Define: Interested Party

Interested Party
Interested Party
Quick Summary of Interested Party

An interested party refers to an individual or group that holds a vested interest in a particular matter or transaction. This implies that they have a discernible interest in the final result of the situation. For instance, in the event of a company sale, the employees of that company are considered interested parties as the sale could potentially impact their employment. Similarly, shareholders in a company are also interested parties, as they possess a financial stake in the company’s success and therefore have a vested interest in any decisions made by the company. In summary, an interested party is an individual or group with a vested interest in a situation and may be influenced by the outcome.

What is the dictionary definition of Interested Party?
Dictionary Definition of Interested Party

An interested party refers to someone who has a vested interest in a particular matter or event. For instance, in a court case, the individuals directly involved in the case are considered interested parties. It is crucial to ensure the inclusion of all interested parties in a case to ensure that their perspectives and requirements are acknowledged and considered.

Full Definition Of Interested Party

In the realm of law, the term “interested party” holds significant weight, particularly in legal proceedings and administrative actions. An interested party, also known as an intervener or participant, refers to any individual or entity with a stake in the outcome of a legal case or administrative decision. This overview delves into the definition, rights, obligations, and implications for interested parties within the context of British law, drawing on examples from various legal areas such as civil litigation, judicial review, and administrative law.

Definition and Scope

An interested party is generally defined as a person or entity whose rights, interests, or duties could be directly affected by the outcome of a legal proceeding or administrative action. The scope of who qualifies as an interested party can vary depending on the specific legal context. In civil litigation, an interested party might be a third party who is not directly involved in the litigation but has a vested interest in its outcome. In judicial review, an interested party typically includes those who are directly affected by a public body’s decision or action.

Rights of Interested Parties

Civil Litigation

In civil litigation, interested parties have the right to apply for permission to intervene in proceedings. Under the Civil Procedure Rules (CPR), particularly Part 19, third parties who have a sufficient interest in the proceedings can seek to be joined as interested parties. The court assesses the sufficiency of the interest based on the facts of each case. An interested party, once joined, may have the right to make submissions, present evidence, and participate in hearings.

Judicial Review

In the context of judicial review, interested parties play a crucial role. According to the Administrative Court Judicial Review Guide, an interested party is someone directly affected by the decision being challenged. These parties are typically named in the claim form, and they have the right to be heard in proceedings. They can file evidence, make submissions, and attend hearings. Their participation ensures that the court hears all relevant perspectives before making a decision.

Administrative Law

In administrative law, interested parties often have rights under specific statutes or regulations. For instance, in planning law, neighbouring property owners might be considered interested parties when a planning application is made. They have the right to be notified of the application, to make representations, and, in some cases, to appeal against decisions.

Obligations of Interested Parties

While interested parties have rights, they also bear certain obligations. These obligations ensure the fairness and efficiency of legal proceedings.

Duty of Disclosure

Interested parties may be required to disclose relevant information. This obligation aligns with the overarching duty of candour in judicial review, which mandates that all parties provide full and frank disclosure of all relevant facts. Failure to do so can result in adverse consequences, including the dismissal of the intervention or other sanctions.

Adherence to Procedural Rules

Interested parties must adhere to procedural rules governing their participation. In civil litigation, for example, they must comply with the timelines and procedures outlined in the CPR. Similarly, in judicial review, interested parties must follow the procedures set out in the Administrative Court Judicial Review Guide. This includes filing submissions and evidence within specified deadlines.

Contribution to Costs

Courts may require interested parties to contribute to costs. In judicial review, the court has discretion to make costs orders against interested parties, particularly if their intervention has caused additional expense. However, the court also recognises the public interest in allowing affected parties to participate, and costs orders are typically made with a view to balancing these interests.

Examples of Interested Parties in Various Legal Contexts

Planning Law

In planning law, interested parties often include neighbouring property owners and local residents. When a planning application is submitted, local planning authorities are required to notify those who might be affected. These interested parties can then submit objections or support for the application. Their views are taken into account by the planning authority when making a decision. For example, in the case of a controversial development, local residents might object on grounds of increased traffic or environmental impact, while the developer and supporters might argue the benefits of economic development and job creation.

Environmental Law

Environmental law frequently involves interested parties, especially in cases concerning public health and environmental protection. Non-governmental organisations (NGOs), community groups, and individuals may seek to intervene in legal proceedings to protect environmental interests. For instance, in a case involving the approval of a new industrial project, an environmental NGO might intervene to argue against the project due to its potential impact on local ecosystems. The court would consider their submissions alongside those of the primary parties.

Family Law

In family law, interested parties might include extended family members or guardians. For example, in cases involving child custody, grandparents or other relatives might seek to intervene if they believe they have a significant interest in the child’s welfare. The court assesses their involvement based on the best interests of the child, ensuring that all relevant perspectives are considered before making a decision.

Implications for Legal Practice

The concept of an interested party has several implications for legal practice, particularly in terms of case management, advocacy, and strategic planning.

Case Management

Lawyers representing interested parties must be adept at managing complex cases with multiple participants. This involves coordinating with other parties, ensuring compliance with procedural rules, and effectively presenting their client’s interests. Effective case management is crucial to avoid delays and ensure the smooth progression of proceedings.


Advocates representing interested parties must be persuasive in demonstrating their client’s interest and the relevance of their participation. This often involves detailed legal and factual analysis to establish the sufficiency of their interest. Advocates must also be prepared to respond to objections from other parties who might challenge their involvement.

Strategic Considerations

For primary parties in litigation or judicial review, the presence of interested parties can significantly impact case strategy. Primary parties must anticipate the arguments and evidence that interested parties might present, and they may need to adjust their own strategy accordingly. This might involve negotiating with interested parties to narrow issues or seeking to exclude those whose participation might be detrimental.

Judicial Perspectives on Interested Parties

The judiciary plays a critical role in determining the involvement of interested parties. Courts must balance the need for comprehensive consideration of all relevant perspectives with the need to avoid unnecessary complexity and delay in proceedings.

Criteria for Inclusion

Judges have developed criteria for determining whether an individual or entity qualifies as an interested party. These criteria include the directness of the interest, the potential impact of the outcome on the party, and the relevance of their participation to the issues at hand. For example, in R v Secretary of State for Foreign and Commonwealth Affairs, ex parte World Development Movement Ltd, the court considered the sufficiency of the NGO’s interest in challenging a government decision on grounds of public interest and expertise.

Managing Participation

Courts also manage the participation of interested parties to ensure proceedings remain efficient and focused. This might involve setting limits on the length of submissions, restricting the scope of evidence, and imposing deadlines. Judges have wide discretion in this regard, guided by principles of fairness and justice.


The concept of an interested party is integral to ensuring that legal proceedings and administrative actions are fair and comprehensive. Interested parties provide valuable perspectives that might otherwise be overlooked, contributing to more informed and balanced decision-making. However, their involvement also introduces complexity, requiring careful management by courts and legal practitioners. By understanding the rights, obligations, and strategic implications associated with interested parties, lawyers can better navigate the legal landscape and effectively advocate for their clients’ interests.

In British law, the role of interested parties continues to evolve, shaped by judicial interpretation and legislative developments. As legal issues become increasingly complex and multifaceted, the involvement of interested parties is likely to remain a crucial aspect of ensuring justice and fairness in legal and administrative processes.

Interested Party FAQ'S

An interested party is someone who has a direct interest in the outcome of a legal matter, such as a lawsuit or a contract negotiation.

An interested party has a direct stake in the legal matter at hand, while a third party may be involved in the matter but does not have a direct interest in the outcome.

Yes, an interested party can file a motion to intervene in a legal case if they believe that their interests are not being adequately represented by the existing parties.

An interested party has the right to be notified of any legal proceedings that may affect their interests and to participate in those proceedings.

Depending on the circumstances, an interested party may be held liable if their actions or decisions have contributed to the legal matter at hand.

A person or entity can become an interested party in a legal case by demonstrating that they have a direct and substantial interest in the outcome of the case.

An interested party in a contract negotiation is someone who stands to benefit or be affected by the terms of the contract, and they have the right to participate in the negotiation process.

Yes, an interested party can file an appeal or challenge a legal decision if they believe that their interests have not been adequately considered or if there are legal errors in the decision.

If an interested party is not properly notified of a legal proceeding, they may have grounds to challenge any decisions made in that proceeding.

An interested party has the right to represent themselves in a legal case, but it is often advisable to seek legal counsel to ensure that their interests are properly protected.

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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: 7th June 2024.

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