether re-compaction beyond scarification, although involving an item included in the BOQ, amounted to varied work because it fell outside the applicable Technical Specifications. Relying on Clause 51, the Court found that this work was indeed Varied Work, and upheld the Engineer’s authority under Sub-Clause 2.1(d)(ii) to fix rates for variations up to 1% of the contract price without needing the Employer’s approval. Rate determination, in other words, was left to the Engineer under Clause 52.1 rather than requiring fresh arbitral quantification — a point also echoed in Somdatt Builders, reinforcing the mechanism under Clause 52. Here too, the Court declined to interfere with the Tribunal’s technically plausible view in a petition filed under Section 34 of the 1996 Act.
Beyond the definitional question of what counts as a variation, Indian jurisprudence also draws a firm line around where a contractor’s remedy stops. In Somdatt Builders, the Court held that once the Arbitral Tribunal had found no instructed variation, the contractor’s entitlement was confined to the BOQ rate applied to the work executed — nothing more. That ratio was also used to uphold the plain text of Clauses 51 and 52 against the Division Bench’s equity-driven reasoning, which had attempted to reopen a remedy the Arbitral Tribunal had already settled. Similarly, in JSC Centrodorstroy, the Court emphasised the Engineer’s authority to fix rates for variations strictly within the contractual framework, leaving no room for that determination to be revisited under Section 34 of the 1996 Act.
Variation claims in construction contracts are, at their core, a balancing act between contractual discipline and commercial reality. The jurisprudence discussed above makes two things equally clear: (i) a Contractor cannot claim additional compensation merely because the quantities executed exceeded what was originally contemplated, and (ii) an Employer cannot escape a legitimate variation claim by mechanically labelling materially different, substituted, additional or instructed work as part of the original scope.
The first and most important enquiry, therefore, is always into the contract itself — what constitutes a variation, when an Engineer’s instruction is required, how the variation is to be valued, and what notice and procedural requirements govern the Contractor’s entitlement. Somdatt Builders, Hindustan Construction Co. Ltd. and JSC Centrodorstroy together illustrate that the contractual machinery remains the primary source for determining both entitlement and valuation, even as courts continue to recognise the narrow scope of judicial intervention where an Arbitral Tribunal has adopted a plausible interpretation of the contract.
The takeaway is a practical one: a successful variation claim needs more than proof of additional expenditure. It requires establishing the contractual trigger, demonstrating the causal link between the change and the resulting work or cost, and placing reliable contemporaneous records before the adjudicating forum. Ultimately, variation jurisprudence reflects a broader principle of construction law — the financial consequences of a change in the contracted work must follow the risk allocation and valuation mechanism the parties themselves agreed to, and not be rewritten later by hindsight, commercial equity, or the sheer size of the bill.
© Nirka Law Advisory. All rights reserved. For queries, connect with us.
