Proof of damages

Understanding Proof of Damages Through Oral Testimony

When pursuing compensation for defective work or breach of contract, one of the biggest challenges plaintiffs face is proving the actual dollar amount of their damages. Many assume that extensive documentation, receipts, or formal expert testimony is required to establish these costs in court. However, New York law recognizes that damages can sometimes be proven through other means, including the oral testimony of knowledgeable witnesses.

This principle becomes particularly important in construction disputes, where experienced contractors may be able to provide reliable cost estimates based on their professional knowledge, even without written documentation. The question becomes: when is oral testimony alone sufficient to prove damages, and what qualifies a witness to provide such testimony?

Case Background

In Johnson v Robertson, the plaintiffs hired the Robertson defendants, experienced contractors with twenty years in the construction industry and over 100 homes built, to construct a residence. During construction, disputes arose regarding defective workmanship and incomplete performance. The plaintiffs sought damages for the cost of correcting and completing the work that the Robertson defendants had allegedly performed defectively or left unfinished.

At trial, the Robertson defendants testified about the costs that would be necessary to remedy the defects and complete the unfinished work. Significantly, they provided these cost estimates based solely on their professional experience and knowledge of construction costs in the relevant market. They did not present written estimates from other contractors, receipts for hypothetical repair costs, or formal expert reports from construction consultants. The trial court had to determine whether this oral testimony, standing alone, provided sufficient evidence to support a damages award.

Jason Tenenbaum’s Analysis:

Johnson v Robertson, 2015 NY Slip Op 06658 (2d Dept. 2015).

Moreover, “roof of damages may be based solely on oral testimony as long as the witness has knowledge of the actual costs” (Electronic Services. Intl. v. Silvers, 284 A.D.2d 367, 368, 726 N.Y.S.2d 441). The record demonstrates that the Robertson defendants, who had 20 years of experience in construction and had built over 100 homes, had knowledge of the actual costs of the services being provided

You have someone who is close to an expert who tells you that it will cost $40,000 to fix a prior contractor’s defective work. This testimony does not have an etiology in documentary evidence; it is solely based upon the contractor’s knowledge. Enough? Many judges will say no (true case I tried). The Appellate Division said otherwise.

Legal Significance

The Second Department’s decision in Johnson v Robertson reaffirms and applies the principle established in Electronic Services International v Silvers that damages proof need not always rest on documentary evidence. The court recognized that practical knowledge derived from years of hands-on experience in an industry can provide a sufficient foundation for cost testimony. This holding reflects a common-sense understanding that experienced professionals develop reliable knowledge of market costs through repeated exposure to similar transactions and projects.

The decision distinguishes between situations requiring formal expert testimony under CPLR Article 31 and those where a fact witness with specialized knowledge can testify about costs based on personal knowledge. The Robertson defendants were not retained as expert witnesses to provide opinions; rather, they were parties to the litigation who happened to possess relevant industry expertise. Their testimony about construction costs fell within the scope of their actual knowledge of costs, making it admissible as fact testimony rather than expert opinion.

However, the decision should not be read to eliminate the importance of documentation in damages cases. The court emphasized that the witnesses had “knowledge of the actual costs”—not mere speculation or guesswork. Their twenty years of experience and construction of over 100 homes provided the foundation for reliable cost estimates. Less experienced witnesses or those testifying about costs outside their area of expertise might not satisfy this standard.

Practical Implications

For plaintiffs seeking damages in construction disputes, Johnson provides valuable precedent when documentary evidence of repair costs is unavailable or impractical to obtain. Rather than necessarily hiring expert witnesses to provide formal cost estimates, plaintiffs may be able to prove damages through testimony from experienced contractors involved in the project or others with relevant industry knowledge. This approach can significantly reduce litigation costs while still providing reliable evidence of damages.

However, practitioners should exercise caution in relying exclusively on oral testimony for damages proof. The witness’s qualifications and experience become critical when documentary evidence is lacking. Before trial, attorneys should thoroughly develop the witness’s background, including years in the industry, number of similar projects completed, and familiarity with local market costs. This foundation establishes the witness’s knowledge and credibility when presenting cost testimony.

Defense attorneys facing oral damages testimony should carefully examine the witness’s actual knowledge of costs. Cross-examination should focus on whether the witness has recent, specific knowledge of the costs being claimed, or whether the testimony represents speculation based on outdated or generalized information. The absence of supporting documentation, while not fatal to the plaintiff’s case, may provide opportunities to challenge the reliability and accuracy of oral cost estimates.

Key Takeaway

The Appellate Division’s decision in Johnson v Robertson establishes that extensive experience and knowledge in a relevant field can qualify a witness to testify about damage costs based solely on oral testimony. This ruling provides important precedent for cases where formal expert witnesses may not be available or necessary, particularly in construction disputes where seasoned professionals can reliably estimate repair costs. However, the witness must possess genuine knowledge of actual costs derived from substantial industry experience, not mere speculation or general familiarity with the field.