If you have to present evidence to the Court, then you will need a proper appraisal and the appraiser expert to testify about the findings. If there is a possibility of settling, then the Zillow guestimate may be satisfactory, but not as proper evidence before the Court.
The answer provided is a general response based upon information contained in the query which has not been substantiated or otherwise verified. For complete advice particular to your individual situation, you should consult with an attorney in your local area that is well versed in family law.
Zillow can be way off depending on recent comparables (sold, pendings, active) and also unique property characteristics. If you do not want to pay for an appraisal (typically $350 or more) a realtors written opinion through a CMA including similar comparables may be adequate enough but the Judge will likely require an appraisal.
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I don't find Zillow or appraisal very accurate. If you need a really accurate value, use a licensed appraiser.
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In order for facts to be admitted into evidence in a family law case a live person with expertise must be able to recite their skills and training, valuation analysis methodology, and expert opinion. They must be present in court to be examined, cross-examined and queried by the judge. An appraiser or real estate agent are qualified to offer this testimony.