To file a nuisance complaint against a neighbor in New Jersey, you should follow these key steps:

1. Understand Local Ordinances
   Begin by reviewing your municipality’s local ordinances related to noise, property boundaries, pet control, or other relevant nuisance issues. These laws define what is legally acceptable and form the basis for your complaint.

2. Attempt Direct Communication
   Try to resolve the issue amicably by talking to your neighbor in a calm and respectful manner. Explain how their behavior affects you and suggest reasonable solutions. This step can often prevent escalation.

3. Consider Mediation
   If direct communication fails, New Jersey offers community mediation services where an impartial third party helps neighbors reach a voluntary agreement. Mediation is cost-effective and can preserve neighborly relations.

4. File a Formal Legal Notice
   If mediation is unsuccessful, send a formal legal notice to your neighbor outlining the nuisance, the laws they may be violating, and the actions required to resolve the issue. It is advisable to have an attorney draft this letter to ensure it is legally sound and taken seriously.

5. Report to Authorities
   For noise complaints, you can contact your local police department or municipal code enforcement. Some municipalities have certified personnel to measure noise levels. The New Jersey Noise Control Act sets decibel standards that, if exceeded, constitute a violation.

6. File a Lawsuit if Necessary
   As a last resort, you can file a private nuisance lawsuit in Superior Court. You must prove that your neighbor’s actions unreasonably interfere with your use and enjoyment of your property. Evidence such as noise recordings, police reports, witness statements, and logs documenting the nuisance are crucial. It helps if other neighbors also support your complaint.

7. Seek Remedies
   In court, you can seek monetary damages or an injunction to stop the nuisance. Small claims court is an option for less severe cases, with limits on compensation amounts. Consulting an attorney can help you navigate the process effectively.

In summary, start with understanding local laws and communicating with your neighbor, then escalate through mediation, formal notices, and finally legal action if necessary. Documentation and evidence are key throughout the process to support your complaint.