Define: Perpetual Injunction

Perpetual Injunction
Perpetual Injunction
Quick Summary of Perpetual Injunction

A perpetual injunction, also known as a permanent injunction, is a court order that permanently prohibits a person or entity from taking a certain action. For instance, if a company is found to have infringed on another company’s patent, a perpetual injunction may be issued to stop the infringing company from using the patented technology. This type of injunction is granted after a final hearing on the merits of the case. Despite its name, a perpetual injunction is not always permanent and can be changed or lifted if circumstances change.

What is the dictionary definition of Perpetual Injunction?
Dictionary Definition of Perpetual Injunction

A perpetual injunction is a court-issued order that permanently prohibits an individual or organisation from engaging in a specific action. This type of injunction is granted following a final hearing on the merits and is intended to prevent irreparable harm. Despite its name, a perpetual injunction does not always have an indefinite duration. It is only granted after the defendant has been notified and given a chance to present their case.

Full Definition Of Perpetual Injunction

A perpetual injunction, often referred to as a final or permanent injunction, is a legal remedy that commands a party to perform or refrain from performing certain actions indefinitely. This form of injunction is typically granted following the resolution of a full trial and is intended to provide a lasting solution to the dispute between the parties. This overview will delve into the legal framework, principles, and applications of perpetual injunctions within the British legal system.

Legal Framework

In the United Kingdom, the power to grant injunctions, including perpetual injunctions, is vested in the courts by the Senior Courts Act 1981. Section 37(1) of the Act provides that the High Court may grant an injunction in all cases in which it appears to be just and convenient to do so. This statutory provision is supplemented by the rules of equity, which guide the courts in determining when it is appropriate to grant such relief.

Principles Governing Perpetual Injunctions

The courts consider several principles when deciding whether to grant a perpetual injunction. These principles ensure that the remedy is applied judiciously and fairly, balancing the interests of both parties involved.

  • Irreparable Harm: The claimant must demonstrate that they would suffer irreparable harm if the injunction is not granted. Irreparable harm refers to damage that cannot be adequately remedied by monetary compensation. This harm must be significant and not merely trivial or speculative.
  • Adequacy of Damages: Courts will assess whether an award of damages would be a sufficient remedy for the harm suffered by the claimant. If damages are deemed adequate, a perpetual injunction is less likely to be granted.
  • Balance of Convenience: The court will weigh the balance of convenience, considering whether the harm to the claimant, if the injunction is not granted, outweighs the harm to the defendant if it is granted. This involves evaluating the impact of the injunction on both parties and any third parties.
  • Clean Hands Doctrine: The claimant must come to the court with clean hands, meaning they must not have engaged in any unethical or improper conduct related to the subject matter of the injunction. Equity will not assist a claimant who has acted in bad faith.
  • Laches: This principle considers whether the claimant has unduly delayed in seeking the injunction. If there has been an unreasonable delay, the court may refuse to grant the injunction on the grounds of laches.
  • Public Interest: The court will consider the wider public interest when deciding whether to grant a perpetual injunction. If granting the injunction would adversely affect the public or go against public policy, the court may refuse the application.

Applications of Perpetual Injunctions

Perpetual injunctions can be applied in a variety of legal contexts, including but not limited to property disputes, intellectual property rights, contractual obligations, and environmental protection. Below are some of the common scenarios where perpetual injunctions are sought and granted.

Property Disputes

In property law, perpetual injunctions are often used to prevent trespass or nuisance. For instance, if a neighbouring landowner constructs a building that encroaches on the claimant’s land, the court may grant a perpetual injunction ordering the removal of the encroachment and prohibiting any further trespass. Similarly, in cases of nuisance, such as excessive noise or pollution, a perpetual injunction can be issued to cease the offending activity permanently.

Intellectual Property Rights

Perpetual injunctions play a critical role in the enforcement of intellectual property rights. In cases of copyright infringement, trademark violation, or patent infringement, the court may grant a perpetual injunction to prevent the defendant from continuing the infringing activities. This serves to protect the intellectual property holder’s exclusive rights and prevent further economic harm.

Contractual Obligations

In contractual disputes, a perpetual injunction may be sought to enforce specific performance or prevent a breach of contract. For example, if a party to a contract threatens to disclose confidential information in violation of a non-disclosure agreement, the court may issue a perpetual injunction to prevent the disclosure. This ensures that the contractual obligations are upheld and the interests of the parties are protected.

Environmental Protection

Perpetual injunctions are also utilised in environmental law to prevent ongoing or future harm to the environment. For example, if a company is found to be discharging pollutants into a river in violation of environmental regulations, the court may grant a perpetual injunction prohibiting the company from continuing the discharge. This helps to protect natural resources and public health.

Procedure for Obtaining a Perpetual Injunction

The process of obtaining a perpetual injunction involves several steps, starting with the filing of a claim and culminating in a trial where the merits of the case are fully examined. The following is an outline of the typical procedure.

Filing a Claim

The claimant must file a claim form and particulars of the claim with the court, setting out the facts and legal basis for seeking a perpetual injunction. The claim must specify the relief sought and the grounds on which the injunction is requested.

Interim Injunctions

In some cases, the claimant may seek an interim (temporary) injunction to provide immediate relief pending the outcome of the trial. An interim injunction is granted based on a preliminary assessment of the case and is designed to preserve the status quo and prevent irreparable harm during the litigation process.

Evidence and Discovery

Both parties will have the opportunity to present evidence and conduct discovery to support their respective positions. This may include witness statements, expert reports, and documentary evidence.


The case will proceed to trial, where the court will hear arguments from both parties and evaluate the evidence presented. The claimant must prove their case on the balance of probabilities, demonstrating that the criteria for granting a perpetual injunction are met.


After considering the evidence and legal arguments, the court will issue its judgment. If the court finds in favour of the claimant, it will grant a perpetual injunction, specifying the actions that the defendant must take or refrain from taking. The judgment will also outline any additional orders, such as costs or damages, if applicable.

Enforcement of Perpetual Injunctions

Once a perpetual injunction is granted, it is binding on the parties and enforceable by the court. If the defendant fails to comply with the terms of the injunction, the claimant can seek enforcement through various mechanisms, including:

Contempt of Court

Non-compliance with a perpetual injunction can result in contempt of court proceedings. The court has the power to impose penalties on the defendant for contempt, which may include fines, sequestration of assets, or imprisonment.

Damages for Breach

In addition to contempt proceedings, the claimant may seek damages for any losses suffered as a result of the defendant’s breach of the injunction. This provides further incentive for the defendant to adhere to the court’s order.

Case Law

The principles and application of perpetual injunctions have been shaped by numerous judicial decisions. The following are some notable cases that have contributed to the development of the law in this area.

American Cyanamid Co v Ethicon Ltd [1975] AC 396

This landmark case established the test for granting interim injunctions, which also informs the principles for perpetual injunctions. The House of Lords held that the court should consider whether there is a serious question to be tried, whether damages would be an adequate remedy, and where the balance of convenience lies. Although the case dealt with an interim injunction, the principles are relevant to the broader context of injunctions.

Shelfer v City of London Electric Lighting Co [1895] 1 Ch 287

In this case, the Court of Appeal guided the circumstances in which damages might be awarded instead of an injunction. The court identified four factors to consider: whether the injury to the claimant’s legal rights is small, whether it is capable of being estimated in money, whether it can be adequately compensated by a small money payment, and whether it would be oppressive to the defendant to grant an injunction.

Coventry v Lawrence [2014] UKSC 13

The Supreme Court revisited the principles established in Shelfer and emphasised that the courts should exercise flexibility and discretion when deciding whether to grant an injunction or award damages. The court reiterated that an injunction is a discretionary remedy and should not be granted automatically, even if the claimant has established a legal right.


Perpetual injunctions are a powerful and versatile remedy in the British legal system, providing lasting protection for a wide range of rights and interests. The courts apply a rigorous set of principles to ensure that perpetual injunctions are granted only when just and equitable. By balancing the interests of the parties and considering the wider public interest, the courts strive to achieve fair and reasonable outcomes in disputes.

The legal framework governing perpetual injunctions continues to evolve through judicial decisions and legislative developments. As such, practitioners and litigants must stay informed of the latest legal precedents and procedural requirements to effectively navigate this complex area of law. Whether in property disputes, intellectual property cases, contractual conflicts, or environmental protection, perpetual injunctions remain a crucial tool for achieving justice and maintaining the rule of law.

Perpetual Injunction FAQ'S

A perpetual injunction is a court order that permanently prohibits a party from engaging in a certain action or behavior.

A perpetual injunction can be granted when a party has been found to have engaged in wrongful conduct and there is a need to prevent future harm or damage.

A temporary injunction is a temporary court order that prohibits a party from engaging in certain conduct until a final decision is made in the case. A perpetual injunction, on the other hand, is a permanent court order.

To obtain a perpetual injunction, a party must file a lawsuit and prove to the court that the other party has engaged in wrongful conduct and that a perpetual injunction is necessary to prevent future harm.

In some cases, a perpetual injunction can be modified or lifted if there is a change in circumstances or if the party subject to the injunction can demonstrate that it is no longer necessary.

If a party violates a perpetual injunction, they can be held in contempt of court and face penalties such as fines or imprisonment.

Yes, a perpetual injunction can be enforced across state lines through the process of domestication, where the court order is recognized and enforced in another state.

Yes, a party subject to a perpetual injunction can appeal the court’s decision to grant the injunction.

Yes, perpetual injunctions are commonly used in business disputes to prevent parties from engaging in unfair competition, trade secret theft, or other wrongful conduct.

To defend against a perpetual injunction, a party can argue that the injunction is not necessary to prevent future harm or that the party did not engage in the wrongful conduct alleged.

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This site contains general legal information but does not constitute professional legal advice for your particular situation. Persuing this glossary does not create an attorney-client or legal adviser relationship. If you have specific questions, please consult a qualified attorney licensed in your jurisdiction.

This glossary post was last updated: 8th June 2024.

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