Under Article 8 of the Saudi Civil Transactions Law, your legal domicile is your place of habitual residence — in practice, the address where you regularly live. Importantly, the law explicitly allows a person to have more than one domicile at the same time, which is particularly relevant for expats who split time between Saudi Arabia and their home country or another jurisdiction.
If you do not have a clear habitual residence, your domicile defaults to the place where you are currently present. Additionally, Article 9 specifies that the place where you carry out your trade or profession is treated as your domicile for all matters relating to that business activity. So if you operate a business in Riyadh but live in Jeddah, both locations could function as your domicile in different legal contexts.
For expats, your domicile matters for determining which court has jurisdiction over civil disputes, where legal notices must be sent, and how certain obligations are calculated. If you want to designate a specific address for a particular contract or transaction, Article 11 allows you to formally elect a domicile for that act. It is advisable to do this clearly in writing when signing significant agreements to avoid jurisdictional ambiguity later.
This is general legal information, not legal advice. For advice on your specific situation, consult a lawyer licensed in Saudi Arabia.