1) Women not originally belonging to a State/UT, but married to men who are permanent residents of the State/UT are eligible to apply for Domicile Certificate.
2) since your husband is resident in Tamil Nadu for 7 years you can obtain domicile certificate
3) you are required to Collect the application form either online or from the local authorities, such as the Sub-Divisional Magistrate or Tehsildar’s office or Revenue Department or District Collector’s Office, or any other authority as specified in Tamil Nadu state. After that you need to fill the form completely and submit with required documents list along with it. Then you will be required to produce the residence proof of Tamil Nadu State for a specified period of time.
4) mportant Documents Required:
Permanently residence Proof (minimum 5 years)
Copy of Ration Card, Voter id card, Sale Deed, Tax Receipt, etc.,
School Leaving Certificate