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Differentiating Between Design and Performance Specifications

Contractors may recover their increased costs of performance attributable to government-supplied defective specifications, provided they are design specifications rather than performance specifications. However, most government-furnished specifications contain both design and performance requirements. To recover under the Spearin doctrine, a contractor must prove that the requirement adversely affecting its performance relates to an area in which the government has expressly described how to perform. On the other hand, the contractor will be denied recovery if the government can show that the dispute concerns requirements that granted the contractor discretion to develop its own performance methodology to achieve necessary contractual objectives. Since it is not always clear whether the government has supplied a design or performance specification, the contractor may have to determine the amount of discretion granted by the specification. Such an analysis must be conducted by viewing the contract in its entirety and assessing the contractor’s overall discretion, along with the obligations imposed by the specification, before the requirement may be categorized as a design or performance specification. In this regard, the relevant inquiry may be the degree to which the contractor can exercise its ingenuity to achieve the contractual objectives and its ability to select the appropriate methodology to do so.

In Armed Services Board of Contract Appeals (ASBCA) No. 51310, it was determined that the requirement in dispute was a performance specification despite the contractor’s assertions that it was a mix of design and performance specifications. The 3rd Contracting Squadron at Elmendorf Air Force Base in Alaska awarded the fixed-price contract at issue for the demolition, relocation, and construction of on-base buildings. The pertinent specification concerned grading outside building lines, requiring a minimum of 2% grading for ten feet from the building. The contractor had to import additional fill material to meet the 2% grading requirement. The contractor argued that it was entitled to an equitable adjustment for its additional costs because the government had provided a combination of design and performance specifications that were defective because they did not specify the fill material necessary to complete the work. Additionally, the contractor maintained that the specifications contained a flawed assumption that the site would be flat. Meanwhile, the government took the position that the contract specified only a 2% grade and left it to the contractor to determine how to achieve it. The Board reviewed the specification and the contract as a whole and agreed with the government that the requirement was a performance specification, as the contractor was free to design its own method of grade away from the building, provided it met the 2% grade requirement. Finally, contrary to the contractor’s contentions, the Board’s overall review of the contract indicated that the government-supplied specifications did not assume a flat site and had no topographical information, which meant that offerors were expected to conduct a pre-bid site visit.

Meanwhile, in ASBCA No. 61184, covered in more detail here, the Board determined that the government had furnished defective design specifications, despite the government’s assertions to the contrary. In the large United States Army Corps of Engineers (USACE) construction contract, the government provided designs for the STRATCOM building, which included ductwork specifications that required the contractor to select a mastic that met ASTM C916 standards. Those standards contain specifications for duct adhesives but do not impose any anti-microbial requirements. Consistent with the standards, the contractor selected a mastic lacking antimicrobial properties, which the government approved. During construction, mold was discovered in the ductwork attributable to the mastic, increasing the cost of performance by nearly $41 million. Following the discovery, the USACE withdrew its approval and directed the contractor to use a specific mastic with anti-microbial properties. In the appeal that followed, the government argued that it had supplied performance specifications because the contractor could submit any compliant mastic for approval. However, the Board disagreed, finding that the government had furnished design specifications. The Board noted that the contractor had provided no input in drafting any contract specifications. Additionally, any discretion that the contractor had in selecting the mastic was limited by the government’s specifications, which required that the mastic meet the ASTM C916 standards. The contractor could not have selected the antimicrobial mastic that the government later directed the contractor to use, as that mastic did not meet those standards. Finally, the government had expressly approved the use of the defective mastic. Under these circumstances, the Board concluded that, although the contractor had some discretion to select the mastic, that discretion was limited by the government. Therefore, the defective specification was deemed a design specification, and the contractor recovered under the Spearin doctrine.

Since most government-supplied specifications include both design and performance components, to obtain recovery under the Spearin doctrine, the contractor must demonstrate that its increased cost of performance is attributable to an area covered by defective design specifications. As shown in the cases described above, it may not always be straightforward to determine whether a particular defective specification is a design or a performance specification. In this regard, the central inquiry is the amount of discretion granted to the contractor to exercise its ingenuity in achieving the project’s relevant objectives or performance standards, including selecting the appropriate means to do so. The more discretion the contractor is afforded under the defective specifications, the more likely it is that the specifications would be deemed performance specifications. In case of performance specifications, the contractor is typically unable to recover its increased cost of performance unless it can demonstrate that the specifications at issue embody requirements that are objectively impossible or commercially senseless. On the other hand, if the government-furnished specifications do not allow the contractor to deviate and expressly describe how performance must be undertaken, then the specifications are design specifications. Government-supplied design specifications may include detailed measurements, tolerances, specified materials, etc. In case the contractor relies on defective design specifications, it may recover under the Spearin doctrine, as the government is in breach of the implied warranty that the specifications it supplied would yield satisfactory results.

This Federal Contract Claims Insight is provided as a general summary of the applicable law in the practice area and does not constitute legal advice. Contractors wishing to learn more are encouraged to consult the TILLIT LAW PLLC Client Portal or Contact Us to determine how the law would apply in a specific situation.

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Firm-fixed-price contracts place maximum risk and full responsibility upon the contractor for all costs and resulting profit or loss incurred in performing a government contract. Fixed price contracts provide for a price that is not subject to any adjustment based on the contractor’s cost experience. Meanwhile, fixed-price contracts with economic price adjustments provide for upward or downward revisions of the stated contract price upon the occurrence of specified contingencies. There are three general types of price adjustments. First, price adjustments based on established prices provide for increases or decreases from an agreed-upon level in published prices of specific items. Second, adjustments based on actual costs of labor or materials contemplate increases or decreases in the specified costs of labor or materials actually experienced by the contractor during contract performance. Finally, adjustments based on labor or material cost indexes provide for increases or decreases in labor or material cost standards or indexes identified explicitly in the contract. In fixed-price contracts that do not provide for economic price adjustments, the contractor assumes the risk of unexpected costs not attributable to the government.

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Contractors may sometimes encounter unforeseen conditions that make a government contract commercially impracticable because performance would cause extreme and unreasonable difficulty, expense, injury, or loss. Unless the contractor has assumed the risk of the unforeseen condition, a finding of commercial impracticability excuses the contractor from performing. In other situations, commercial impracticability may be treated as a constructive change, warranting an equitable adjustment due to the substantial, unforeseen costs imposed upon the contractor. Whether the performance of a contract would be commercially impracticable is a question of fact to be resolved on a case-by-case basis. Therefore, adjudicative forums have consistently declined to adopt a bright-line rule providing that a certain percentage of cost overrun automatically constitutes commercial impracticability. However, due to the potential for abuse, the standard for establishing commercial impracticability is challenging to meet, and contractors are not entitled to relief merely because they are unable to sustain their profit margins.

In Armed Services Board of Contract Appeals (ASBCA) No. 63615, a decision issued on May 19, 2025, the Board granted the agency summary judgment on the issue of commercial impracticability when the contractor suffered a 37% cost overrun on a construction contract. The U.S. Army Corps of Engineers (USACE) issued the underlying contract for construction work at Placement Area No. 10 in the Corpus Christi Ship Channel. The total adjusted contract price following all modifications was $11,046,369.04. During performance, the contractor encountered excessive erosion on the south side of the placement area. Subsequently, the work to address the erosion was added to the contract via two bilateral contract modifications addressing the inland and shoreline sides of the placement area, totaling $909,332.04. However, even after the modifications, the contractor continued to incur costs and expend additional resources. A year after the contract was deemed substantially complete, the contractor submitted certified claims asserting entitlement to roughly $3,560,723.65 in cost overruns for work associated with the first modification and $447,522.64 in cost overruns for the second modification. These claims were denied by the contracting officer (CO) in their entirety.

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Under the Spearin doctrine, when the government furnishes design specifications directing the contractor on how to undertake performance on a contract, it provides an implied warranty that the contractor will be able to perform the contract satisfactorily if it adheres to the government’s specifications. The doctrine allows contractors to transfer to the government the risk of increased costs resulting from defective specifications. Notably, however, the Spearin doctrine only applies when the defective specifications are design specifications as opposed to performance specifications. Design specifications expressly describe how contract performance must be undertaken and do not permit the contractor to make any deviations. Meanwhile, performance specifications state the overall objectives that must be achieved but leave the decisions on how to achieve those objectives at the discretion of the contractor. Since design specifications do not allow deviations or grant the contractor discretion in achieving contractual objectives, the government implicitly warrants that design specifications are free from defects. Consequently, when the government’s design specifications are defective or result in unsatisfactory performance the government is deemed to have breached its implied warranty of specifications under the Spearin doctrine. In such cases, the contractor may recover all proximate costs stemming from the government’s breach.

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The government may provide design specifications to the contractor for the performance of a government contract, directing work and implying a warranty that the supplied specifications are free of defects. Under the Spearin doctrine, if the government’s design specifications are then found defective or result in unsatisfactory performance, the contractor is permitted to recover its increased costs of performance attributable to the defective specifications. To obtain such recovery, the contractor must prove a causal connection between the defective specifications and the additional costs incurred to resolve the issue. Significantly, however, to recover under the Spearin doctrine, a contractor must demonstrate that it substantially complied with the government-furnished plans and specifications and that, despite its compliance, the end result was unsatisfactory. On the other hand, if the contractor does not comply with the government’s specifications, it may not recover its increased costs of performance under the Spearin doctrine, even if the government's design specifications are ultimately found defective.

In Armed Services Board of Contract Appeals (ASBCA) No. 62627, a decision issued on February 13, 2024, the Board determined that the contractor could not recover under the Spearin doctrine because it had failed to demonstrate compliance with the government-supplied specifications. The Naval Facilities Engineering Systems Command (NAVFAC) Southwest (SW) awarded a task order for roughly $4.3 million under a previously issued indefinite delivery, indefinite quantity (IDIQ) contract for the renovation of Building 53423 at the Marine Corps Base Camp Pendleton in California. Among other things, the project required the contractor to remove and dispose of all existing hazardous materials, including asbestos, and to perform abatement and cleanup services as necessary. The project also required the removal and replacement of non-load-bearing partition walls to support potential space reconfiguration. The order noted that the removal of any additional walls during construction would be handled as a modification. As relevant to the interior walls, the government stated in RFI 20, a pre-award request for information (RFI), that there may be small amounts of asbestos tiles under the wall framing where interior walls were being demolished.

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Differentiating Between Design and Performance Specifications

TILLIT LAW Federal Contract Claims Insights