A custody modification case is a lawsuit in which a party asks the court to rearrange the custody arrangement set in a divorce decree, in the child's best interest, because of a substantial change that arose afterward. The case is filed by submitting a petition to the competent Family Court. Custody is the set of rights and obligations granted to parents under the Turkish Civil Code (TMK) concerning the child's care, education, representation and protection. This guide summarizes the requirements and process of the case, as well as the right to personal contact with the child, for general informational purposes; you should consult a lawyer about your specific situation.
Can I take custody away from my ex-spouse after the divorce?
In the divorce decree, the judge grants custody to the mother or the father with the child's best interest in mind. This decision is not final; if circumstances change, the court may rearrange custody. Under TMK Art. 183, if there is a significant change in the circumstances of the party who holds custody, the judge may make a new arrangement that serves the child's interests.
The following kinds of situations are commonly cited as grounds for modifying custody:
- The custodial parent fails to provide adequate care and attention to the child
- Behavior that endangers the child's health, safety or moral development
- Serious illness, addiction or prolonged absence of the custodial parent
- Allegations of neglect, violence or abuse toward the child
- The custodial parent attempting to alienate the child from the other parent
- Changes over time in the child's age and needs
In most cases, a parent's better financial situation alone is not considered sufficient for a change of custody.
What conditions are required for a custody modification?
The court examines two main points: whether a new circumstance has arisen and whether the change is in the child's best interest.
Proving the new circumstance
The plaintiff must prove that a substantial change has occurred since the custody decision. Facts that were already known before the decision are not sufficient on their own. The change must adversely affect the custodial parent's ability to care for the child or the child's developmental environment.
How is the child's best interest assessed in court?
The child's best interest is a fundamental principle of the United Nations Convention on the Rights of the Child (Art. 3) and of Turkish law. In assessing this principle, the judge generally looks at the following criteria:
- The child's age, gender and stage of development
- The nature of the child's bond with the mother and father
- The continuity of the current living arrangement (school, surroundings, friends)
- The parents' capacity to provide care and their living conditions
- The child's own views, heard to the extent that age and maturity allow
The importance of maternal care for young children is often emphasized; however, this is not an absolute rule, and each case is evaluated under its own circumstances.
The petition, competent court and documents
The competent court is the Family Court; in places where there is no family court, the civil court of first instance hears the case in the capacity of a family court. Since the law contains no jurisdiction rule specific to custody modification, the Court of Cassation treats this request as a non-contentious matter and, under HMK Art. 384, accepts the court of the residence of the plaintiff or of one of the interested parties (for example, the defendant parent) as competent; this jurisdiction is not exclusive. The petition should include the following elements:

- Identity details of the parties and the child
- The date and court of the previous custody decision
- A concrete account of the new circumstance that arose after the custody decision
- Why the change is in the child's best interest
- A list of evidence and the relief requested
Documents usually required: the divorce decree with its finalization annotation, a civil registry record, a certificate of residence, a receipt for court fees and expense advance, and a power of attorney if the case is filed through an attorney.
What evidence should I gather for a custody modification?
The burden of proof mostly lies with the plaintiff. It is important that evidence be obtained by lawful means. Commonly used evidence includes:
- Witness statements (neighbors, teachers, relatives)
- School absence records and counseling service opinions
- Medical reports and hospital records
- Law enforcement or prosecutor's office records and protective orders, if any
- Correspondence and message records (if lawfully obtained)
- If necessary, a request for an expert opinion and a social investigation report
How do I request an injunction and temporary custody arrangement?
If there is a risk of harm to the child while the case is ongoing, temporary custody or an injunction can be requested in the petition. Relying on the Code of Civil Procedure and the provisions of the TMK, the judge may take the temporary measures deemed necessary to protect the child. Demonstrating an urgent risk with concrete evidence increases the likelihood that the request will be granted. Whether to issue the order is entirely at the judge's discretion.
What can I do if my ex-spouse prevents me from seeing the child?
The right to personal contact with the child is the right of the non-custodial parent to meet regularly with the child, spend time together and communicate (TMK Art. 323). This right also belongs to the child and can be restricted only if the child's interests are seriously endangered.

If contact is being obstructed, the following steps can be taken in order:
- Documenting the incidents of obstruction with dates and witnesses
- Applying to the Family Court to detail or modify the personal contact arrangement
- If the personal contact decision is not voluntarily complied with, applying to the Judicial Support and Victim Services Directorate where the child is located to have the decision enforced; enforcement of these decisions was removed from the enforcement offices by Law No. 7343 and is now carried out under Articles 41/A et seq. of the Child Protection Law No. 5395
- If the obstruction becomes persistent, raising a request for modification of custody
Conduct aimed at alienating the child from the other parent may be taken into account by courts as a negative factor in the custody assessment.
How does the trial process work, how long does it take, and what does it cost?
After the petition is filed, the court summons the parties, a response petition is received, and a preliminary examination is held. Evidence is then collected. In most cases, Family Courts have a social investigation report prepared by an expert pedagogue, psychologist or social worker. These experts, who work within the court, give their opinion after examining the parties' living conditions, their relationships with the child and the child's developmental state. The report does not bind the judge; however, it carries significant weight in the decision, and the parties may submit their statements and objections to the report.
A child of the age of discernment is heard by the court in a case that concerns them, and their views are taken into account in proportion to their age and maturity; the Court of Cassation treats a custody ruling issued without hearing a child of the age of discernment as grounds for reversal. The child is generally heard in the presence of an expert and in an environment where the parties are not present. During the proceedings, the judge may also issue temporary (interim) orders on custody or personal contact if deemed necessary.
The duration of the case varies depending on the court's workload, the preparation of the social investigation report, the hearing of witnesses and the appeal stages; therefore it is not possible to give an exact timeframe. Litigation costs (court fees, expense advances, witness and expert fees) also differ depending on the scope of the case. The decision can be appealed through the regional court of appeal (istinaf).
Frequently Asked Questions
How is a custody modification case filed?
A custody modification case is filed by submitting a petition to the family court (or, where none exists, to the civil court of first instance acting as a family court). Under Court of Cassation practice, the court of the residence of the plaintiff or of one of the interested parties (for example, the defendant parent) is competent; the necessary documents and evidence are attached to the petition.
What conditions are required for a custody modification?
It must be demonstrated with concrete evidence that a substantial change has occurred since the custody decision and that modifying custody is in the child's best interest. The child's age and, if of the age of discernment, their views as heard are also taken into account.
How long does a custody modification case take?
It is not possible to give an exact timeframe. The duration varies depending on the court's workload, the preparation of the social investigation report, the collection of evidence and the appeal stages.
What is the right to personal contact with the child?
The right to personal contact with the child is the right of the parent who has not been granted custody to meet and communicate with the child on a regular basis (TMK Art. 323). If custody is changed, this right is rearranged in favor of the parent who lost custody; its scope is determined with regard to the child's best interest.
What documents are required in a custody modification case?
Generally, the divorce decree with its finalization annotation, a civil registry record, a certificate of residence, a power of attorney if the case is filed through an attorney, and evidence showing the new circumstance that necessitates the custody modification are submitted.