Fill out this order form completely (except for the judge's signature). To modify a divorce decree in Texas, you must demonstrate a material and substantial change in circumstances.In general, Texas has very few official legal forms. This is why you will not always find a free fill-in-the-blank form for your situation. You have 30 days from the date the judge sign the final decree of divorce to ask the court to reopen the case. If you want to amend divorce decree provisions down the road, you can file a motion to modify divorce decree under certain circumstances. The cost of modifying a divorce decree can vary widely based on several factors, including the complexity of the changes, legal fees, and additional costs. These fees are typically required when submitting the initial paperwork to request a modification. 4. Are you divorced but need to modify your Final Decree of Divorce for your children? You have two years from the date of the final decree to file for enforcement of property division.