Assuming your separation agreement or court order explicitly provides that the house that your ex-spouse is currently in is distributed to you as your sole and separate property and the terms are final and binding, then you can change the locks and file either a breach of contract lawsuit or a contempt motion.
If the terms are in a separation agreement, the separation agreement is final and binding if both parties have signed it and both signatures are notarized. For a separation agreement, you would file a breach of contract lawsuit.
If the terms are in a court order, the court order is final in binding if the judge has signed it and it has been file stamped at the clerk’s office. For a court order, you would file a contempt motion (called a motion for order to appear and show cause).
It is better to change the locks and/or file a lawsuit/motion rather than turn off all utilities, however, if the above assumptions are true, then it would be fine to turn off the utilities.
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