What is the process for extending a Non-B visa in Thailand?

The process for extending a Non-B visa starts with submitting an application at a Thai immigration office at least 7 days before your current permission to stay expires, bringing your passport, TM30, photos, and proof of the reason you need the extension.

The Specifics

• You must apply in person at the immigration office that has jurisdiction over your address.
• The application is normally filed on Form TM.7.
• Supporting documents usually include a letter from your employer explaining why the extension is needed, company documents, and evidence that you meet any financial or work conditions attached to the Non-B category.
• Processing normally takes the same day if the file is complete, but you should plan to be at immigration for 1–3 hours depending on how busy the office is that morning.
• The extension, when granted, is usually for another 90 days; you can repeat the process as long as the underlying reason for the Non-B remains valid.

Expert Tips from Thai Kru Visa Agency

Prepare every document in advance and double-check the exact list for your immigration office. Rules can vary slightly by province. Bring both originals and copies. A clean TM30 (Notification of Residence) is almost always required; we can obtain this for you without you visiting immigration if you prefer.

Book your appointment early if the office offers online booking. Arrive with cash for the 1,900 THB government fee. If your work or business situation has changed since the original visa was issued, bring updated proof so the officer can see the extension is still justified.

Many clients combine the extension with other routine tasks such as a 90-day report or residency certificate request on the same trip. Knowing exactly what order the counters expect saves time.

Read our guide on the general process for extending any visa in Thailand and our post on how much time you actually need to spend at immigration for more practical details.

If you would rather not handle the paperwork, queues, or Thai-language forms yourself, Thai Kru Visa Agency offers a full extension service. We prepare the file, book the slot where possible, and guide you through the visit so the day goes smoothly. Learn more about our Thailand Expat Immigration Services here.