I Received a Notice of Unlawful Detainer in the Mail — What Does This Mean?
If you have received a Notice of Unlawful Detainer in the mail it means that your landlord has filed an eviction lawsuit against you in the Superior Court. The Notice of Unlawful Detainer is not the Unlawful Detainer Summons itself — it is a courtesy notice sent to you by the Court Clerk by regular mail to inform you that an Unlawful Detainer Complaint has been filed against you in the Superior Court. The Notice of Unlawful Detainer is typically one page in length and includes the name and address of the courthouse where the eviction lawsuit was filed, the names of the parties to the case, and the case number assigned by the Court. The Notice of Unlawful Detainer is accompanied by a one or two page Clerk's Certificate of Mailing signed by the Court Clerk.
It is critically important that you understand that receiving a Notice of Unlawful Detainer in the mail does not begin your deadline for filing a responsive pleading with the Court. Your deadline for filing a responsive pleading begins only after a process server has personally served you with the Unlawful Detainer Summons and Complaint. However, receipt of a Notice of Unlawful Detainer is an urgent warning that your landlord has initiated eviction proceedings against you and that a process server may attempt to serve you with the Unlawful Detainer Summons at any time.
What Should You Do After Receiving a Notice of Unlawful Detainer?
Step 1 — Do Not Ignore the Notice
Many tenants who receive a Notice of Unlawful Detainer in the mail make the critical mistake of assuming that because they have not yet been personally served with the Unlawful Detainer Summons they have ample time before they need to take action. This assumption can be devastating. A process server may attempt to serve you with the Unlawful Detainer Summons within days of the Notice of Unlawful Detainer being sent to you by the Court. If a process server makes multiple unsuccessful attempts to personally serve you with the Unlawful Detainer Summons the landlord may petition the Court for permission to serve the Unlawful Detainer Summons by posting it to the entrance of your residence and mailing it to you by USPS Certified Mail pursuant to CCP § 415.45. If this occurs your deadline for filing a responsive pleading will begin running without the Unlawful Detainer Summons ever having been handed to you directly.
Step 2 — Go to the Courthouse and Obtain a Copy of the Unlawful Detainer Complaint
The Notice of Unlawful Detainer identifies the courthouse where your eviction case was filed. You should visit the civil filing window at that courthouse as soon as possible and present the Notice of Unlawful Detainer to the Court Clerk and ask for a copy of the Unlawful Detainer Complaint. The Court Clerk will locate your case using your name, address, or the case number identified on the Notice of Unlawful Detainer and provide you with a copy of the Unlawful Detainer Complaint. Having a copy of the Unlawful Detainer Complaint in your possession before you are formally served with the Unlawful Detainer Summons allows you to begin preparing your responsive pleading in advance so that you are not scrambling to file within your deadline after service is effected on you.
Step 3 — Consider Filing Your Responsive Pleading Before Being Formally Served
California law does not require a tenant to wait until they have been formally served with the Unlawful Detainer Summons before filing a responsive pleading with the Court. A tenant may file their responsive pleading at any time after the Unlawful Detainer Complaint has been filed with the Court. Filing a responsive pleading before being formally served has several important advantages.
First, it protects you in the event that a process server inaccurately claims to have effected service of the Unlawful Detainer Summons on you when in fact they did not, or claims an incorrect date for when service was effected. If a process server files an inaccurate Proof of Service and the landlord relies on that inaccurate Proof of Service to file a Request for Entry of Default Judgment against you before you had an opportunity to file your responsive pleading, the landlord's Request for Entry of Default Judgment will be denied by the Court Clerk if your responsive pleading has already been filed.
Second, filing your responsive pleading before being formally served provides you with additional time to prepare a more thorough and comprehensive responsive pleading since you are not subject to any filing deadline until service of the Unlawful Detainer Summons is formally effected on you.
It should be noted that obtaining a copy of the Unlawful Detainer Complaint from the Court Clerk does not constitute formal service of the Unlawful Detainer Summons on the tenant, and does not begin the tenant's deadline for filing a responsive pleading. CCP § 1011
Step 4 — Review the Unlawful Detainer Complaint Carefully
Once you have obtained a copy of the Unlawful Detainer Complaint review it carefully. The Unlawful Detainer Complaint will identify the grounds upon which your landlord is seeking to evict you. Common grounds for eviction include nonpayment of rent, violation of the lease, nuisance, and expiration of the tenancy. The Unlawful Detainer Complaint will also include copies of the notice served on you prior to the filing of the lawsuit, such as a Three Day Notice to Pay Rent or Quit, a Three Day Notice to Perform Covenant or Quit, or a 30-Day or 60-Day Notice to Quit. Reviewing the allegations in the Unlawful Detainer Complaint and the notices attached as exhibits will allow you to assess whether any defenses are available to you and to prepare the strongest possible responsive pleading.
Step 5 — Call Tenant Eviction Defense Immediately
Receiving a Notice of Unlawful Detainer in the mail means that eviction proceedings against you are already underway. Every day that passes without action brings you closer to your filing deadline. Tenant Eviction Defense is an IRS 501(c)(3) nonprofit organization dedicated to helping Southern California tenants navigate the unlawful detainer process. Our staff is available to discuss your situation, help you understand your rights and options, and assist you in understanding the steps necessary to protect yourself from a default judgment for eviction being entered against you.
Call our Eviction Defense Rapid Response Line immediately at (657) 510-6534, Monday through Friday from 8:30 a.m. to 6:00 p.m. Do not wait until a process server arrives at your door. The time to act is now.
Updated April 11, 2026.