Define: Ordinary Diligence

What Ordinary Diligence Means in a Contract

Ordinary Diligence describes a baseline standard of care that a contracting party must exercise when reviewing documents, following instructions, and performing obligations under an agreement. It is the level of attention, thoroughness, and prudence that a reasonably careful and competent person would apply under normal circumstances, neither more nor less. This standard is frequently invoked when a contract needs to describe how a party should examine plans, drawings, specifications, or other supporting materials before beginning work.

The term matters because contracts rarely expect perfection. Instead, most agreements set a workable benchmark that balances practicality against accountability. A party exercising Ordinary Diligence is expected to notice obvious discrepancies, ask reasonable questions, and act in a manner consistent with standard industry practice, but is not held to the higher bar of expert-level scrutiny unless the contract specifically requires it.

This concept often appears alongside broader due diligence obligations, and understanding the distinction is important. While a Due Diligence Checklist might be used in a transactional context to verify facts before a deal closes, Ordinary Diligence in a performance contract is about the day-to-day standard of care applied while carrying out contractual duties.

How Ordinary Diligence Is Defined or Measured

Because Ordinary Diligence is inherently a comparative standard, it is usually measured against what a reasonably prudent person or professional in a similar position would do under similar conditions. Courts applying the law governing the contract typically look at industry custom, the complexity of the task, and whether the party's conduct fell within a range of acceptable behavior rather than requiring flawless execution.

Several factors commonly inform how this standard is assessed in practice:

• The nature and complexity of the plans or documents being reviewed
• Whether the conditions were normal or unusually difficult
• Industry-standard practices for similar work
• The experience level reasonably expected of the party performing the task
• Whether obvious errors or omissions should have been detected

Unlike a strict liability standard, Ordinary Diligence allows for honest mistakes that a careful person could still make. The focus is on the process followed, not necessarily the outcome achieved, which distinguishes it from stricter performance guarantees found elsewhere in a contract.

Where Ordinary Diligence Appears in Agreements

This term shows up most often in construction, engineering, and professional services contracts where a party is instructed to examine drawings, specifications, or site conditions before commencing work. It is common in the construction industry, where contractors are frequently required to review architectural plans with ordinary care to identify inconsistencies before construction begins.

Ordinary Diligence clauses also appear in a Statement of Work, where the scope of review expected from a contractor or service provider needs to be clearly bounded. It can likewise surface in consultancy agreements, manufacturing supply contracts, and technology implementation agreements where a party must interpret technical documentation before delivering a product or service.

In some agreements, the term is paired with broader terms and conditions language, particularly where a party's liability depends on whether it met the expected standard of review. Reviewing how this obligation interacts with a Terms and Conditions document can clarify how much scrutiny a party is expected to apply before accepting responsibility for errors.

Why the Exact Wording Matters

The precise phrasing used to describe Ordinary Diligence can significantly affect how disputes are resolved. If a contract simply says a party must act with reasonable care without defining what that means in context, ambiguity can arise about whether the party met its obligations. Clear wording that ties the standard to specific documents, conditions, or industry norms reduces the risk of disagreement later.

Vague diligence language can also create unintended gaps in liability. If one party assumes Ordinary Diligence is enough while the other expected a higher standard, such as expert-level or heightened diligence, the resulting dispute can be costly and difficult to resolve without litigation or arbitration under the law governing the contract.

Drafting Considerations

When drafting a clause referencing Ordinary Diligence, it helps to specify exactly what documents or conditions the standard applies to, such as reviewing plans, specifications, or site reports. Being explicit about the scope of review avoids later arguments about what was actually expected of the performing party.

Drafters should also consider whether Ordinary Diligence is the appropriate standard at all, or whether the contract's subject matter warrants a higher level of care, such as professional or expert diligence. In technical or high-risk agreements, a heightened standard may be more appropriate, while in routine commercial arrangements, Ordinary Diligence often strikes the right balance between fairness and practicality.

Finally, it is useful to cross-reference this standard with any related obligations, such as those found in a Due Diligence Report, to ensure consistency across the document. Aligning definitions throughout the contract helps prevent conflicting interpretations and supports smoother enforcement if a dispute arises.