What do I need for a 30-day extension at the immigration office in Thailand?

This is the latest information.

Some offices are using their own forms that are not available on internet (for example, Bangkok is using the one with additional stamped fields) and some of offices don't accept downloaded ones. In that case, you have to fill out them at the office again anyway.

The forms to fill out are as follows:

- TM.7

- STM.2

- TM.30

Also depending on what immigration office you visit some of them also require you to complete a Penalties for Overstay form.

These forms can be found online, printed and filled out to take with you before you go or they will have them at the immigration office for you to fill out once you get there, so take a pen with you.

Note: The TM.30 needs to be filled out by your landlord or the owner of your accommodation. You will have to ask them to complete this beforehand. Essentially they register you into the system online and then you will need to get a printed copy of it from them once they've completed it. They can also send you a screenshot for you to print out if that's easier.

Other than that you need a copy of your main passport page, a copy of your passport entry stamp/visa page, one 4cm x 6cm passport photo, 1,900 baht cash and your physical passport. Patience is also required at many immigration offices as there can be long wait times and it can be a bit frustrating but it's not too bad if you're organised and polite. The staff will generally help you out if you're not rude.

With regards to your address being in Thai, maybe try and take a screenshot then go into Google translate and ask it to translate your screenshot. Good luck!