Not every separation starts with someone moving out. Many people remain in the same home because of children, finances, safety, housing pressure or the time needed to plan properly.
The quick answer is that you can be separated while still living under one roof. For divorce, you must show that the marriage has broken down irretrievably and that you have been separated for at least 12 months. If some or all of that separation happened in the same home, you may need extra evidence explaining how your relationship changed.
What separation means
Australian divorce law is no-fault. The Court does not decide who caused the relationship to end. The key legal question for divorce is whether there has been an irretrievable breakdown of the marriage, shown by 12 months of separation: Family Law Act 1975 (Cth) s 48.
Separation has two parts. One or both people form the intention to end the relationship, and that intention is communicated or made clear by conduct. Physical separation is common, but it is not essential.
This means a couple can separate while sharing an address. The Court will look at what actually changed in the relationship, not only where each person slept.
Why people remain under one roof
Separated under one roof is common. People may stay in the same home because rent is expensive, the family home has not been sold, children need stability, one person has nowhere safe to go, or a property settlement is still being worked through.
Remaining in the same home does not, by itself, mean separation has not occurred. The question is whether the marital or de facto relationship has ended in a practical sense.
However, because the address did not change, the Court may need more information if you later apply for divorce.
Evidence that may support separation under one roof
Useful evidence may include changes to sleeping arrangements, finances, household tasks, social life, communication with family and friends, Centrelink or tax records, school records, messages confirming the separation, and evidence that the parties stopped presenting themselves as a couple.
The Court does not require every possible change. Some separated people still share tasks because of children or finances. The point is to explain the overall change clearly and honestly.
If you apply for divorce and the whole or part of the 12-month separation period was under one roof, affidavit evidence may be required. A supporting affidavit from another person who knows about the separation may also be needed.
Separation is different from divorce
Separation is the practical end of the relationship. Divorce is the legal end of a marriage. Property settlement, parenting arrangements and child support are separate issues again.
You do not need to be divorced before dealing with parenting or property matters. Many people need advice about property, parenting, safety or financial support long before they can apply for divorce.
There are also time limits to keep in mind. For married couples, an application for property settlement or spousal maintenance should usually be filed within 12 months after a divorce order takes effect. For de facto couples, the usual time limit is two years after separation.
What to do early
If you are separated but still in the same home, record the date of separation and the main changes that happened from that date. Keep copies of important documents. Think carefully before making large financial decisions, moving money, changing locks, cancelling services or making informal parenting arrangements.
If there are safety concerns, get urgent advice. Family violence, intimidation, financial control or threats can change what steps are appropriate.
A short conversation with a family lawyer can help you understand whether you should focus first on parenting, property, divorce, safety or practical separation arrangements.
The next step
Living together after separation does not stop you from moving forward, but it does make clarity and records important. The safer path is to understand your rights before informal arrangements become difficult to unwind.