How do I correct errors in Los Angeles County Assessor property records?
For incorrect property characteristics, submit a Property Data Change Request (ASSR-129) to the Los Angeles County Assessor. First confirm the property and the detail you believe is wrong, then explain the requested correction. The form covers discrepancies such as building size, bedroom and bathroom counts, and number of units.
A mailing address change, an ownership question, and a disagreement about assessed value require different handling. If you are unsure which process applies, call the Assessor at 213-974-3211.
Independent information: This website is not affiliated with Los Angeles County. We do not accept correction requests, update County records, or decide assessments.
Confirm the Property and the Reported Error
Search the Assessor Portal by address or Assessor's Identification Number (AIN). Check that the record belongs to the correct parcel, especially for condominiums, multi-unit properties, or sites with several parcels.
Save the relevant property details and the date you viewed them. Identify the exact field in question and compare it with your records. For example, explain that the record shows a particular bedroom count and state the count you believe is correct.
If the discrepancy involves square footage, identify what is being measured. A figure for the main building may differ from one that includes a garage or another structure. Ask the Assessor to clarify the field before assuming that two different figures represent an error.
Choose the Correct Correction Process
| Issue | Where to start | Important distinction |
|---|---|---|
| Incorrect building size, room count, unit count, or other property characteristic | Property Data Change Request, form ASSR-129, in the Assessor's forms directory. | Describe the factual discrepancy and the proposed correction. |
| An outdated address for receiving tax bills and notices | Assessor mailing address change instructions. | A mailing address is different from the property's physical location. |
| An owner name or transfer appears incorrect or outdated | Contact the Assessor and ask for ownership assistance. | Explain whether the discrepancy is in the assessment record or in the recorded document itself. |
| You disagree with the assessed value | Assessment review and appeal guidance. | ASSR-129 is not intended for differences of opinion about value. |
For ownership or transfer questions, the Assessor's appointment page includes an Ownership Services option. If you need the underlying recorded document for comparison, see how to obtain a recorded deed copy.
Prepare a Clear Correction Request
Have the following information ready:
- Property identification: AIN and complete property address, including the unit number when applicable.
- Owner and contact details: The information requested by the form.
- Current entry: The detail presently shown in the Assessor's record.
- Requested correction: The information you believe should replace it.
- Explanation: Why you believe the entry is incorrect and when any relevant property change occurred.
Gather records that help explain the discrepancy, such as plans, permit or inspection records, measurements, or photographs, as relevant. Ask the reviewing office which documents it needs; these examples are not a universal attachment checklist.
For example, a size discrepancy is easier to review when you explain which structure and area the measurement covers. A listing description alone may not explain how a figure was calculated.
Submit the Request Through the Assessor
Open the Assessor's official forms directory and find ASSR-129, Property Data Change Request. Use the available download, online submission, and e-file instructions for that form.
An Assessor E-Services account supports online submission of this form. Follow the current account and submission instructions if you choose to e-file.
If you prefer a paper request, download the current ASSR-129 from the forms directory. Complete the applicable fields, review the declaration, and obtain the property owner's signature. Use the email or mailing instructions printed on that version of the form.
The form states that the Assessor may physically inspect the property to verify the requested change. Submission begins a review; it does not establish that the proposed correction has been accepted.
If you need help, call 213-974-3211 or use the district locator to identify the office assigned to the property. Check current office locations and services before visiting.
Keep Proof and Confirm the Outcome
Keep a copy of the completed request, supporting documents, submission date, and any confirmation or reference number. When following up, provide the AIN and describe the specific change requested.
Ask whether more information is needed, whether the request has been reviewed, and how you will be notified of the outcome. If a correction is approved, confirm which record was changed and when it should appear in the public Portal. An acknowledgment of receipt is not confirmation that the record has been corrected.
If the issue also affects an assessment notice or tax bill, ask separately whether an assessment adjustment is required and which tax years are involved. Do not assume that a property-detail correction automatically changes a bill or produces a refund.
If you intend to challenge assessed value, check the applicable appeal deadline while the correction request is pending. A correction inquiry does not replace a formal appeal or suspend property tax payment obligations.
For the Assessor's wider services, see our Los Angeles County Assessor page. Send correction requests and supporting records directly to the designated official service; documents submitted to this website do not reach the Assessor.