I'm going to be visiting Thailand for 5 weeks. I was hoping to arrive on a visa exemption and then hop over the border to get the extra week that I need. Now that I've worked out an itinerary, it looks like this option is not going to be possible.

I understand that I can get a 7 day visa extension and I just have some questions about it:

1) When should I go to the immigration office to apply for it? (i.e. could I go a week before I have to leave on the original stamp? or do I need to go within a couple of days before it runs out?)

2) What form do I need to use to apply for it?

3) Can I do this at the immigration office on Koh Samui.

Thanks for your help in advance!

You need a Visa for a stay over 30 days.

Without one or a flight ticket leaving Thailand within 30 days you may be refused entry to the flight.

If you do manage to make it there is no 7 day extension as such.

There is 7 days to allow you to sort things out and get out of town.

1,900 baht. TM7 form. They will need to see your flight ticket leaving within 7 days.

The 7 days will start from the day you apply.