Substantial Breach

In one sentence

A failure to perform a contract that goes to the heart of the deal.

Plain English

A substantial breach is when someone breaks a contract in a major way—not just a minor slip-up, but something that defeats the whole purpose of the agreement. It's serious enough that the other party can refuse to perform their side and potentially sue for damages. The key question is whether the breach is so significant that the innocent party didn't get the benefit of what they bargained for.

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Example

You hire a contractor to build a house with a specific foundation design. The contractor builds it with a completely different foundation that's structurally unsound. This is a substantial breach because the house doesn't meet the core requirement, even if other parts of the work are done well.

Used in a sentence

“The buyer claimed a substantial breach when the seller delivered goods that were the wrong color, size, and quality.”

Related terms

Actual Performance

Completing all the obligations required under a contract exactly as promised.

Breach of Warranty

Failing to fulfill a promise or guarantee made about a product or service.

Material Alteration

A significant change to a contract or document that affects its meaning or enforceability.

Damages Calculation

The process of determining how much money a harmed party should receive for a breach.

Equitable Relief

A court remedy other than money, like ordering someone to do or stop doing something.

Termination for Convenience

Ending a contract without cause, usually by paying a penalty or notice fee.

Offer

A proposal to enter into a binding agreement on specific terms.

Acceptance

Agreeing to the exact terms of an offer, creating a binding contract.

This page is a plain-English reference and is not legal advice. Laws vary by jurisdiction and change over time. For specific situations consult a licensed attorney.