If you want to remain in Thailand past your initial stay, you must apply for a Visa Extension.
This is the Immigration Bureaus Official Visa Extension website and it outlines all the requirements and documents to apply for a Visa Extension.
Item # 4 is the Visa Extension for Tourists:
Criteria for Consideration
The alien:
- Must have been granted a tourist visa (TOURIST)
- Must not be of a nationality or type prescribed by the committee monitoring official
proceedings of officers of the Immigration Bureau.
In case of the following nationalities, extension of stay permit will not be longer than 7 days:- Sri Lanka
- India
- Pakistan
- Bangladesh
- Iran
- Nepal
- Togo
- Nigeria
- Uganda
Documents to be submitted
- Application form TM.7 (application must be made in person)
- Copy of applicant’s passport
- Photo 4 x 6 cm. (not older than 6 months)
- Application fee 1,900 Baht.
Document For Case :
In the case of receiving medical treatment :
- Application form TM. 7 (application must be made in person)
- Copy of applicant’s passport
- Letter of confirmation and request for a temporary stay issued by a physician of the hospital providing said treatment
In the case of attending rehabilitation or taking care of a patient :
- Application form TM. 7 (application must be made in person)
- Copy of applicant’s passport
In the case of taking care of a patient, the applicant must attach a letter of confirmation and request for a temporary stay issued by a physician of the hospital providing said treatment and document stating relationship (in the case that the caretaker is a member of the family), such as a marriage certificate, a birth certificate, registration of child legitimization, child adoption registration certificate, or confirmation letter from the embassy or consulate.
In the case of a person who used to have Thai nationality or whose parent is or was of Thai nationality visiting relatives or returning to his or her original homeland :
- Application form TM. 7 (application must be made in person)
- Copy of applicant’s passport
- Copy of documents proving that the applicant used to have Thai nationality or that hit/her parent is or was of Thai nationality.
In the case of visiting a spouse or children who are of Thai nationality
- Application form TM. 7 (application must be made in person)
- Copy of applicant’s passport
- Documents of relationship
3.1 Copy of household registration certificate
3.2 Copy of national ID card of the person having Thai nationality
3.3 Copy of a marriage certificate or copy of a birth certificate
In the case of litigation or court proceedings :
- Application form TM. 7 (application must be made in person)
- Copy of applicant’s passport
- Confirmation letter from an inquiry official involved with the case, official paper or document confirming that the applicant is being involved with the litigation or court proceedings of the case.
In the case of performing duties or missions for a government agency, state enterprise, other government agency or embassy or consulate or international organization :
- Application form TM. 7 (application must be made in person)
- Copy of applicant’s passport
- Letter of confirmation and request for a temporary stay issued by a government agency of the departmental level or equivalent; the head of a state enterprise; the head of another government agency; or a police officer of a level equivalent to or higher than the divisional level; or a military officer of a command unit under the Ministry of Defense, Royal Thai Armed Forces Headquarters, Royal Thai Army, Royal Thai Navy, or Royal Thai Air Force, who is a Major General, Rear Admiral, Air Vice Marshal, or officer of a higher ranking; or by an international organization.
In the case of necessity, with certification or request made by an embassy or consulate :
- Application form TM. 7 (application must be made in person)
- Copy of applicant’s passport
- Letter of confirmation and request for a temporary stay from the embassy and consulate in Thailand
- Only in the case of training, the applicant must have been granted a work permit.